上传图片接口

项目中经常会遇到上传图片和头像 记录下接口

1. 上传头像
   逻辑:每个账号都只有一个头像 所以这里将每个账号的头像名称设为固定值，如User_(userid).jpg 这样 只需要上传此名称的图片 前天根据id获取就行

@ApiOperation(value = "上传用户头像",httpMethod = "POST", produces = "application/json")
    @ApiResponse(code = 200, message = "success", response = ResponseBase.class)
    @RequestMapping(value = "/uploadPortrait",method = RequestMethod.POST, produces = "application/json")
    public ResponseBase uploadPortrait(@RequestParam("file") MultipartFile file,HttpServletRequest request){
        String userid = request.getParameter("userid");
        File dir = new File(UPLOADED_File);
        if(!dir.exists()){
            dir.mkdir();
        }
        String fileName = "User_"+userid;
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String targetUploadPath = dir + File.separator + fileName + suffix;
        File imgurl = new File(targetUploadPath);
        if(imgurl.exists()){
            FileUtils.deleteQuietly(imgurl);
        }
        try {
            FileUtils.writeByteArrayToFile(new File(targetUploadPath), file.getBytes());
            return setResultSuccess();
        } catch (IOException e) {
            System.out.println(e.getStackTrace());
        }
        return setResultError("头像上传失败");
    }

2.文件上传 多图上传
逻辑 多张图片上传 图片名起初为uuid-test 当用户点击保存时 删除-test后缀 关联图片 这样要是发生异常情况 写个定时器 定期清理 -test后缀 冗余图片 可以大大减少垃圾图片

//处理文件上传
    @ApiOperation(value = "上传图片文件,支持多图片上传")
    @RequestMapping(value="/uploadImgs", method = RequestMethod.POST, produces = "application/json")
    public JSONArray uploadImgs(@ApiParam(name = "file", required = true, value = "file") @RequestParam("file") MultipartFile[] files){
        JSONArray res = new JSONArray();
        File flie = new File(UPLOADED_File);
        if(flie.exists()) {
            flie.mkdir();
        }
        for (int i = 0; i < files.length; i++) {
            MultipartFile file = files[i];
            String originalFilename = file.getOriginalFilename();
            String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
            String filename = UUID.randomUUID().toString().replaceAll("-", "") + "-test" + suffix;
            String targetUploadPath = flie + File.separator + filename;
            try {
                FileUtils.writeByteArrayToFile(new File(targetUploadPath), file.getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
            res.add(filename);
        }

        return res;
    }

3.获取图片
前端img url直接访问后端/getImages/图片名 即可显示图片

@ApiOperation(value = "获取图片", httpMethod = "GET", produces = "application/json")
    @ApiResponse(code = 200, message = "success", response = ResponseBase.class)
    @RequestMapping(value = "/getImages/{filename}", method = RequestMethod.GET, produces = "application/json")
    public void getImages(HttpServletResponse response, @PathVariable("filename") String filename) throws IOException {
        String path = UPLOADED_File + filename;
        File dir = new File(path);
        if(dir.exists()){
            byte[] bytes = FileUtils.readFileToByteArray(dir);
            OutputStream out = response.getOutputStream();
            out.write(bytes);
            out.flush();
            out.close();
        }
    }