使用Okhttp上传图片

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写项目的时候接触了上传图片这个模块。第一次使用OKhttputils上传图片时发现有时候上传成功，有时候失败报500错误，我纠结了一天，用postman测试接口是没有问题的，最后换回原生的okhttp框架去写。后来发现可能是之前的OKhttputils版本太低了导致的（2.6.2），现在用的Okhttp版本是（3.2.0）

private static final String TAG = "MainActivity";private Button btn_up;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    btn_up = (Button) findViewById(R.id.btn_up);    btn_up.setOnClickListener(this);}private void upImage() {    OkHttpClient mOkHttpClent = new OkHttpClient();    File file = new File(Environment.getExternalStorageDirectory()+"/HeadPortrait.jpg");    MultipartBody.Builder builder = new MultipartBody.Builder()            .setType(MultipartBody.FORM)            .addFormDataPart("img", "HeadPortrait.jpg",                    RequestBody.create(MediaType.parse("image/png"), file));    RequestBody requestBody = builder.build();    Request request = new Request.Builder()            .url(url)            .post(requestBody)            .build();    Call call = mOkHttpClent.newCall(request);    call.enqueue(new Callback() {        @Override        public void onFailure(Call call, IOException e) {            Log.e(TAG, "onFailure: "+e );            runOnUiThread(new Runnable() {                @Override                public void run() {                    Toast.makeText(MainActivity.this, "失败", Toast.LENGTH_SHORT).show();                }            });        }        @Override        public void onResponse(Call call, Response response) throws IOException {            Log.e(TAG, "成功"+response);            runOnUiThread(new Runnable() {                @Override                public void run() {                    Toast.makeText(MainActivity.this, "成功", Toast.LENGTH_SHORT).show();                }            });        }    });}@Overridepublic void onClick(View v) {    Log.e(TAG, "onClick: " );    new Thread(new Runnable() {        @Override        public void run() {            upImage();        }    }).start();}

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