SpringBoot单文件上传和多文件上传

1.单文件上传

/**
     * 单文件上传
     */
    @PostMapping("/upload")
    public String upload(MultipartFile file, HttpServletRequest req){
        SimpleDateFormat sdf =  new SimpleDateFormat("/yyy/MM/dd/");
        //按照日期创建文件夹保存文件
        String format = sdf.format(new Date());
        //图片保存路径  图片保存在tomcat临时目录
        String realPath  =  req.getServletContext().getRealPath("/img")+ format;
        File folder = new File(realPath);
        //如果文件夹是空就创建文件夹
        if (!folder.exists()){
            folder.mkdirs();
        }
        //获取文件名
        String oldFilename = file.getOriginalFilename();
        //生成新的文件名
        String newName = UUID.randomUUID().toString()+ oldFilename.substring(oldFilename.lastIndexOf("."));
        try {
            //保存文件
            file.transferTo(new File(folder,newName));
            //返回图片路径
            String url = req.getScheme()+"://"+req.getServerName()+":"+req.getServerPort()+"/img"+format+newName;
            return url;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return  "error";
    }
     

2.多文件上传

/**
     * 多文件上传
     * @param files
     * @param req
     * @return
     */
    @PostMapping("/uploads")
    public String uploads(MultipartFile[] files, HttpServletRequest req) {
        String format = sdf.format(new Date());
        String realPath = req.getServletContext().getRealPath("/img") + format;
        File folder = new File(realPath);
        if (!folder.exists()) {
            folder.mkdirs();
        }
        for (MultipartFile file : files) {
            String oldName = file.getOriginalFilename();
            String newName = UUID.randomUUID().toString() + oldName.substring(oldName.lastIndexOf("."));
            try {
                file.transferTo(new File(folder, newName));
                String url = req.getScheme() + "://" + req.getServerName() + ":" + req.getServerPort() + "/img" + format + newName;
                System.out.println(url);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return "success";
    }