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 ， RequestBodyrequestBody.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() {@Overridepublic void onFailure(Call call, IOException e) {}@Overridepublic 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);}});