springboot上传文件的两种方式

springboot上传文件的两种方式 1.文件保存在服务器，url地址保存在数据库

	
@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
                
                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

@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";
    }

    @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