private void getService() {
       OkHttpClient client = new OkHttpClient();
 
       //请求超时设置
       client.newBuilder()
               .connectTimeout(10, TimeUnit.SECONDS)
               .readTimeout(20, TimeUnit.SECONDS).build();
 
       Request.Builder request = new Request.Builder().url("URL");
       Call call = client.newCall(request.build());
       call.enqueue(new Callback() {
           @Override
           public void onFailure(Call call, IOException e) {
               if (e instanceof SocketTimeoutException) {
                   //判断超时异常
               }
               if (e instanceof ConnectException) {
                   ////判断连接异常，
 
               }
           }
 
           @Override
           public void onResponse(Call call, Response response) throws IOException {
 
           }
       });
   }

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