1. Spring MVC 概述

2.1 Spring MVC是什么

Spring web mvc是表现层的框架,它是Spring框架的一部分,我们可以从Spring的整体结构中看得出来：

1.0 Spring MVC处理流程

l 1）核心控制器：处理特定请求。（例如：以*.action为后缀）

名称：DispatcherServlet

配置：是一个servlet，需要在web.xml中配置。

XML：需要确定核心XML配置文件的位置

l 2）核心XML配置文件：确定Controller位置、确定JSP页面位置

名称：springmvc.xml

l 3）控制器：开发人员编写的主要内容

名称：*Controller

l 流程示意图

2. 入门案例：查询详情 ( xml）

3.1 需求说明

在index.html中点击 Hello SpringMVC 超链接，在 show01 .jsp 页面显示信息。

2.1 思路分析

整体思路:

跟HelloServlet入门案例几乎相同 .

服务器设置一个Controller,相当于之前的Servlet,可以接收请求,把请求在转发给jsp页面.

这里的区别就是需要设置web.xml和springmvc.xml两个配置文件,前者是用来配置核心控制器,后者是用来扫描我们自己书写的Controller的.

书写步骤:

1.拷贝pom文件,SpringMVC.xml文件和web.xml配置文件核心代码.

2.创建HelloController和show01.jsp

项目结构如下:

2.2 实现步骤

2.2.1 拷贝配置文件相关代码

获取pom文件:

参见当前文档末尾的附录 <SpringMVC01_pom>

获取springmvc.xml文件

代码如下直接拷贝

 
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
       xmlns:p="http://www.springframework.org/schema/p" 
       xmlns:context="http://www.springframework.org/schema/context" 
       xmlns:mvc="http://www.springframework.org/schema/mvc" 
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                  http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
                  http://www.springframework.org/schema/mvc
                  http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
                  http://www.springframework.org/schema/context
                  http://www.springframework.org/schema/context/spring-context-4.2.xsd"> 
    <!-- 扫描注解包 --> 
    <context:component-scan base-package="com.Maynor.controller" />  
</beans>

获取Web.xml代码配置如下:

 
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" 
         version="4.0">
 
  <display-name>Archetype Created Web Application</display-name>
 
 
  <!-- 设置核心配置器 -->  
  <servlet> 
    <servlet-name>springmvc</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
    <init-param> 
      <param-name>contextConfigLocation</param-name> 
      <param-value>classpath:springmvc.xml</param-value>  
    </init-param> 
  </servlet> 
  <servlet-mapping> 
    <servlet-name>springmvc</servlet-name> 
    <url-pattern>*.action</url-pattern>  
  </servlet-mapping>
 
</web-app>

2.2.2 创建java类和jsp文件

 
创建HelloController.java 
package com.Maynor.controller;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
 
@Controller  
public class HelloController {
 
   @RequestMapping("/hello.action")  
   public String show(Model model){
 
      model.addAttribute("data", "嘿嘿嘿"); 
 
      return "/WEB-INF/show01.jsp"; 
   }
 
}
 
Show01.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head> 
    <title>Title</title>
</head>
<body>
 
你好啊 老弟儿 ${data}
 
</body>
</html>
 
Index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2>Hello World!</h2>
 
<a href="${pageContext.request.contextPath}/hello.action">入门案例</a>
</body>
</html>

测试结果: index.jsp页面

点击入门案例结果:

3. 入门查询：查询所有（无xml）

3.2 需求说明

该需求跟上一个入门案例需求完全相同.

在index.html中点击 Hello SpringMVC 超链接，在 show01 .jsp 页面显示信息。

区别在于实现的时候:

使用 WebInitializer类代替web.xml

使用MVCConfig代替springmvc.xml

3.1 思路分析

书写步骤:

1.拷贝pom文件,书写MVCConfig和WebInitializer类.

2.创建HelloController和show01.jsp

项目结构如下:

3.2 步骤实现

3.2.1 拷贝pom文件,创建MVCConfig和WebInitializer类

Pom文件,沿用上一个案例.即附录 <SpringMVC01_pom>

MVCConfig类代码如下:

 
package com.Maynor.config;
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
 
@Configuration
@ComponentScan("com.Maynor.controller")  
public class MVCConfig {
}

传统Web项目中，程序的入口是web.xml文件。

在spring4中提供WebApplicationInitializer接口，表示服务器启动初始化。也就是说接口实现类中编写的内容，就是web.xml文件中配置的内容。

类或方法

描述

AnnotationConfigWebApplicationContext

WEB环境下spring工厂

servletContext.addFilter(name , Class)

添加过滤器，等效

servletContext.addServlet(name , Class)

添加servlet，等效

过滤器相关方法 ServletRegistration.Dynamic

描述

addMapping(urlPatterns)

追加过滤路径

setLoadOnStartup(int)

设置启动顺序

WebInitializer类代码如下:

 
package com.Maynor.config;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;
 
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
 
public class WebInitializer implements WebApplicationInitializer {
   @Override 
   public void onStartup(ServletContext servletContext) throws ServletException {
 
      //1.初始化spring容器 
      AnnotationConfigWebApplicationContext applicationContext = new AnnotationConfigWebApplicationContext();
      applicationContext.register(MVCConfig.class);  
      applicationContext.setServletContext(servletContext);
      //2.设置核心控制器
      ServletRegistration.Dynamic springMVCServlet = servletContext.addServlet("springmvc", new DispatcherServlet(applicationContext)); 
      springMVCServlet.addMapping("*.action"); 
      springMVCServlet.setLoadOnStartup(2);
 
   }
}

3.2.2 创建HelloController和show01.jsp

 
HelloController代码:
package com.Maynor.controller;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
 
@Controller
public class HelloController {
 
   @RequestMapping(path = "/hello.action")
   public String show(Model model){
 
      model.addAttribute("data", "呵呵呵");
      
      return "/WEB-INF/show01.jsp";
 
   }
 
 
}
Show01.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head> 
    <title>Title</title>
</head>
<body>
 
    来了 老弟儿 ${data}
 
</body>
</html>

测试结果:

练习:

查询所有. 希望得到如下结果:

参考代码:

l 编写JavaBean用于封装数据

 
public class Item {
	private String name;	//名称
	private Float price;	//价格
	private String detail;	//详情

l 编写业务控制器Controller

 
@Controller
@RequestMapping("/user")
public class HelloController {
 
    @RequestMapping("showInfo")
    public String showInfo(Model model){
        System.out.println("展示页面");
        //1 模拟数据 
        List<Item> list = new ArrayList<Item>();
        list.add(new Item("联想笔记本", 6999f, "ThinkPad T430 联想笔记本电脑！"));
        list.add(new Item("苹果手机", 8800f, "iphone X 苹果手机！"));
 
        //设置数据
        model.addAttribute("list", list);
        return "/showInfo.jsp";
    }
}

l 展示数据

 
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: 86153 
  Date: 2019/6/14 
  Time: 0:50 
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head> 
    <title>Title</title>
</head>
<body>
<table border="1"> 
    <tr> 
        <td>名称</td> 
        <td>价格</td> 
        <td>描述</td> 
    </tr> 
    <c:forEach items="${list}" var="item"> 
        <tr> 
            <td>${item.name }</td> 
            <td>${item.price }</td> 
            <td>${item.detail }</td> 
        </tr> 
    </c:forEach>
</table>
</body>
</html>

配置类

 
*MVCConfig
@Configuration
@ComponentScan("com.Maynor.controller")
public class MVCConfiguration {
 
}
 
 
WebInitalizer
public class WebInitializer implements WebApplicationInitializer {
 
	@Override
	public void onStartup(ServletContext servletContext) throws ServletException {
		//1 初始化spring容器
		AnnotationConfigWebApplicationContext appliation = new AnnotationConfigWebApplicationContext();
		appliation.register(MVCConfiguration.class);
		appliation.setServletContext(servletContext);
		
		//3 前端控制器
		ServletRegistration.Dynamic springMvcServlet = servletContext.addServlet("springmvc", new DispatcherServlet(appliation));  
		springMvcServlet.addMapping("*.action");
		springMvcServlet.setLoadOnStartup(2);
 
	}
 
}

测试:

l 步骤2：启动，并访问

http://localhost:8080/s02/user/showInfo.action

4. SSM整合:改造UMS

需求:

改造ums 实现查询所有用户.

示意图如下:

思路:

环境搭建:拷贝pom,资源文件和配置文件,初始化数据库和表,创建javaBean
编写功能:dao,Service,Controller
编写配置类:SpringConfig,MyBatisConfig,SpringMvcConfig,Web启动类.
测试

项目最终结构如下:

4.1 搭建环境

4.0.1 创建项目、拷贝pom文件

 
<org.springframework.version>4.2.4.RELEASE</org.springframework.version>
 
<dependencies> 
  <!-- spring start -->
 
  <!--spring core start--> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-beans</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-core</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-context</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-expression</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-context-support</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <!--spring core end-->
 
  <!--spring aop start--> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-aop</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <!--spirng aop end-->
 
  <!--spring aspects start--> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-aspects</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <!--spring aspects end-->
 
  <!--spring instrumentation start --> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-instrument</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <!--spring instrumentation end-->
 
  <!--spring messaging start --> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-messaging</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <!--spring messaging end-->
 
  <!--spring data access start --> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-jdbc</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-orm</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-oxm</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-jms</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-tx</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <!--spring data access end-->
 
  <!--spring web start --> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-websocket</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-web</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency>
 
 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-webmvc-portlet</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency>
 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-webmvc</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency> 
  <!--spring web end -->
 
  <!--spring test start --> 
  <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-test</artifactId> 
    <version>${org.springframework.version}</version> 
  </dependency>
 
  <!--spring test end --> 
  <!-- spring end -->
 
 
  <dependency> 
    <groupId>junit</groupId> 
    <artifactId>junit</artifactId> 
    <version>4.12</version> 
    <scope>test</scope> 
  </dependency> 
  <dependency> 
    <groupId>tk.mybatis</groupId> 
    <artifactId>mapper</artifactId> 
    <version>3.5.2</version> 
  </dependency> 
  <dependency> 
    <groupId>com.github.pagehelper</groupId> 
    <artifactId>pagehelper</artifactId> 
    <version>3.7.5</version> 
  </dependency> 
  <dependency> 
    <groupId>org.mybatis</groupId> 
    <artifactId>mybatis</artifactId> 
    <version>3.4.5</version> 
  </dependency>
 
  <dependency> 
    <groupId>mysql</groupId> 
    <artifactId>mysql-connector-java</artifactId> 
    <version>5.1.47</version> 
  </dependency> 
  <dependency> 
    <groupId>org.mybatis</groupId> 
    <artifactId>mybatis-spring</artifactId> 
    <version>1.3.2</version> 
  </dependency> 
  <dependency> 
    <groupId>com.alibaba</groupId> 
    <artifactId>druid</artifactId> 
    <version>1.1.10</version> 
  </dependency>
 
  <dependency> 
    <groupId>javax.servlet</groupId> 
    <artifactId>javax.servlet-api</artifactId> 
    <version>3.1.0</version> 
    <scope>provided</scope> 
  </dependency>
 
 
  <dependency> 
    <groupId>jstl</groupId> 
    <artifactId>jstl</artifactId> 
    <version>1.2</version> 
  </dependency>
 
 
  <dependency> 
    <groupId>javax.servlet.jsp</groupId> 
    <artifactId>jsp-api</artifactId> 
    <version>2.1</version> 
    <scope>provided</scope> 
  </dependency>
  
</dependencies>
 
 
<!-- jdk版本插件 -->
<plugin> 
  <groupId>org.apache.maven.plugins</groupId> 
  <artifactId>maven-compiler-plugin</artifactId> 
  <version>3.2</version> 
  <configuration> 
    <source>1.8</source> 
    <target>1.8</target> 
    <encoding>UTF-8</encoding> 
    <showWarnings>true</showWarnings> 
  </configuration>
</plugin>
 
<!-- tomcat7插件 -->
<plugin> 
  <groupId>org.apache.tomcat.maven</groupId> 
  <artifactId>tomcat7-maven-plugin</artifactId> 
  <version>2.1</version> 
  <configuration> 
    <port>8081</port> 
    <server>tomcat7</server> 
  </configuration>
</plugin>

4.0.2 拷贝UMS页面

4.0.3 配置文件

jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://127.0.0.1:3306/ums_db jdbc.username=root jdbc.password=1234

4.0.4 初始化数据库和表

 
CREATE TABLE t_user (
 
 uid INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,
 
 login_name VARCHAR(50) DEFAULT NULL,
 
 login_pwd VARCHAR(32) DEFAULT NULL,
 
 age INT(11) DEFAULT NULL,
 
 birthday DATE DEFAULT NULL,
 
 sex VARCHAR(1) DEFAULT NULL,
 
 education VARCHAR(50),
 
 telephone VARCHAR(11),
 
 interest VARCHAR(100),
 
 remark VARCHAR(200)
 
)
insert  into `t_user`(`uid`,`login_name`,`login_pwd`,`age`,`birthday`,`sex`,`education`,`telephone`,`interest`,`remark`) values (1,'jack','1234',18,'1996-11-11','男',NULL,NULL,NULL,NULL),(2,'rose','1234',21,'1993-11-11','女',NULL,NULL,NULL,NULL),(3,'tom','1234',23,'1996-12-24','男',NULL,NULL,NULL,NULL);

4.0.5 创建JavaBean

 
@Table(name="t_user")
public class User {
	@Id
	private Integer uid;
	private String loginName;
	private String loginPwd;
	private Integer age;
	private String sex;
	private String birthday;
	private String education;
	private String telephone;
	private String interest;		//爱好：对应数据库（内容：A,B,C）
	private String[] interestArr;	//爱好：对应页面表单
	private String remark;

l 爱好需要特殊处理

 
	public String getInterest() {
		if(interestArr != null){
			interest = Arrays.toString(interestArr);  //[A,B,C]
			interest = interest.substring(1, interest.length() - 1);	//A,B,C
		}
		return interest;
	}
	public void setInterest(String interest) {
		this.interest = interest;
		if(interest != null){
			interestArr = interest.split(", ");
		}
	}

4.1 编写功能：dao、service、web、jsp页面

4.1.1 编写mapper接口（dao）

 
package com.Maynor.dao;
 
import com.Maynor.domain.User;
import tk.mybatis.mapper.common.Mapper;
 
public interface UserMapper extends Mapper<User> {
}

4.1.2 编写service接口

 
package com.Maynor.service;
 
import com.Maynor.domain.User;
 
import java.util.List;
 
public interface UserService {
 
   public List<User> findAll();
   
}

4.1.3 编写service实现类

 
package com.Maynor.service.impl;
 
import com.Maynor.dao.UserMapper;
import com.Maynor.domain.User;
import com.Maynor.service.UserService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import tk.mybatis.mapper.common.Mapper;
 
import javax.annotation.Resource;
import java.util.List;
 
@Service(value = "userServiceImpl")
@Transactional
public class UserServiceImpl implements UserService {
 
 
   @Resource 
   private UserMapper userMapper;
 
   @Override 
   public List<User> findAll() {
 
      List<User> users = userMapper.selectAll();
 
      return users;
   }
}

4.1.4 编写Controller

 
package com.Maynor.controller;
 
 
import com.Maynor.domain.User;
import com.Maynor.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
 
import javax.annotation.Resource;
import java.util.List;
 
@Controller
public class UserController {
 
   @Autowired 
   private UserService userService;
 
   @RequestMapping("/findAllUsers.action") 
   public String findAll(Model model){
 
      List<User> userList = userService.findAll();
 
      model.addAttribute("userList", userList);
 
      return "/user/list.jsp";
   }
 
 
}

4.1.5 编写jsp

List.jsp

Left.jsp


${pageContext.request.contextPath}/findAllUsers.action

4.2 编写配置类

4.2.1 spring配置类

 
package com.Maynor.config;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;
import org.springframework.web.bind.annotation.RequestMapping;
 
import javax.annotation.Resource;
import javax.sql.DataSource;
 
//配置类
@Configuration
//要扫描的包
@ComponentScan(basePackages = {"com.Maynor"})
//开启事务支持
@EnableTransactionManagement
//读取properties配置文件
@PropertySource(value = "classpath:db.properties")
public class SpringConfig {
 
   //4.2.4 读取properties的固定代码 
   @Bean 
   public static PropertySourcesPlaceholderConfigurer create(){
 
      return new PropertySourcesPlaceholderConfigurer();
   }
   //读取数据库中的相关配置 
   @Value("${jdbc.driver}") 
   private String driverClass;
   @Value("${jdbc.url}") 
   private String url;
   @Value("${jdbc.username}") 
   private String username;
   @Value("${jdbc.password}") 
   private String password;
 
 
   //设置德鲁伊连接池 
   @Bean 
   public DataSource dataSource(){
      DruidDataSource dataSource = new DruidDataSource();
      dataSource.setPassword(password);
      dataSource.setUsername(username);
      dataSource.setUrl(url);
      dataSource.setDriverClassName(driverClass);
      return dataSource;
   }
   //开启事务管理器 
   @Bean 
   @Resource 
   public DataSourceTransactionManager txManager(DataSource dataSource){
      return  new DataSourceTransactionManager(dataSource);
   }
}

4.2.2 mybatis配置类

 
package com.Maynor.config;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;
import org.springframework.web.bind.annotation.RequestMapping;
 
import javax.annotation.Resource;
import javax.sql.DataSource;
 
//配置类
@Configuration
//要扫描的包
@ComponentScan(basePackages = {"com.Maynor"})
//开启事务支持
@EnableTransactionManagement
//读取properties配置文件
@PropertySource(value = "classpath:db.properties")
public class SpringConfig {
 
   //4.2.4 读取properties的固定代码 
   @Bean 
   public static PropertySourcesPlaceholderConfigurer create(){
 
      return new PropertySourcesPlaceholderConfigurer();
   }
   //读取数据库中的相关配置 
   @Value("${jdbc.driver}") 
   private String driverClass;
   @Value("${jdbc.url}") 
   private String url;
   @Value("${jdbc.username}") 
   private String username;
   @Value("${jdbc.password}") 
   private String password;
 
 
   //设置德鲁伊连接池 
   @Bean 
   public DataSource dataSource(){
      DruidDataSource dataSource = new DruidDataSource();
      dataSource.setPassword(password);
      dataSource.setUsername(username);
      dataSource.setUrl(url);
      dataSource.setDriverClassName(driverClass);
      return dataSource;
   }
   //开启事务管理器 
   @Bean 
   @Resource 
   public DataSourceTransactionManager txManager(DataSource dataSource){
      return  new DataSourceTransactionManager(dataSource);
   }
}

4.2.3 spring mvc 配置类【无内容】

 
package com.Maynor.config;
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
 
//声明为配置类
@Configuration
//设置扫描 controller
@ComponentScan("com.Maynor.controller")
public class SpringMvcConfig {
}

4.2.4 web启动配置类【新内容】

传统Web项目中，程序的入口是web.xml文件。

在spring4中提供WebApplicationInitializer接口，表示服务器启动初始化。也就是说接口实现类中编写的内容，就是web.xml文件中配置的内容。

类或方法

描述

AnnotationConfigWebApplicationContext

WEB环境下spring工厂

servletContext.addFilter(name , Class)

添加过滤器，等效

servletContext.addServlet(name , Class)

添加servlet，等效

过滤器相关方法 ServletRegistration.Dynamic

描述

addMapping(urlPatterns)

追加过滤路径

setLoadOnStartup(int)

设置启动顺序

过滤器相关方法 FilterRegistration.Dynamic

描述

addMappingForUrlPatterns(null, isMatchAfter, urlPatterns)

追加过滤路径参数2：参数3：路径

 
package com.Maynor.config;
 
 
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.DispatcherServlet;
 
import javax.servlet.FilterRegistration;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
 
public class WebInitializer implements WebApplicationInitializer {
   @Override 
   public void onStartup(ServletContext servletContext) throws ServletException {
      //1.初始化 Spring 容器 
      AnnotationConfigWebApplicationContext applicationContext  = new AnnotationConfigWebApplicationContext();
      applicationContext.register(SpringMvcConfig.class);
      applicationContext.register(SpringConfig.class);
      applicationContext.register(MybatisConfig.class);
      applicationContext.setServletContext(servletContext);
 
      //2.设置核心控制器
      ServletRegistration.Dynamic ds = servletContext.addServlet("springmvc", new DispatcherServlet(applicationContext));
      ds.addMapping("*.action");
      ds.setLoadOnStartup(2);
 
 
      //3 post乱码配置    
      FilterRegistration.Dynamic encodingFilter = servletContext.addFilter("CharacterEncodingFilter", new CharacterEncodingFilter("UTF-8"));
      encodingFilter.addMappingForUrlPatterns(null, true, "/*");
 
   }
}

4.3 测试

启动项目,点击用户管理可以看到如下效果即可.

5. 视图解析器

5.1 分析

5.2 修改代码

l 其他代码与“查询所有”案例相同，不同内容如下：

5.2.1 编写控制器

l 业务控制器返回“视图”名称

 
@Controller
@RequestMapping("/user")
public class ItemsController {
	
	@RequestMapping("/itemsList")
	public String itemsList(Model model) throws Exception {
		
		//1 模拟数据
		List<Items> list = new ArrayList<Items>();
		list.add(new Items("联想笔记本", 6999f, "ThinkPad T430 联想笔记本电脑！"));
		list.add(new Items("苹果手机", 8800f, "iphone X 苹果手机！"));
		
		//设置数据
		model.addAttribute("list", list);
		
		return "itemslist"; //"/WEB-INF/jsp/itemslist.jsp";
	}
 
}

5.2.2 配置视图解析器

 
@Configuration
@ComponentScan("com.Maynor.controller")
public class MVCConfiguration {
	@Bean
	public InternalResourceViewResolver viewResolver(){
		InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
		viewResolver.setPrefix("/WEB-INF/jsp/");
		viewResolver.setSuffix(".jsp");
		return viewResolver;
	}
}

6. SSM整合：改造UMS（添加视图解析器）

7. 参数绑定

7.1 简单数据类型

l 在控制器的方法中，只要有对应的参数名，spring mvc就可以自动完成参数封装。

7.1.1 支持的数据类型

l 参数类型推荐使用包装数据类型，因为基础数据类型不可以为null，此时进行访问没有设置参数，程序抛异常。

数据类型

整型：Integer、int

字符串：String

单精度：Float、float

双精度：Double、double

布尔型：Boolean、boolean

7.1.2 @RequestParam

l 如果请求参数名和方法参数名不一致时，需要使用@RequestParam标记对应关系。

l 如果类型是基本类型，此时没有参数，默认抛异常。

解决方案1：可以设置默认值。

解决方案2：可以设置成包装类型

7.2 绑定POJO类型

 
JSP页面
<form action="${pageContext.request.contextPath}/user/additems.action" method="post">
		姓名：<input type="text" name="name"/> <br/>
		价格：<input type="text" name="price"/> <br/>
		<input type="submit" value="提交" />
	</form>
控制器：
@Controller
@RequestMapping("/user")
public class ItemsController {
 
	@RequestMapping("additems")
	public String addItems(Items items){
		System.out.println(items);
		return "itemslist";
	}
}

l 分析

l 注意：数据不能是日期，日期必须采用自定义参数绑定。

7.3 POST中文乱码

 
在web.xml文件中
<filter>
    <filter-name>encodingFilter</filter-name> 
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 
    <init-param> 
        <param-name>encoding</param-name> 
        <param-value>UTF-8</param-value> 
    </init-param> 
    <init-param> 
        <param-name>forceEncoding</param-name> 
        <param-value>true</param-value> 
    </init-param>
</filter>
<filter-mapping> 
    <filter-name>encodingFilter</filter-name> 
    <url-pattern>/*</url-pattern>
</filter-mapping>
我们采用web启动配置类的方式
	@Override
	public void onStartup(ServletContext servletContext) throws ServletException {
		//1 初始化spring容器
		AnnotationConfigWebApplicationContext appliation = new AnnotationConfigWebApplicationContext();
		appliation.register(MVCConfiguration.class);
		appliation.setServletContext(servletContext);
		
		//2 post乱码配置 
		FilterRegistration.Dynamic encodingFilter = servletContext.addFilter("CharacterEncodingFilter", new CharacterEncodingFilter("UTF-8"));
		encodingFilter.addMappingForUrlPatterns(null, true, "/*");
		
		//3 前端控制器
		ServletRegistration.Dynamic springMvcServlet = servletContext.addServlet("springmvc", new DispatcherServlet(appliation));  
		springMvcServlet.addMapping("*.action");
		springMvcServlet.setLoadOnStartup(2);
 
	}

7.4 绑定包装POJO

 
提供JavaBean：QueryVo
public class QueryVo {
	private Items items;
 
	public Items getItems() {
		return items;
	}
 
	public void setItems(Items items) {
		this.items = items;
	}
}
修改控制器
	@RequestMapping("findall")
	public String findAll(QueryVo queryVo){
		System.out.println(queryVo.getItems());
		return "itemslist";
	}
JSP页面
<form action="${pageContext.request.contextPath}/user/findall.action" method="post">
		姓名：<input type="text" name="items.name"/> <br/>
		价格：<input type="text" name="items.price"/> <br/>
		<input type="submit" value="提交findall" />
	</form>

7.5 自定义参数绑定

由于日期数据有很多种格式，所以springmvc没办法把字符串转换成日期类型(不够智能,2019/01/01这种格式可以自动转,2019-01-01这种格式就不能了)。所以需要自定义参数绑定。

 
JavaBean
public class QueryVo {
	private Items items;
	private Date createDate;
JSP页面
<form action="${pageContext.request.contextPath}/user/findall2.action" method="post">
		姓名：<input type="text" name="items.name"/> <br/>
		价格：<input type="text" name="items.price"/> <br/>
		日期：<input type="text" name="createDate"/> <br/>
		<input type="submit" value="提交findall2" />
	</form>
控制器
	@RequestMapping("findall2")
	public String findAll2(QueryVo queryVo){
		System.out.println(queryVo.getItems());
		System.out.println(queryVo.getCreateDate());
		return "itemslist";
	}

方式一:

\1. 在MVCConfig类上添加@EnableWebMvc 注解

\2. 在实体类上添加注解@DateTimeFormat

 
JavaBean
public class QueryVo {
	private Items items;
	private Date createDate;
JSP页面
<form action="${pageContext.request.contextPath}/user/findall2.action" method="post">
		姓名：<input type="text" name="items.name"/> <br/>
		价格：<input type="text" name="items.price"/> <br/>
		日期：<input type="text" name="createDate"/> <br/>
		<input type="submit" value="提交findall2" />
	</form>
控制器
	@RequestMapping("findall2")
	public String findAll2(QueryVo queryVo){
		System.out.println(queryVo.getItems());
		System.out.println(queryVo.getCreateDate());
		return "itemslist";
	}

7.6 绑定数组

 
JavaBean
public class QueryVo {
	private Items items;
	private Date createDate;
JSP页面
<form action="${pageContext.request.contextPath}/user/findall2.action" method="post">
		姓名：<input type="text" name="items.name"/> <br/>
		价格：<input type="text" name="items.price"/> <br/>
		日期：<input type="text" name="createDate"/> <br/>
		<input type="submit" value="提交findall2" />
	</form>
控制器
	@RequestMapping("findall2")
	public String findAll2(QueryVo queryVo){
		System.out.println(queryVo.getItems());
		System.out.println(queryVo.getCreateDate());
		return "itemslist";
	}

7.7 表单数据绑定到List

 
JavaBean
public class QueryVo {
	private Items items;
	private Date createDate;
JSP页面
<form action="${pageContext.request.contextPath}/user/findall2.action" method="post">
		姓名：<input type="text" name="items.name"/> <br/>
		价格：<input type="text" name="items.price"/> <br/>
		日期：<input type="text" name="createDate"/> <br/>
		<input type="submit" value="提交findall2" />
	</form>
控制器
	@RequestMapping("findall2")
	public String findAll2(QueryVo queryVo){
		System.out.println(queryVo.getItems());
		System.out.println(queryVo.getCreateDate());
		return "itemslist";
	}

8. @RequestMapping

8.1 多路径映射

l 同时设置多个路径

 
@RequestMapping(value={"/index","/index2"})
	public String index(){
		return "itemslist";
	}
 
http://localhost:8080/spring_mvc_day01_05/user/index.action
http://localhost:8080/spring_mvc_day01_05/user/index2.action
//都可以访问

8.2 窄化请求路径

@RequestMapping放在类名上边，设置请求前缀

@RequestMapping放在方法名上边，设置方法对应请求路径。

完整请求：前缀 + 请求路径

8.3 请求方法限定

l 限定GET方法 @RequestMapping(method = RequestMethod.GET) l 限定POST方法 @RequestMapping(method = RequestMethod.POST) l GET和POST都可以 @RequestMapping(method={RequestMethod.GET,RequestMethod.POST})

9. Controller方法返回值

9.1 返回ModelAndView

controller方法中定义ModelAndView对象并返回，对象中可添加model数据、指定view。

 
@RequestMapping("/findById")
	public ModelAndView findById(){
		ModelAndView modelAndview = new ModelAndView();
		//设置数据
		modelAndview.addObject("id", "猜猜看");
		//设置视图
		modelAndview.setViewName("itemslist");
		return modelAndview;
	}

9.2 返回void

如果方法返回void，有3种情况：request请求转发、response重定向、给前端响应Json

 
请求转发
@RequestMapping("/findById2")
public void findById2(HttpServletRequest request , HttpServletResponse response) 
								throws ServletException, IOException{
	request.getRequestDispatcher("/index.jsp").forward(request, response);
}
重定向
@RequestMapping("/findById3")
public void findById3(HttpServletRequest request , HttpServletResponse response) 
								throws ServletException, IOException{
	response.sendRedirect(request.getContextPath() + "/index.jsp");
}
Json 处理
@RequestMapping("/findById4")
public void findById4(HttpServletRequest request , HttpServletResponse response)
								 throws ServletException, IOException{
	response.setCharacterEncoding("UTF-8");
	response.setContentType("application/json;charset=UTF-8");
	String jsonStr = "{\"username\":\"jack\"}";
	response.getWriter().write(jsonStr);
}

9.3 返回字符串

9.3.1 逻辑视图名

controller方法返回字符串可以指定逻辑视图名，通过视图解析器解析为物理视图地址。

 
@RequestMapping(value={"/index","/index2"})
public String index(){
	return "itemslist";
}

9.3.2 Redirect重定向

Contrller方法返回结果重定向到一个url地址，如下商品修改提交后重定向到商品查询方法，参数无法带到商品查询方法中。

 
return "redirect:其他路径";
 
@RequestMapping("/update")
public String update() throws ServletException, IOException{
	return "redirect:queryItem.action";
}

9.3.3 forward转发

controller方法执行后继续执行另一个controller方法，如下商品修改提交后转向到商品修改页面，修改商品的id参数可以带到商品修改方法中。

 
return "forward:其他路径";
@RequestMapping("/updateSubmit")
public String updateSubmit() throws ServletException, IOException{
	return "forward:editItem.action";
}

10. 异常处理器

10.1 异常处理器分析

10.2 自定义异常

 
public class CustomException extends Exception {
 
	private static final long serialVersionUID = 8222256702797084775L;
 
	public CustomException() {
		super();
	}
 
	public CustomException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
	}
 
	public CustomException(String message, Throwable cause) {
		super(message, cause);
	}
 
	public CustomException(String message) {
		super(message);
	}
 
	public CustomException(Throwable cause) {
		super(cause);
	}
	
}

10.3 异常处理器编写

 
public class CustomException extends Exception {
 
	private static final long serialVersionUID = 8222256702797084775L;
 
	public CustomException() {
		super();
	}
 
	public CustomException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
	}
 
	public CustomException(String message, Throwable cause) {
		super(message, cause);
	}
 
	public CustomException(String message) {
		super(message);
	}
 
	public CustomException(Throwable cause) {
		super(cause);
	}
	
}

10.4 异常页面

 
<body>
	您的操作出现错误如下：<br/>
	${message }
</body>

10.5 测试程序

 
@Controller
@RequestMapping("/user")
public class ItemsController {
	
	@RequestMapping("index")
	public String index(String id) throws CustomException{
		if(id == null){
			throw new CustomException("没有id参数");
		}
		return "itemslist";
	}
}
 
<a href="${pageContext.request.contextPath}/user/index.action">异常演示</a><br/>

异常演示

11. 上传图片

11.1 单图片上传

11.1.1 JSP页面

 
<form id="itemForm" action="${pageContext.request.contextPath }/user/upload.action" method="post" enctype="multipart/form-data">
		姓名：<input type="text" name="name"/> <br/>
		价格：<input type="text" name="price"/> <br/>
		图片：<input type="file" name="picFile"/> <br/>
		<input type="submit" value="提交" />
	</form>

11.1.2 文件上传解析器

 
<form id="itemForm" action="${pageContext.request.contextPath }/user/upload.action" method="post" enctype="multipart/form-data">
		姓名：<input type="text" name="name"/> <br/>
		价格：<input type="text" name="price"/> <br/>
		图片：<input type="file" name="picFile"/> <br/>
		<input type="submit" value="提交" />
	</form>

l 使用的commons-fileupload完成上传，确定导入fileupload jar包

 
<dependency> 
  <groupId>commons-fileupload</groupId> 
  <artifactId>commons-fileupload</artifactId> 
  <version>1.2.2</version>
</dependency>
 
<dependency> 
  <groupId>commons-io</groupId> 
  <artifactId>commons-io</artifactId> 
  <version>2.3</version>
</dependency>

11.1.3 Controller实现

需要使用MultipartFile类型表示一个文件上传对象。

方法名

描述

String getOriginalFilename()

获得原始上传文件名

transferTo(File file)

将上传文件转换到一个指定的文件中

String getContentType()

获取文件MIME类型，如image/pjpeg、text/plain等

String getName()

获取表单中文件组件的名字

 
	@RequestMapping("upload")
	public String upload(String name,Double price,
@RequestParam(required=false,value="picFile") MultipartFile picFile) throws Exception{
		System.out.println("姓名：" + name);
		System.out.println("价格：" + price);
		
		String originalFileName = picFile.getOriginalFilename();
		System.out.println("上传文件名：" + originalFileName);
		//保存文件到指定的位置
		File file = new File("D:\\temp", originalFileName);
		picFile.transferTo(file);
		return "itemslist";
	}

11.2 多图片上传

11.2.1 JSP页面

 
<form id="itemForm" action="${pageContext.request.contextPath }/user/upload2.action"
 								method="post" enctype="multipart/form-data">
		姓名：<input type="text" name="name"/> <br/>
		价格：<input type="text" name="price"/> <br/>
		图片：<input type="file" name="picFile"/> <br/>
		图片：<input type="file" name="picFile"/> <br/>
		<input type="submit" value="提交" />
	</form>

11.2.2 JavaBean

 
public class QueryVo {
	private String name;
	private Double price;
	public List<MultipartFile> picFile;
 
	//getter and setter

11.2.3 Controller实现

 
@RequestMapping("upload2")
	public String upload2(QueryVo queryVo) throws Exception{
		System.out.println("姓名：" + queryVo.getName());
		System.out.println("价格：" + queryVo.getPrice());
		
		System.out.println("上传文件个数：" + queryVo.getPicFile().size());
		for(MultipartFile picFile : queryVo.getPicFile()){
			String originalFileName = picFile.getOriginalFilename();
			System.out.println("上传文件名：" + originalFileName);
			//保存文件到指定的位置
			File file = new File("D:\\temp", originalFileName);
			picFile.transferTo(file);
		}
		return "itemslist";
	}

12. JSON数据交互

12.1 概述

@RequestBody：将json、xml 等内容转换成Java对象。

@ResponseBody：将Java对象转换成 json、xml等内容。

12.2 前端发送ajax请求,后端获取json数据

需求:

前端发送ajax请求,后端通过VO自动获取数据打印

 
  前端代码:
   <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head> 
    <title>Title</title>
 
    <script src="${pageContext.request.contextPath}/js/jquery-3.3.1.js"></script> 
    <script>
        $(function () {
 
            var url = "${pageContext.request.contextPath}/tJson.action";
            var params={
                "name":"zhangsan",
                "price":"123"
            }
            var callBack=function (rel) {
                //后端有返回结果 就会弹窗显示, 没有就不会弹窗 
                alert(rel.name+" "+rel.price)
            }
            //发射
            $.post(url,params,callBack,"json")
 
        })
    </script>
</head>
<body>
  页面加载完毕就发射ajax 
</body>
</html>
后端代码: 
 Qvo 
  public class QVo {
 
    private String name;
    private Double price;
....
}
 
Controller
@RequestMapping("/tJson.action")
public String testJson(QVo qvo){
    //查看前端传递的json 自动转化的VO结果 
    System.out.println(qvo);
 
    return "/show04.jsp";//随便转发到一个页面,不影响测试结果.
}

测试结果:

12.3 后端给前端响应Json数据.

需求:

跟上一个例子类似, 前端发送请求给后端, 后端接收数据后给前端再相应回一个json数据.

该例子中,需要直接把java对象通过SpringMvc自动转化成json数据. 需要使用两个东西完成.

\1. 导入Jackson-databind坐标

\2. 在方法的返回值上使用@ResponseBody注解.

具体代码如下:

 
Pom文件坐标
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId> 
  <artifactId>jackson-databind</artifactId> 
  <version>2.9.7</version>
</dependency>
 
Controller代码:
@RequestMapping("tj.action")
public @ResponseBody QVo getInfo(String name,Double price){
 
    System.out.println("接收到前端数据:"+name+" "+price);
 
    //创建一个对象, 通过SpringMvc自动把这个对象转化成Json响应给前端 
    QVo qVo = new QVo("lisiguang", 220.4);
    return qVo;
}
 
前端:
<script src="${pageContext.request.contextPath}/js/jquery-3.3.1.js"></script>
<script>
    $(function () {
 
        var url = "${pageContext.request.contextPath}/tj.action";
        var params={
            "name":"zhangsan",
            "price":"123"
        }
        var callBack=function (rel) {
            //后端有返回结果 就会弹窗显示, 没有就不会弹窗 
            alert(rel.name+" "+rel.price)
        }
        //发射
        $.post(url,params,callBack,"json")
 
    })
</script>

测试结果:

后端:

前端:

13. RESTful支持

13.1 什么是RESTful

Restful就是一个资源定位及资源操作的风格。不是标准也不是协议，只是一种风格，是对http协议的诠释。 l 资源定位：每一个URL都是一个资源。要求url中没有动词，只有名词。没有参数 Url格式：http://blog.csdn.net/beat_the_world/article/details/45621673 l 资源操作：通过HTTP请求方式确定不同的操作。 get查询资源、post新建资源(也可以修改资源)、put更新资源、delete删除资源。一般使用时还是post和get。 @RequestMapping(value="/viewItems/{id}" , method= RequestMethod.GET ) l RESTful初体验在URL中包含操作的数据，而不是通过参数进行传递。

13.2 添加jar包

13.3 修改web.xml，支持RESTful

 
	<!-- 前端控制器 --> 
  <servlet>
  	<servlet-name>springmvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param> 
  </servlet> 
  <servlet-mapping>
  	<servlet-name>springmvc</servlet-name>
  	<url-pattern>/</url-pattern> 
  </servlet-mapping>

13.4 JSP页面

 
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
	<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.12.4.js"></script>
	<script type="text/javascript">
		$(function(){
			alert("静态资源(js)可以使用");
		});
	</script>
</head>
<body>
	<a href="${pageContext.request.contextPath}/user/viewItems/1">查询id=1</a><br/>
	<a href="${pageContext.request.contextPath}/user/viewItems/999.action">查询id=999</a><br/>
	
</body>

13.5 Controller实现

通过@RequestMapping可以设置URL模板模式映射。 @RequestMapping(value="/ viewItems/{xxx}") ，{xxx}相当于占位符，可以匹配到/viewItems/1、/viewItems/2 等路径 xxx就是占位符的名称，用于方法参数获得匹配到的数据 通过@PathVariable(“xxx”) 获得从路径匹配到的对应数据

 
	@RequestMapping("/viewItems/{id}")
	public String viewItems(@PathVariable("id") String id , Model model) {
		model.addAttribute("id", id);
		return "itemslist";
	}

13.6 静态资源问题及解决

l 当程序运行时，首页的js代码将不能执行。

原因：DispatcherServlet中设置url-pattern为 /，静态资源不能成功访问。

解决：配置 mvc:resources

 
<!-- 确保所有注解正常使用 -->
<mvc:annotation-driven></mvc:annotation-driven>
	
<!-- 静态资源访问 -->
<mvc:resources location="/js/" mapping="/js/*"></mvc:resources>

14. 拦截器

14.1 概述

Spring Web MVC 的处理器拦截器类似于Servlet 开发中的过滤器Filter，用于对处理器执行前后进行处理。

自定义连接性需要实现接口：HandlerInterceptor

14.2 分析

方法名

描述

boolean preHandle()

在处理器(控制器)前执行。返回一个boolean值。true：继续执行处理器。false：程序直接结束。

void postHandle()

在处理器方法执行后，视图显示前执行。

void afterCompletion()

在视图解析成功后执行。

14.3 自定义拦截器

14.3.1 JSP页面，测试入口


<a href="${pageContext.request.contextPath}/user/index.action">拦截器演示</a><br/>

14.3.2 控制器，测试程序

 
@Controller
@RequestMapping("/user")
public class ItemsController {
	
	@RequestMapping("index")
	public String index(String id) {
		System.out.println("2.controller");
		return "itemslist";
	}
}

14.3.3 拦截器实现类

 
package com.Maynor.interceptor;
 
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
@Component
public class MyInterceptor1 implements HandlerInterceptor {
    /*
     * 在方法执行之前执行
     * 如果返回true 继续执行下一个拦截器
     * 如果返回false，请求被终止
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */ 
    @Override 
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("MyInterceptor1拦截器的preHandle");
        return true;
    }
 
    @Override 
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("MyInterceptor1拦截器的postHandle");
    }
 
    @Override 
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("MyInterceptor1拦截器的afterCompletion");
    }
}

14.3.4 注册拦截器

拦截器编写完成之后，需要在SpringMVCConfiguration配置文件中注册

注册步骤：

1 SpringMVCConfiguration实现WebMvcConfigurerAdapter

2 重写AddInterceptors方法

 
public class SpringMvcConfig  extends WebMvcConfigurerAdapter {
    @Autowired 
    private MyInterceptor1 myInterceptor1;
 
    @Override 
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration interceptorRegistration1 = registry.addInterceptor(myInterceptor1);
        interceptorRegistration1.addPathPatterns("/*");
    }
     //.....
}

14.3.5 执行结果

14.4 多拦截器配置

14.4.1 分析

14.4.2 拦截器实现类

 
package com.Maynor.interceptor;
 
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Component
public class MyInterceptor2 implements HandlerInterceptor {
    /*
     * 在方法执行之前执行
     * 如果返回true 继续执行下一个拦截器
     * 如果返回false，则程序终止
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */ 
    @Override 
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("MyInterceptor2拦截器的preHandle");
        return true;
    }
 
    @Override 
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("MyInterceptor2拦截器的postHandle");
    }
 
    @Override 
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("MyInterceptor2拦截器的afterCompletion");
    }
}

14.4.3 注册拦截器

 
@Resource
private MyInterceptor1 myInterceptor1;
 
@Resource
private MyInterceptor2 myInterceptor2;
 
@Override
public void addInterceptors(InterceptorRegistry registry) {
 
    //拦截全部 
    InterceptorRegistration interceptorRegistration2 = registry.addInterceptor(myInterceptor2);
    interceptorRegistration2.addPathPatterns("/*");
    //拦截全部 
    InterceptorRegistration interceptorRegistration = registry.addInterceptor(myInterceptor1);
    interceptorRegistration.addPathPatterns("/*");
 
}

14.4.4 执行结果

15. 附录

用到的相关配置文件

15.1 SpringMVC01_pom

SpringMVC入门案例1的pom文件核心代码

Pom.xml文件

 
<properties> 
  <org.springframework.version>4.2.4.RELEASE</org.springframework.version>
</properties>
 
 
<dependencies> 
    <!-- spring start -->
 
    <!--spring core start--> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-beans</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-core</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-context</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-expression</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-context-support</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <!--spring core end-->
 
    <!--spring aop start--> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-aop</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <!--spirng aop end-->
 
    <!--spring aspects start--> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-aspects</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <!--spring aspects end-->
 
    <!--spring instrumentation start --> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-instrument</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <!--spring instrumentation end-->
 
    <!--spring messaging start --> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-messaging</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <!--spring messaging end-->
 
    <!--spring data access start --> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-jdbc</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-orm</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-oxm</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-jms</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-tx</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <!--spring data access end-->
 
    <!--spring web start --> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-websocket</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-web</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency>
 
 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-webmvc-portlet</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency>
 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-webmvc</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency> 
    <!--spring web end -->
 
    <!--spring test start --> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-test</artifactId> 
        <version>${org.springframework.version}</version> 
    </dependency>
 
    <!--spring test end --> 
    <!-- spring end -->
 
 
    <dependency> 
        <groupId>junit</groupId> 
        <artifactId>junit</artifactId> 
        <version>4.12</version> 
        <scope>test</scope> 
    </dependency> 
    <dependency> 
        <groupId>tk.mybatis</groupId> 
        <artifactId>mapper</artifactId> 
        <version>3.5.2</version> 
    </dependency> 
    <dependency> 
        <groupId>com.github.pagehelper</groupId> 
        <artifactId>pagehelper</artifactId> 
        <version>3.7.5</version> 
    </dependency> 
    <dependency> 
        <groupId>org.mybatis</groupId> 
        <artifactId>mybatis</artifactId> 
        <version>3.4.5</version> 
    </dependency>
 
    <dependency> 
        <groupId>mysql</groupId> 
        <artifactId>mysql-connector-java</artifactId> 
        <version>5.1.47</version> 
    </dependency> 
    <dependency> 
        <groupId>org.mybatis</groupId> 
        <artifactId>mybatis-spring</artifactId> 
        <version>1.3.2</version> 
    </dependency> 
    <dependency> 
        <groupId>com.alibaba</groupId> 
        <artifactId>druid</artifactId> 
        <version>1.1.10</version> 
    </dependency>
 
    <dependency> 
        <groupId>javax.servlet</groupId> 
        <artifactId>javax.servlet-api</artifactId> 
        <version>3.1.0</version> 
        <scope>provided</scope> 
    </dependency>
 
    <dependency> 
        <groupId>jstl</groupId> 
        <artifactId>jstl</artifactId> 
        <version>1.2</version> 
    </dependency>
 
</dependencies>
 
<!-- jdk版本插件 -->
<plugin> 
  <groupId>org.apache.maven.plugins</groupId> 
  <artifactId>maven-compiler-plugin</artifactId> 
  <version>3.2</version> 
  <configuration> 
    <source>1.8</source> 
    <target>1.8</target> 
    <encoding>UTF-8</encoding> 
    <showWarnings>true</showWarnings> 
  </configuration>
</plugin>
 
<!-- tomcat7插件 -->
<plugin> 
  <groupId>org.apache.tomcat.maven</groupId> 
  <artifactId>tomcat7-maven-plugin</artifactId> 
  <version>2.1</version> 
  <configuration> 
    <port>8080</port> 
    <server>tomcat7</server> 
  </configuration>
</plugin>

后记

📢博客主页：https://manor.blog.csdn.net 📢欢迎点赞 👍 收藏 ⭐留言 📝 如有错误敬请指正！ 📢本文由 manor 原创，首发于 CSDN博客🙉 📢不能老盯着手机屏幕，要不时地抬起头，看看老板的位置⭐

	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
	http://www.springframework.org/schema/mvc
	http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context-4.2.xsd">
	<!-- 扫描注解包 -->
	<context:component-scan base-package="com.Maynor.controller" />
	</beans>

	<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
	version="4.0">

	<display-name>Archetype Created Web Application</display-name>


	<!-- 设置核心配置器 -->
	<servlet>
	<servlet-name>springmvc</servlet-name>
	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	<init-param>
	<param-name>contextConfigLocation</param-name>
	<param-value>classpath:springmvc.xml</param-value>
	</init-param>
	</servlet>
	<servlet-mapping>
	<servlet-name>springmvc</servlet-name>
	<url-pattern>*.action</url-pattern>
	</servlet-mapping>

	</web-app>

	创建HelloController.java
	package com.Maynor.controller;

	import org.springframework.stereotype.Controller;
	import org.springframework.ui.Model;
	import org.springframework.web.bind.annotation.RequestMapping;

	@Controller
	public class HelloController {

	@RequestMapping("/hello.action")
	public String show(Model model){

	model.addAttribute("data", "嘿嘿嘿");

	return "/WEB-INF/show01.jsp";
	}

	}

	Show01.jsp
	<%@ page contentType="text/html;charset=UTF-8" language="java" %>
	<html>
	<head>
	<title>Title</title>
	</head>
	<body>

	你好啊老弟儿 ${data}

	</body>
	</html>

	Index.jsp
	<%@ page contentType="text/html;charset=UTF-8" language="java" %>
	<html>
	<body>
	<h2>Hello World!</h2>

	<a href="${pageContext.request.contextPath}/hello.action">入门案例</a>
	</body>
	</html>

	package com.Maynor.config;

	import org.springframework.context.annotation.ComponentScan;
	import org.springframework.context.annotation.Configuration;

	@Configuration
	@ComponentScan("com.Maynor.controller")
	public class MVCConfig {
	}

	package com.Maynor.config;

	import org.springframework.context.ApplicationContext;
	import org.springframework.context.annotation.AnnotationConfigApplicationContext;
	import org.springframework.web.WebApplicationInitializer;
	import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
	import org.springframework.web.servlet.DispatcherServlet;

	import javax.servlet.ServletContext;
	import javax.servlet.ServletException;
	import javax.servlet.ServletRegistration;

	public class WebInitializer implements WebApplicationInitializer {
	@Override
	public void onStartup(ServletContext servletContext) throws ServletException {

	//1.初始化spring容器
	AnnotationConfigWebApplicationContext applicationContext = new AnnotationConfigWebApplicationContext();
	applicationContext.register(MVCConfig.class);
	applicationContext.setServletContext(servletContext);
	//2.设置核心控制器
	ServletRegistration.Dynamic springMVCServlet = servletContext.addServlet("springmvc", new DispatcherServlet(applicationContext));
	springMVCServlet.addMapping("*.action");
	springMVCServlet.setLoadOnStartup(2);

	}
	}

	HelloController代码:
	package com.Maynor.controller;

	import org.springframework.stereotype.Controller;
	import org.springframework.ui.Model;
	import org.springframework.web.bind.annotation.RequestMapping;

	@Controller
	public class HelloController {

	@RequestMapping(path = "/hello.action")
	public String show(Model model){

	model.addAttribute("data", "呵呵呵");

	return "/WEB-INF/show01.jsp";

	}


	}
	Show01.jsp
	<%@ page contentType="text/html;charset=UTF-8" language="java" %>
	<html>
	<head>
	<title>Title</title>
	</head>
	<body>

	来了老弟儿 ${data}

	</body>
	</html>

	public class Item {
	private String name; //名称
	private Float price; //价格
	private String detail; //详情

	@Controller
	@RequestMapping("/user")
	public class HelloController {

	@RequestMapping("showInfo")
	public String showInfo(Model model){
	System.out.println("展示页面");
	//1 模拟数据
	List<Item> list = new ArrayList<Item>();
	list.add(new Item("联想笔记本", 6999f, "ThinkPad T430 联想笔记本电脑！"));
	list.add(new Item("苹果手机", 8800f, "iphone X 苹果手机！"));

	//设置数据
	model.addAttribute("list", list);
	return "/showInfo.jsp";
	}
	}

	<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
	<%--
	Created by IntelliJ IDEA.
	User: 86153
	Date: 2019/6/14
	Time: 0:50
	To change this template use File \| Settings \| File Templates.
	--%>
	<%@ page contentType="text/html;charset=UTF-8" language="java" %>
	<html>
	<head>
	<title>Title</title>
	</head>
	<body>
	<table border="1">
	<tr>
	<td>名称</td>
	<td>价格</td>
	<td>描述</td>
	</tr>
	<c:forEach items="${list}" var="item">
	<tr>
	<td>${item.name }</td>
	<td>${item.price }</td>
	<td>${item.detail }</td>
	</tr>
	</c:forEach>
	</table>
	</body>
	</html>

	*MVCConfig
	@Configuration
	@ComponentScan("com.Maynor.controller")
	public class MVCConfiguration {

	}


	WebInitalizer
	public class WebInitializer implements WebApplicationInitializer {

	@Override
	public void onStartup(ServletContext servletContext) throws ServletException {
	//1 初始化spring容器
	AnnotationConfigWebApplicationContext appliation = new AnnotationConfigWebApplicationContext();
	appliation.register(MVCConfiguration.class);
	appliation.setServletContext(servletContext);

	//3 前端控制器
	ServletRegistration.Dynamic springMvcServlet = servletContext.addServlet("springmvc", new DispatcherServlet(appliation));
	springMvcServlet.addMapping("*.action");
	springMvcServlet.setLoadOnStartup(2);

	}

	}

	<org.springframework.version>4.2.4.RELEASE</org.springframework.version>

	<dependencies>
	<!-- spring start -->

	<!--spring core start-->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-beans</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-core</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-context</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-expression</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-context-support</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<!--spring core end-->

	<!--spring aop start-->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-aop</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<!--spirng aop end-->

	<!--spring aspects start-->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-aspects</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<!--spring aspects end-->

	<!--spring instrumentation start -->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-instrument</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<!--spring instrumentation end-->

	<!--spring messaging start -->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-messaging</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<!--spring messaging end-->

	<!--spring data access start -->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-jdbc</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-orm</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-oxm</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-jms</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-tx</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<!--spring data access end-->

	<!--spring web start -->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-websocket</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-web</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>


	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-webmvc-portlet</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>

	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-webmvc</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>
	<!--spring web end -->

	<!--spring test start -->
	<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-test</artifactId>
	<version>${org.springframework.version}</version>
	</dependency>

	<!--spring test end -->
	<!-- spring end -->


	<dependency>
	<groupId>junit</groupId>
	<artifactId>junit</artifactId>
	<version>4.12</version>
	<scope>test</scope>
	</dependency>
	<dependency>
	<groupId>tk.mybatis</groupId>
	<artifactId>mapper</artifactId>
	<version>3.5.2</version>
	</dependency>
	<dependency>
	<groupId>com.github.pagehelper</groupId>
	<artifactId>pagehelper</artifactId>
	<version>3.7.5</version>
	</dependency>
	<dependency>
	<groupId>org.mybatis</groupId>
	<artifactId>mybatis</artifactId>
	<version>3.4.5</version>
	</dependency>

	<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.47</version>
	</dependency>
	<dependency>
	<groupId>org.mybatis</groupId>
	<artifactId>mybatis-spring</artifactId>
	<version>1.3.2</version>
	</dependency>
	<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.1.10</version>
	</dependency>

	<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>javax.servlet-api</artifactId>
	<version>3.1.0</version>
	<scope>provided</scope>
	</dependency>


	<dependency>
	<groupId>jstl</groupId>
	<artifactId>jstl</artifactId>
	<version>1.2</version>
	</dependency>


	<dependency>
	<groupId>javax.servlet.jsp</groupId>
	<artifactId>jsp-api</artifactId>
	<version>2.1</version>
	<scope>provided</scope>
	</dependency>

	</dependencies>


	<!-- jdk版本插件 -->
	<plugin>
	<groupId>org.apache.maven.plugins</groupId>
	<artifactId>maven-compiler-plugin</artifactId>
	<version>3.2</version>
	<configuration>
	<source>1.8</source>
	<target>1.8</target>
	<encoding>UTF-8</encoding>
	<showWarnings>true</showWarnings>
	</configuration>
	</plugin>

	<!-- tomcat7插件 -->
	<plugin>
	<groupId>org.apache.tomcat.maven</groupId>
	<artifactId>tomcat7-maven-plugin</artifactId>
	<version>2.1</version>
	<configuration>
	<port>8081</port>
	<server>tomcat7</server>
	</configuration>
	</plugin>

	CREATE TABLE t_user (

	uid INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,

	login_name VARCHAR(50) DEFAULT NULL,

	login_pwd VARCHAR(32) DEFAULT NULL,

	age INT(11) DEFAULT NULL,

	birthday DATE DEFAULT NULL,

	sex VARCHAR(1) DEFAULT NULL,

	education VARCHAR(50),

	telephone VARCHAR(11),

	interest VARCHAR(100),

	remark VARCHAR(200)

	)
	insert into `t_user`(`uid`,`login_name`,`login_pwd`,`age`,`birthday`,`sex`,`education`,`telephone`,`interest`,`remark`) values (1,'jack','1234',18,'1996-11-11','男',NULL,NULL,NULL,NULL),(2,'rose','1234',21,'1993-11-11','女',NULL,NULL,NULL,NULL),(3,'tom','1234',23,'1996-12-24','男',NULL,NULL,NULL,NULL);

	@Table(name="t_user")
	public class User {
	@Id
	private Integer uid;
	private String loginName;
	private String loginPwd;
	private Integer age;
	private String sex;
	private String birthday;
	private String education;
	private String telephone;
	private String interest; //爱好：对应数据库（内容：A,B,C）
	private String[] interestArr; //爱好：对应页面表单
	private String remark;

	public String getInterest() {
	if(interestArr != null){
	interest = Arrays.toString(interestArr); //[A,B,C]
	interest = interest.substring(1, interest.length() - 1); //A,B,C
	}
	return interest;
	}
	public void setInterest(String interest) {
	this.interest = interest;
	if(interest != null){
	interestArr = interest.split(", ");
	}
	}

	package com.Maynor.dao;

	import com.Maynor.domain.User;
	import tk.mybatis.mapper.common.Mapper;

	public interface UserMapper extends Mapper<User> {
	}

	package com.Maynor.service;

	import com.Maynor.domain.User;

	import java.util.List;

	public interface UserService {

	public List<User> findAll();

	}

	package com.Maynor.service.impl;

	import com.Maynor.dao.UserMapper;
	import com.Maynor.domain.User;
	import com.Maynor.service.UserService;
	import org.springframework.stereotype.Service;
	import org.springframework.transaction.annotation.Transactional;
	import tk.mybatis.mapper.common.Mapper;

	import javax.annotation.Resource;
	import java.util.List;

	@Service(value = "userServiceImpl")
	@Transactional
	public class UserServiceImpl implements UserService {


	@Resource
	private UserMapper userMapper;

	@Override
	public List<User> findAll() {

	List<User> users = userMapper.selectAll();

	return users;
	}
	}

	package com.Maynor.config;

	import com.alibaba.druid.pool.DruidDataSource;
	import org.springframework.beans.factory.annotation.Value;
	import org.springframework.context.annotation.Bean;
	import org.springframework.context.annotation.ComponentScan;
	import org.springframework.context.annotation.Configuration;
	import org.springframework.context.annotation.PropertySource;
	import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
	import org.springframework.jdbc.datasource.DataSourceTransactionManager;
	import org.springframework.transaction.annotation.EnableTransactionManagement;
	import org.springframework.transaction.annotation.TransactionManagementConfigurer;
	import org.springframework.web.bind.annotation.RequestMapping;

	import javax.annotation.Resource;
	import javax.sql.DataSource;

	//配置类
	@Configuration
	//要扫描的包
	@ComponentScan(basePackages = {"com.Maynor"})
	//开启事务支持
	@EnableTransactionManagement
	//读取properties配置文件
	@PropertySource(value = "classpath:db.properties")
	public class SpringConfig {

	//4.2.4 读取properties的固定代码
	@Bean
	public static PropertySourcesPlaceholderConfigurer create(){

	return new PropertySourcesPlaceholderConfigurer();
	}
	//读取数据库中的相关配置
	@Value("${jdbc.driver}")
	private String driverClass;
	@Value("${jdbc.url}")
	private String url;
	@Value("${jdbc.username}")
	private String username;
	@Value("${jdbc.password}")
	private String password;


	//设置德鲁伊连接池
	@Bean
	public DataSource dataSource(){
	DruidDataSource dataSource = new DruidDataSource();
	dataSource.setPassword(password);
	dataSource.setUsername(username);
	dataSource.setUrl(url);
	dataSource.setDriverClassName(driverClass);
	return dataSource;
	}
	//开启事务管理器
	@Bean
	@Resource
	public DataSourceTransactionManager txManager(DataSource dataSource){
	return new DataSourceTransactionManager(dataSource);
	}
	}

	@Controller
	@RequestMapping("/user")
	public class ItemsController {

	@RequestMapping("/itemsList")
	public String itemsList(Model model) throws Exception {

	//1 模拟数据
	List<Items> list = new ArrayList<Items>();
	list.add(new Items("联想笔记本", 6999f, "ThinkPad T430 联想笔记本电脑！"));
	list.add(new Items("苹果手机", 8800f, "iphone X 苹果手机！"));

	//设置数据
	model.addAttribute("list", list);

	return "itemslist"; //"/WEB-INF/jsp/itemslist.jsp";
	}

	}

	JSP页面
	<form action="${pageContext.request.contextPath}/user/additems.action" method="post">
	姓名：<input type="text" name="name"/> <br/>
	价格：<input type="text" name="price"/> <br/>
	<input type="submit" value="提交" />
	</form>
	控制器：
	@Controller
	@RequestMapping("/user")
	public class ItemsController {

	@RequestMapping("additems")
	public String addItems(Items items){
	System.out.println(items);
	return "itemslist";
	}
	}

❤️最后的大爆发❤️五万字总结SpringMVC教程——三部曲封神之作（建议收藏）

1. Spring MVC 概述

2.1 Spring MVC是什么

1.0 Spring MVC处理流程

2. 入门案例：查询详情 ( xml）

3.1 需求说明

2.1 思路分析

2.2 实现步骤

2.2.1 拷贝配置文件相关代码

2.2.2 创建java类和jsp文件

3. 入门查询：查询所有（无xml）

3.2 需求说明

3.1 思路分析

3.2 步骤实现

3.2.1 拷贝pom文件,创建MVCConfig和WebInitializer类

3.2.2 创建HelloController和show01.jsp

4. SSM整合:改造UMS

4.1 搭建环境

4.0.1 创建项目、 拷贝pom文件

4.0.2 拷贝UMS页面

4.0.3 配置文件

4.0.4 初始化数据库和表

4.0.5 创建JavaBean

4.1 编写功能：dao、service、web、jsp页面

4.1.1 编写mapper接口（dao）

4.1.2 编写service接口

4.1.3 编写service实现类

4.1.4 编写Controller

4.1.5 编写jsp

4.2 编写配置类

4.2.1 spring配置类

4.2.2 mybatis配置类

4.2.3 spring mvc 配置类【无内容】

4.2.4 web启动配置类【新内容】

4.3 测试

5. 视图 解析器

5.1 分析

5.2 修改代码

5.2.1 编写控制器

5.2.2 配置视图解析器

6. SSM整合：改造UMS（添加视图解析器）

7. 参数 绑定

7.1 简单数据类型

7.1.1 支持的数据类型

7.1.2 @RequestParam

7.2 绑定POJO类型

7.3 POST中文乱码

7.4 绑定包装POJO

7.5 自定义参数绑定

7.6 绑定数组

7.7 表单数据绑定到List

8. @RequestMapping

8.1 多路径映射

8.2 窄化请求路径

8.3 请求方法限定

9. Controller方法返回值

9.1 返回ModelAndView

9.2 返回void

9.3 返回字符串

9.3.1 逻辑视图名

9.3.2 Redirect重定向

9.3.3 forward转发

10. 异常处理器

10.1 异常处理器分析

10.2 自定义异常

10.3 异常处理器编写

10.4 异常页面

10.5 测试程序

11. 上传图片

11.1 单图片上传

11.1.1 JSP页面

11.1.2 文件上传解析器

11.1.3 Controller实现

11.2 多图片上传

11.2.1 JSP页面

11.2.2 JavaBean

11.2.3 Controller实现

12. JSON数据交互

12.1 概述

12.2 前端发送ajax请求,后端获取json数据

4.0.1 创建项目、拷贝pom文件

5. 视图解析器

7. 参数绑定

14.3 自定义拦截器

14.4.3 注册拦截器

	在web.xml文件中
	<filter>
	<filter-name>encodingFilter</filter-name>
	<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
	<init-param>
	<param-name>encoding</param-name>
	<param-value>UTF-8</param-value>
	</init-param>
	<init-param>
	<param-name>forceEncoding</param-name>
	<param-value>true</param-value>
	</init-param>
	</filter>
	<filter-mapping>
	<filter-name>encodingFilter</filter-name>
	<url-pattern>/*</url-pattern>
	</filter-mapping>
	我们采用web启动配置类的方式
	@Override
	public void onStartup(ServletContext servletContext) throws ServletException {
	//1 初始化spring容器
	AnnotationConfigWebApplicationContext appliation = new AnnotationConfigWebApplicationContext();
	appliation.register(MVCConfiguration.class);
	appliation.setServletContext(servletContext);

	//2 post乱码配置
	FilterRegistration.Dynamic encodingFilter = servletContext.addFilter("CharacterEncodingFilter", new CharacterEncodingFilter("UTF-8"));
	encodingFilter.addMappingForUrlPatterns(null, true, "/*");

	//3 前端控制器
	ServletRegistration.Dynamic springMvcServlet = servletContext.addServlet("springmvc", new DispatcherServlet(appliation));
	springMvcServlet.addMapping("*.action");
	springMvcServlet.setLoadOnStartup(2);

	}

	提供JavaBean：QueryVo
	public class QueryVo {
	private Items items;

	public Items getItems() {
	return items;
	}

	public void setItems(Items items) {
	this.items = items;
	}
	}
	修改控制器
	@RequestMapping("findall")
	public String findAll(QueryVo queryVo){
	System.out.println(queryVo.getItems());
	return "itemslist";
	}
	JSP页面
	<form action="${pageContext.request.contextPath}/user/findall.action" method="post">
	姓名：<input type="text" name="items.name"/> <br/>
	价格：<input type="text" name="items.price"/> <br/>
	<input type="submit" value="提交findall" />
	</form>

	JavaBean
	public class QueryVo {
	private Items items;
	private Date createDate;
	JSP页面
	<form action="${pageContext.request.contextPath}/user/findall2.action" method="post">
	姓名：<input type="text" name="items.name"/> <br/>
	价格：<input type="text" name="items.price"/> <br/>
	日期：<input type="text" name="createDate"/> <br/>
	<input type="submit" value="提交findall2" />
	</form>
	控制器
	@RequestMapping("findall2")
	public String findAll2(QueryVo queryVo){
	System.out.println(queryVo.getItems());
	System.out.println(queryVo.getCreateDate());
	return "itemslist";
	}

	@RequestMapping(value={"/index","/index2"})
	public String index(){
	return "itemslist";
	}

	http://localhost:8080/spring_mvc_day01_05/user/index.action
	http://localhost:8080/spring_mvc_day01_05/user/index2.action
	//都可以访问

	@RequestMapping("/findById")
	public ModelAndView findById(){
	ModelAndView modelAndview = new ModelAndView();
	//设置数据
	modelAndview.addObject("id", "猜猜看");
	//设置视图
	modelAndview.setViewName("itemslist");
	return modelAndview;
	}

	请求转发
	@RequestMapping("/findById2")
	public void findById2(HttpServletRequest request , HttpServletResponse response)
	throws ServletException, IOException{
	request.getRequestDispatcher("/index.jsp").forward(request, response);
	}
	重定向
	@RequestMapping("/findById3")
	public void findById3(HttpServletRequest request , HttpServletResponse response)
	throws ServletException, IOException{
	response.sendRedirect(request.getContextPath() + "/index.jsp");
	}
	Json 处理
	@RequestMapping("/findById4")
	public void findById4(HttpServletRequest request , HttpServletResponse response)
	throws ServletException, IOException{
	response.setCharacterEncoding("UTF-8");
	response.setContentType("application/json;charset=UTF-8");
	String jsonStr = "{\"username\":\"jack\"}";
	response.getWriter().write(jsonStr);
	}

	return "redirect:其他路径";

	@RequestMapping("/update")
	public String update() throws ServletException, IOException{
	return "redirect:queryItem.action";
	}

	return "forward:其他路径";
	@RequestMapping("/updateSubmit")
	public String updateSubmit() throws ServletException, IOException{
	return "forward:editItem.action";
	}

	public class CustomException extends Exception {

	private static final long serialVersionUID = 8222256702797084775L;

	public CustomException() {
	super();
	}

	public CustomException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
	super(message, cause, enableSuppression, writableStackTrace);
	}

	public CustomException(String message, Throwable cause) {
	super(message, cause);
	}

	public CustomException(String message) {
	super(message);
	}

	public CustomException(Throwable cause) {
	super(cause);
	}

	}

	<body>
	您的操作出现错误如下：<br/>
	${message }
	</body>