求大哥们帮忙 新手okhttp的上传图片问题

[1215zhuc]

我在Android端想用 okhttp 向服务器端上传图片 qqq.png 那么我在后端用servlet的话应该怎么接收这张图片并把它存下来？

MultipartBody.Builder multipartBuilder=new MultipartBody.Builder();
RequestBody requestBody=multipartBuilder.setType(MultipartBody.FORM)
.addFormDataPart("username","qqq")
.addFormDataPart("password","123")
.addFormDataPart("mPhoto","qqq.png",RequestBody.create(MediaType.parse("application/octet-stream"),file))
.build();