目录
- springboot上传文件并返回url
- springboot上传文件两种方式
springboot上传文件并返回url
1.首先在yml中配置文件上传地址
2.文件保存本地没有配置在服务器上 需要多写一个api,在上传的最后生成一个url
直接上代码
@Slfj
@Service
public class StuEmailPhotoServiceImpl implements StuEmailPhotoService {
@Value("${file.email_img_url}")
String imageUrl;
@Value("${img.url}")
String imgUrl;
@Resource
StuEmailPhotoMapper stuEmailPhotoMapper;
/**
* 邮件上传图片
*
* @param classId
* @param file
* @param request
* @return
*/
@Override
public ResultImg batchUpload(Long classId, MultipartFile file, HttpServletRequest request) {
if (null == file) {
return new ResultImg(ResultInfo.FAIL_CODE, "传入文件为空！");
}
String errMsg = null;
String newName = null;
try {
String oldName = file.getOriginalFilename().toLowerCase(); //获取图片的名称
String imgPath = null;
newName = classId + "-emailTemplate-" + UUID.randomUUID() + oldName.substring(oldName.lastIndexOf("."));
imgPath = imageUrl + classId; // + "/" + newName
File folder = new File(imgPath);
//没有文件夹就创建
if (!folder.exists()) {
folder.mkdirs();
}
//压缩图片再保存outputQuality(f) 越接近1，图片质量越高
String suffix = oldName.substring(oldName.lastIndexOf(".") +);
Thumbnails.of(file.getInputStream()).scale(f).outputQuality(1f).outputFormat(suffix).toFile(new File(folder, newName));
//存储图片信息
StuEmailPhoto stuEmailPhoto = new StuEmailPhoto();
stuEmailPhoto.setClassId(classId);
stuEmailPhoto.setImgOname(oldName);
stuEmailPhoto.setImgName(newName);
stuEmailPhoto.setImgUrl(imgPath + "/" + newName);
stuEmailPhoto.setCreateTime(DateFormatUtils.getCurrentTime());
stuEmailPhoto.setCreator(SecurityUtils.getCurrentUserId());
stuEmailPhotoMapper.insert(stuEmailPhoto);
} catch (Exception e) {
errMsg = e.getLocalizedMessage();
log.error("------StuPlatTrans--------batchUpload-----------:" + e);
}
if (StringUtils.isNotEmpty(errMsg)) {
return new ResultImg(ResultInfo.FAIL_CODE, errMsg);
}
String url = imgUrl + "api/selectData/readImageView/emailTemplate/" + classId + "/" + newName;
ImgUrl imgUrl = new ImgUrl();
imgUrl.setUrl(url);
List<ImgUrl> urlList = new ArrayList();
urlList.add(imgUrl);
return new ResultImg(, urlList);
}
/**
* 浏览器读取图片
*
* @param classId
* @param imgName
* @param request
* @param response
*/
@Override
public void readImageView(Long classId, String imgName, HttpServletRequest request, HttpServletResponse response) {
log.info("----------调用邮箱readImageView方法---------------");
ServletOutputStream outputStream = null;
FileInputStream inputStream = null;
try {
//获取图片存放路径
String imgPath = null;
StuEmailPhoto stuEmailPhoto = stuEmailPhotoMapper.getUrlByNameAndClassId(classId, imgName);
imgName = stuEmailPhoto.getImgName();
String suffix = imgName.substring(imgName.lastIndexOf(".") +);
// StuPlatTransfer transfer = transferMapper.getImageUrlByName(java.net.URLDecoder.decode(imgName, "utf-") );
log.info(JsonHelper.toJsonString(stuEmailPhoto));
imgPath = stuEmailPhoto.getImgUrl();
if (null != imgPath) {
File imgFile = new File(imgPath);
if (!imgFile.exists()) {
return;
}
// response.setContentType("application/octet-stream; charset=utf-");
response.addHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
response.addHeader("Access-Control-Expose-Headers", "token,uid,Content-Disposition");
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
response.addHeader("Access-Control-Allow-Headers", "Content-Type");
response.addHeader("Access-Control-Allow-Credentials", "true");
response.addHeader("Content-Length", "" + imgFile.length());
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires",);
inputStream = new FileInputStream(imgFile);
response.setContentType("image/" + suffix + ";charset=utf-");
outputStream = response.getOutputStream();
//读取文件流
int len =;
byte[] buffer = new byte[ * 10];
while ((len = inputStream.read(buffer)) != -) {
outputStream.write(buffer,, len);
}
outputStream.flush();
}
} catch (Exception e) {
log.error("-----readImageView---imageName--" + imgName + "--err:" + e);
} finally {
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException e) {
log.error("-----readImageView---input close--" + imgName + "--e:" + e);
}
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
log.error("-----readImageView---out close--" + imgName + "--e:" + e);
}
}
}
}
springboot上传文件两种方式
1.文件保存在服务器，url地址保存在数据库
/**
*.文件保存在服务器，url地址保存在数据库
* 上传成功之后返回成功保存的url地址
*/
@PostMapping("/upload")
public @ResponseBody String upload(@RequestParam MultipartFile file, HttpServletRequest request){
if(!file.isEmpty()){
String uploadPath = "C:\uploadFile";
// 如果目录不存在则创建
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
String OriginalFilename = file.getOriginalFilename();//获取原文件名
String suffixName = OriginalFilename.substring(OriginalFilename.lastIndexOf("."));//获取文件后缀名
//重新随机生成名字
String filename = UUID.randomUUID().toString() +suffixName;
File localFile = new File(uploadPath+"\"+filename);
try {
file.transferTo(localFile); //把上传的文件保存至本地
/**
* 这里应该把filename保存到数据库,供前端访问时使用
*/
return filename;//上传成功，返回保存的文件地址
}catch (IOException e){
e.printStackTrace();
System.out.println("上传失败");
return "";
}
}else{
System.out.println("文件为空");
return "";
}
}
2.直接把文件以二进制形式保存到数据库中数据类型为blob的一个字段
/**
*上传图片，使用mybatis-plus保存到数据库
*User为实体类，数据库对应user表，有id、image两个属性
*/
@PostMapping("/upload")
@ResponseBody
public String upload(@RequestParam("file") MultipartFile file) throws Exception{
if(!file.isEmpty()){
User user=new User();
user.setImage(file.getBytes());
userMapper.insert(user);
}
return "ok";
}
/**
*前端通过id获取数据库中的图片
*/
@GetMapping("/getImage")
@ResponseBody
public void getImage(String id,HttpServletResponse resp) throws Exception{
User user=userMapper.selectById(id);
byte[] image = (byte[])user.getImage();
resp.setContentType("image/jpeg");
ServletOutputStream out = resp.getOutputStream();
out.write(image);
out.flush();
out.close();
}
3.前端代码
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="file" /><br/>
<input type="submit" name="" id="" value="提交" />
</form>