1. 封装HttpURLConnection的网络请求

• 首先定义一个接口作为网络请求结果的回调

///定义一个接口
public interface HttpCallbackListener {
    //网络请求成功时的回调
    void onFinish(String response);
    //网络请求失败时的回调
    void onError(Exception e);
}

• 然后封装网络请求的代码

public class HttpUtil {
    public static void sendHttpRequest(final String address, final HttpCallbackListener listener) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection = null;
                try {
                    URL url = new URL(address);
                    connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(8000);
                    connection.setReadTimeout(8000);
                    connection.setDoInput(true);
                    connection.setDoOutput(true);
                    InputStream in = connection.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
                    StringBuilder response = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) != null) {
                        response.append(line);
                    }
                    if (listener != null) {
                        //接收到服务器返回的数据，回调onFinish方法，将数据传出去
                        listener.onFinish(response.toString());
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    //请求出错，回调onError()方法
                    listener.onError(e);
                } finally {
                    if (connection != null) {
                        connection.disconnect();
                    }
                }
            }
        }).start();
    }
}

• 调用实例

String address = "http://10.0.2.2/get_data.json";
HttpUtil.sendHttpRequest(address, new HttpCallbackListener() {
                    @Override
                    public void onFinish(String response) {
                        //解析服务器返回的数据
                        parseJSONWithGSON(response);
                    }
                    @Override
                    public void onError(Exception e) {
                        //请求失败做的操作
                    }
                });

2. 封装OKHttp的网络请求

• 封装代码如下

    ///封装OKHttp的网络请求
    public static void sendOkHttpRequest(String address, okhttp3.Callback callback) {
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url(address)
                .build();
        client.newCall(request).enqueue(callback);
    }

• 调用实例

String address = "http://10.0.2.2/get_data.json";
               HttpUtil.sendOkHttpRequest(address, new Callback() {
                   @Override
                   public void onFailure(Call call, IOException e) {
                       //请求失败时调用
                   }
                   @Override
                   public void onResponse(Call call, Response response) throws IOException {
                       //收到服务器返回的数据调用
                       //收到服务器返回的数据调用
                       String responseData = response.body().string();
                       showRespons(responseData);
                   }
               });