MultipartBody文件上传

RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", fileName, RequestBody.create(MediaType.parse("multipart/form-data"), new File(filePath)))
        .addFormDataPart().addFormDataPart().addFormDataPart()
        .build();
//发出请求参数
Request request = new Request.Builder().addHeader("Content-Type", "application/x-www-form-urlencoded").url(url).post(requestBody).build();
Call call = createClient().newCall(request);
call.enqueue(callback);