android okHttp3 post上传图片给服务器

进行post请求

OkHttpClient client = new OkHttpClient();// form 表单形式上传MultipartBody.Builder requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM);if(file != null){    // MediaType.parse() 里面是上传的文件类型。    RequestBody body = RequestBody.create(MediaType.parse("image/*"), file);    String filename = file.getName();    // 参数分别为， 请求key ，文件名称 ， RequestBody    requestBody.addFormDataPart("file", filename, body).addFormDataPart("uid", String.valueOf(uid));}Request request = new Request.Builder().url(API.UpImg).post(requestBody.build()).build();// readTimeout("请求超时时间" , 时间单位);client.newBuilder().readTimeout(5000, TimeUnit.MILLISECONDS).build().newCall(request).enqueue(new Callback() {    @Override    public void onFailure(Call call, IOException e) {            }    @Override    public void onResponse(Call call, Response response) throws IOException {        String string = response.body().string();        Message message = new Message();        message.what = 0;        message.obj = string;        handler.sendMessage(message);    }});