springboot 之集成Redis

Java
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0
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2023-03-03

前言

一直没机会做spring生态圈的框架,公司选择的是一些小众的微服务,鉴于此考虑,丰富自己的技术栈,花了两天时间从网上各网站上学习了springboot一些基础知识。 本章只介绍springboot微服务集成redis,用于存放或访问项目中用到的缓存数据库。

环境准备

  • IntelliJ IDEA
  • 前一章中搭建的微服务框架

开始集成

  1. pom.xml中增加依赖包

img

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
  1. 在application.yml中配置redis服务连接信息:

img

spring:
  #日志记录模式
  profiles:
    active: dev
  banner:
    charset: "UTF-8"
    location: classpath:/banner.txt
  datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: xxx
    driver-class-name: com.mysql.cj.jdbc.Driver
  redis:
    #url: redis://user:password@example.com:6379
    #redis机器ip
    host: 127.0.0.1
    #redis端口
    port: 6379
    #redis密码
    password:
    #redis超时时间(毫秒),如果不设置,取默认值2000
    timeout: 10000
    jedis:
      pool:
        #最大空闲数
        maxIdle: 300
        #连接池的最大数据库连接数。设为0表示无限制,如果是jedis 2.4以后用redis.maxTotal
        maxActive: 600
        #控制一个pool可分配多少个jedis实例,用来替换上面的redis.maxActive,如果是jedis 2.4以后用该属性
        #maxTotal: 1000
        #最大建立连接等待时间。如果超过此时间将接到异常。设为-1表示无限制。
        maxWait: 1000
        #连接的最小空闲时间 默认1800000毫秒(30分钟)
        #minEvictableIdleTimeMillis: 300000
        #每次释放连接的最大数目,默认3
        #numTestsPerEvictionRun: 1024
        #逐出扫描的时间间隔(毫秒) 如果为负数,则不运行逐出线程, 默认-1
        timeBetweenEvictionRuns: 30000
        #是否在从池中取出连接前进行检验,如果检验失败,则从池中去除连接并尝试取出另一个
        #testOnBorrow: true
        #在空闲时检查有效性, 默认false
        #testWhileIdle: true
  1. 在demo包下编写redis配置类,用于接收并解析yml中所配置的redis服务信息,并可以构建redis模板,redis连接工厂:

img

package com.example.demo;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.io.Serializable;

/**
 * 类功能描述:<br>
 * <ul>
 * <li>类功能描述1<br>
 * <li>类功能描述2<br>
 * <li>类功能描述3<br>
 * </ul>
 * 修改记录:<br>
 * <ul>
 * <li>修改记录描述1<br>
 * <li>修改记录描述2<br>
 * <li>修改记录描述3<br>
 * </ul>
 *
 * @author xuefl
 * @version 5.0 since 2020-01-02
 */
@Configuration
@AutoConfigureAfter(RedisAutoConfiguration.class)
public class RedisConfig {

    @Bean
    public RedisTemplate<String, Serializable> redisCacheTemplate(LettuceConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Serializable> template = new RedisTemplate<>();
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }
}
  1. 为了方便后续对Redis数据库中数据的操作,在util包下新增redis操作工具类:

img

package com.example.demo.util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.*;
import org.springframework.stereotype.Service;

import java.io.Serializable;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * 类功能描述:<br>
 * <ul>
 * <li>类功能描述1<br>
 * <li>类功能描述2<br>
 * <li>类功能描述3<br>
 * </ul>
 * 修改记录:<br>
 * <ul>
 * <li>修改记录描述1<br>
 * <li>修改记录描述2<br>
 * <li>修改记录描述3<br>
 * </ul>
 *
 * @author xuefl
 * @version 5.0 since 2020-01-02
 */
@Service
public class RedisUtil {
    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 写入缓存
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 写入缓存设置时效时间
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value, Long expireTime , TimeUnit timeUnit) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            redisTemplate.expire(key, expireTime, timeUnit);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 批量删除对应的value
     * @param keys
     */
    public void remove(final String... keys) {
        for (String key : keys) {
            remove(key);
        }
    }
    /**
     * 批量删除key
     * @param pattern
     */
    public void removePattern(final String pattern) {
        Set<Serializable> keys = redisTemplate.keys(pattern);
        if (keys.size() > 0){
            redisTemplate.delete(keys);
        }
    }
    /**
     * 删除对应的value
     * @param key
     */
    public void remove(final String key) {
        if (exists(key)) {
            redisTemplate.delete(key);
        }
    }
    /**
     * 判断缓存中是否有对应的value
     * @param key
     * @return
     */
    public boolean exists(final String key) {
        return redisTemplate.hasKey(key);
    }
    /**
     * 读取缓存
     * @param key
     * @return
     */
    public Object get(final String key) {
        Object result = null;
        ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
        result = operations.get(key);
        return result;
    }
    /**
     * 哈希 添加
     * @param key
     * @param hashKey
     * @param value
     */
    public void hmSet(String key, Object hashKey, Object value){
        HashOperations<String, Object, Object> hash = redisTemplate.opsForHash();
        hash.put(key,hashKey,value);
    }
    /**
     * 哈希获取数据
     * @param key
     * @param hashKey
     * @return
     */
    public Object hmGet(String key, Object hashKey){
        HashOperations<String, Object, Object>  hash = redisTemplate.opsForHash();
        return hash.get(key,hashKey);
    }
    /**
     * 列表添加
     * @param k
     * @param v
     */
    public void lPush(String k,Object v){
        ListOperations<String, Object> list = redisTemplate.opsForList();
        list.rightPush(k,v);
    }
    /**
     * 列表获取
     * @param k
     * @param l
     * @param l1
     * @return
     */
    public List<Object> lRange(String k, long l, long l1){
        ListOperations<String, Object> list = redisTemplate.opsForList();
        return list.range(k,l,l1);
    }
    /**
     * 集合添加
     * @param key
     * @param value
     */
    public void add(String key,Object value){
        SetOperations<String, Object> set = redisTemplate.opsForSet();
        set.add(key,value);
    }
    /**
     * 集合获取
     * @param key
     * @return
     */
    public Set<Object> setMembers(String key){
        SetOperations<String, Object> set = redisTemplate.opsForSet();
        return set.members(key);
    }
    /**
     * 有序集合添加
     * @param key
     * @param value
     * @param scoure
     */
    public void zAdd(String key,Object value,double scoure){
        ZSetOperations<String, Object> zset = redisTemplate.opsForZSet();
        zset.add(key,value,scoure);
    }
    /**
     * 有序集合获取
     * @param key
     * @param scoure
     * @param scoure1
     * @return
     */
    public Set<Object> rangeByScore(String key,double scoure,double scoure1){
        ZSetOperations<String, Object> zset = redisTemplate.opsForZSet();
        return zset.rangeByScore(key, scoure, scoure1);
    }
}
  1. 定义redis controller类,在controller包下编写RedisController类:

img

package com.example.demo.controller;
import com.example.demo.util.RedisUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * 类功能描述:<br>
 * <ul>
 * <li>类功能描述1<br>
 * <li>类功能描述2<br>
 * <li>类功能描述3<br>
 * </ul>
 * 修改记录:<br>
 * <ul>
 * <li>修改记录描述1<br>
 * <li>修改记录描述2<br>
 * <li>修改记录描述3<br>
 * </ul>
 *
 * @author xuefl
 * @version 5.0 since 2020-01-02
 */
@RestController
@RequestMapping("/redis")
@Api(value = "SwaggerValue", tags={"SwaggerController"},description = "swagger应用",  produces = MediaType.APPLICATION_JSON_VALUE)
public class RedisController {
    @Autowired
    private RedisUtil redisUtil;

    //添加
    @RequestMapping(value="/add", method = RequestMethod.GET)
    @ApiOperation(value="redis",httpMethod = "GET",notes="test set redis key",produces = MediaType.APPLICATION_JSON_VALUE)
    public boolean saveRedis(){
        return redisUtil.set("a","test");
    }

    //获取
    @GetMapping(value="/get")
    @ApiOperation(value="redis",httpMethod = "GET",notes="test get redis key",produces = MediaType.APPLICATION_JSON_VALUE)
    public Object getRedis(){
        return redisUtil.get("a");
    }
}

此类注入redisUtil工具类,引用其对数据的CURD方法,进行业务操作,然后定义相关的uri,用于http访问,此处只定义了两个:一个新增key-value、一个查询key。

  1. 启动DemoApplication类,访问swagger页面测试结果:

img

img