java okhttp 发送图片

@RequestMapping(value="/demo2", method=RequestMethod.POST)
    @ResponseBody
    public String demo2(String fileName, MultipartFile myfile, HttpServletRequest request) throws IllegalStateException, IOException{

        String path = request.getServletContext().getRealPath("files");
        path += "/" + myfile.getOriginalFilename();
        File file = new File(path);
        myfile.transferTo(file);
         OkHttpClient client = new OkHttpClient();
            MediaType MEDIA_TYPE_TEXT = MediaType.parse("image/png");

            RequestBody requestBody = new MultipartBuilder()
                    .type(MultipartBuilder.FORM)
                    .addFormDataPart("title","测试图片")
                    .addFormDataPart("file",fileName, RequestBody.create(MEDIA_TYPE_TEXT, new File(path)))
                    .build();
            Request request1 = new Request.Builder()
                    .url("http://192.168.1.139:8080/a/upload/upload")
                    .post(requestBody)
                    .build();
            Response response = client.newCall(request1).execute();
            if (!response.isSuccessful()) {
                throw new IOException("服务器端错误: " + response);
            }

           /* System.out.println(response.body().string());*/
            System.out.println(fileName+" - 上传成功");
            return "success";
           }            

依赖的jar包：http://files.cnblogs.com/files/fengwenzhee/okhttp.rar