springmvc的上傳功能

springmvc 的上傳功能，比較簡單。記錄下

```
 @RequestMapping("doUpload")
     public String UploadFile(HttpServletRequest request,
     @RequestParam(value = "file", required = false)MultipartFile multipartFile){
     //獲取上傳路徑
      String savePath = request.getSession().getServletContext().getRealPath("upload");
        System.out.println("獲取文件名 " + multipartFile.getOriginalFilename());
        //獲取文件名
        String filename = multipartFile.getOriginalFilename();
        if (StringUtils.isEmpty(filename)){
            return  "err.html";
        }else{
            //獲取完整路徑名，包含文件名
            //  String path = savePath + File.separator + filename;
            //建立上傳存放文件夾
            File upFile = new File(savePath,filename);
            //    System.out.println("path:" + path + "  ");
            //  File file = new File(savePath);
            //判斷上傳文件是否存在
            if (!upFile.exists() && !upFile.isDirectory()){
                System.out.println("目錄不存在，咱建立個");
                // file.mkdir();
                upFile.mkdirs();
            }
            try {
            //上傳
                multipartFile.transferTo(upFile);
                upFile.delete();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return  "index.html";
        }