Android 自定义网络加载工具类 HttpURLConnectionUtils

代码已经上传到github，欢迎Star。

https://github.com/MZCretin/HttpUrlConnectionUtilDemo

CSDN地址：http://blog.csdn.net/u010998327/article/details/65443615

一个自己封装的用HttpUrlConnection请求的网络工具类，但只适合新手研究或者做些小demo用下，毕竟现在对于Android开发的网络框架有很多，而且很好很强大。

目前支持的功能：

1、GET，POST请求

2、支持返回String，Byte[]数组，以及自定义的Model类

3、请求的回调已处理过，现在的回调在UI线程，所以可以直接更新UI

同样的，如果写demo啥的，可以按照以下方式依赖进项目：

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}
    
dependencies {
            compile 'com.github.MZCretin:HttpUrlConnectionUtilDemo:v1.0'
}

后面如果有需要，我会加上下载文件的方法。

如果有啥问题，欢迎交流：

792075058

[email protected]

正文

最近吃腻了外卖，想着自己做饭吃，所以就自己做了一个菜谱的小软件，从api服务上找了一个菜谱的接口就开始做了，在做的过程中，需要请求一个接口，来获取菜谱信息，于是就想到Android现在很火的各种网络框架。。。在选择的时候就犯难了，我就写个软件自己用，就简单的请求一个接口，有必要用这么重的框架么。然后就开始了主题所说的自定义一个简单的网络加载工具类。
我这边只是做了一个简单的封装。
首先：定义一个 static ExecutorService threadPool = Executors.newCachedThreadPool()，来创建一个可根据需要创建新线程的线程池，但是在以前构造的线程可用时将重用它们。因为不能在主线程请求网络，所以用这个线程池来装载我们用于进行网络请求的线程，定义一个static Gson gson = new Gson();用来将请求的json数据转换成对应的Model对象。
然后：定义第一个方法，也就是返回字符串的方法。在这个方法里，上面有关HttpURLConnection的操作都是一样的，不一样的是最后对流的处理，这个方法要求返回的是字符串，所以我们在获取到流的时候将其转化成我们需要的字符串，再通过回调给调用者，其他goGet方法也一样，如果需要byte数组，我们就返回byte数组，如果需要对象，我们就先转成String字符串，然后通过gson将json字符串转换成对应的对象返回即可。（具体请看源码，下面会贴出源码）

doGet方法

 /**
     * GET方法 返回数据会解析成字符串String
     * @param context 上下文
     * @param urlString 请求的url
     * @param listener 回调监听
     */
    public static void doGet(final Context context, final String urlString,
                             final HttpCallbackStringListener listener) {
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url;
                HttpURLConnection httpURLConnection = null;
                try {
                    // 根据URL地址创建URL对象
                    url = new URL(urlString);
                    // 获取HttpURLConnection对象
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();
                    // 设置请求方式，默认为GET
                    httpURLConnection.setRequestMethod("GET");
                    // 设置连接超时
                    httpURLConnection.setConnectTimeout(5000);
                    // 设置读取超时
                    httpURLConnection.setReadTimeout(8000);
                    // 响应码为200表示成功，否则失败。
                    if ( httpURLConnection.getResponseCode() == 200 ) {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        //最好在将字节流转换为字符流的时候 进行转码
                        StringBuffer buffer = new StringBuffer();
                        String line = "";
                        while ( (line = bf.readLine()) != null ) {
                            buffer.append(line);
                        }
                        bf.close();
                        is.close();
                        new ResponseCall(context, listener).doSuccess(buffer.toString());
                    } else {
                        new ResponseCall(context, listener).doFail(
                                new NetworkErrorException("response err code:" +
                                        httpURLConnection.getResponseCode()));
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 释放资源
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }

上面讲了doGet方法的实现，其实doPost方法的实现除了需要带上参数列表之外其他都是是一样的。对于参数的处理，在我的开发经历中，参数都是放在Map容器中传递的，所以在这里也就使用的这种方式，对于传进来的参数，我们需要进行处理下，其实也就是字符串的拼接，拼接成HttpURLConnection能够识别的形式。下面的代码进行了参数的组织：

final StringBuffer out = new StringBuffer();
        // 组织请求参数
        for (String key : params.keySet()) {
            if(out.length()!=0){
                out.append("&");
            }
            out.append(key).append("=").append(params.get(key));
        }

拼接好参数列表之后，我们通过httpURLConnection.getOutputStream()获取到PrintWriter，然后写入我们的参数信息即可。其他的操作跟get请求是一样的。

PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
printWriter.write(out.toString());
// flush输出流的缓冲
printWriter.flush();
printWriter.close();

doPost方法

/**
     * POST方法 返回数据会解析成字符串 String
     * @param context 上下文
     * @param urlString 请求的路径
     * @param listener  回调监听
     * @param params 参数列表
     */
    public static void doPost(final Context context,
                              final String urlString, final HttpCallbackStringListener listener,
                              final Map params) {
        final StringBuffer out = new StringBuffer();
        // 组织请求参数
        for (String key : params.keySet()) {
            if(out.length()!=0){
                out.append("&");
            }
            out.append(key).append("=").append(params.get(key));
        }
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url;
                HttpURLConnection httpURLConnection = null;
                try {
                    url = new URL(urlString);
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();
                    httpURLConnection.setRequestProperty("accept", "*/*");
                    httpURLConnection.setRequestProperty("connection", "Keep-Alive");
                    httpURLConnection.setRequestProperty("Content-Length", String
                            .valueOf(out.length()));
                    httpURLConnection.setRequestMethod("POST");

                    httpURLConnection.setConnectTimeout(5000);
                    httpURLConnection.setReadTimeout(8000);

                    // 设置运行输入
                    httpURLConnection.setDoInput(true);
                    // 设置运行输出
                    httpURLConnection.setDoOutput(true);

                    PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
                    // 发送请求参数
                    printWriter.write(out.toString());
                    // flush输出流的缓冲
                    printWriter.flush();
                    printWriter.close();

                    if ( httpURLConnection.getResponseCode() == 200 ) {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        //最好在将字节流转换为字符流的时候 进行转码
                        StringBuffer buffer = new StringBuffer();
                        String line = "";
                        while ( (line = bf.readLine()) != null ) {
                            buffer.append(line);
                        }
                        bf.close();
                        is.close();
                        new ResponseCall(context, listener).doSuccess(buffer.toString());
                    } else {
                        new ResponseCall(context, listener).doFail(
                                new NetworkErrorException("response err code:" +
                                        httpURLConnection.getResponseCode()));
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 最后记得关闭连接
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }

在上面的代码中，在请求的最后，我们会看到一个 new ResponseCall(context, listener).doSuccess(buffer.toString());这个是用来干嘛的呢？其实这个是用来进行子线程和主线程的数据交换的，定义一个Handler，不过Handler是通过looper来创建的，looper是通过传进来的上下文Context来获取主线程的looper，然后次Handler就是位于主线程的。当请求结束后，如果请求成功，则调用doSuccess(T response)方法，给Handler发送消息，消息的what值为0，消息的内容是请求的结果；请求失败或错误的时候，调用doFail(Exception e)方法，给Handler发送消息，消息的what值为1，消息的内容是请求失败的异常信息。当Handler收到消息之后，直接调用listener的回调方法，就可以一方面把数据回调回去，另一方面，回调也是处于主线程也就是UI线程了，这样调用者就可以直接在回调方法中更新UI了。

ResponseCall.java

/**
 * Created by cretin on 2017/3/20.
 */

public class ResponseCall {
    //用于在子线程和主线程的数据交换
    Handler mHandler;

    public ResponseCall(Context context, final HttpCallbackModelListener listener) {
        Looper looper = context.getMainLooper();
        mHandler = new Handler(looper) {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                if ( msg.what == 0 ) {
                    //成功
                    listener.onFinish(msg.obj);
                } else if ( msg.what == 1 ) {
                    //失败
                    listener.onError(( Exception ) msg.obj);
                }
            }
        };
    }

    public ResponseCall(Context context, final HttpCallbackBytesListener listener) {
        Looper looper = context.getMainLooper();
        mHandler = new Handler(looper) {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                if ( msg.what == 0 ) {
                    //成功
                    listener.onFinish(( byte[] ) msg.obj);
                } else if ( msg.what == 1 ) {
                    //失败
                    listener.onError(( Exception ) msg.obj);
                }
            }
        };
    }

    public ResponseCall(Context context, final HttpCallbackStringListener listener) {
        Looper looper = context.getMainLooper();
        mHandler = new Handler(looper) {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                if ( msg.what == 0 ) {
                    //成功
                    listener.onFinish(msg.obj.toString());
                } else if ( msg.what == 1 ) {
                    //失败
                    listener.onError(( Exception ) msg.obj);
                }
            }
        };
    }

    public void doSuccess(T response) {
        Message message = Message.obtain();
        message.obj = response;
        message.what = 0;
        mHandler.sendMessage(message);
    }

    public void doFail(Exception e) {
        Message message = Message.obtain();
        message.obj = e;
        message.what = 1;
        mHandler.sendMessage(message);
    }
}

下面是实际中的调用实例：

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

import com.cretin.www.httpurlconnectionutil.HttpUtils;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackBytesListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackModelListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackStringListener;
import com.cretin.www.httpurlconnectionutildemo.model.ResponseModel;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final TextView tvContent = ( TextView ) findViewById(R.id.tv_content);

        //测试GET请求

        //返回字符串
        try {
            HttpUtils.doGet(this, "http://caipu.yjghost.com/index.php/query/read?menu=" + URLEncoder.encode("土豆", "UTF-8") + "&rn=15&start=1", new HttpCallbackStringListener() {

                @Override
                public void onFinish(String response) {
                    tvContent.setText(response);
                }

                @Override
                public void onError(Exception e) {
                    tvContent.setText(e.toString());
                }
            });
        } catch ( UnsupportedEncodingException e ) {
            e.printStackTrace();
        }

        //返回byte数组
        try {
            HttpUtils.doGet(this, "http://caipu.yjghost.com/index.php/query/read?menu=" + URLEncoder.encode("土豆", "UTF-8") + "&rn=15&start=1", new HttpCallbackBytesListener() {
                @Override
                public void onFinish(byte[] response) {
                    Log.e("HHHHHHH", "GET 方法：" + new String(response));
                }

                @Override
                public void onError(Exception e) {
                    Log.e("HHHHHHH", "doGet onError：" + e.toString());
                }
            });
        } catch ( UnsupportedEncodingException e ) {
            e.printStackTrace();
        }

        //返回对象
        try {
            HttpUtils.doGet(this, "http://caipu.yjghost.com/index.php/query/read?menu=" +
                            URLEncoder.encode("土豆", "UTF-8") + "&rn=15&start=1",
                    new HttpCallbackModelListener() {
                        @Override
                        public void onFinish(ResponseModel response) {
                            Log.e("HHHHHHH", "GET 方法：" + response.getResult().getTotalNum());
                        }

                        @Override
                        public void onError(Exception e) {
                            Log.e("HHHHHHH", "doGet onError：" + e.toString());
                        }
                    }, ResponseModel.class);
        } catch ( UnsupportedEncodingException e ) {
            e.printStackTrace();
        }

        //测试POST请求

        //参数列表
        Map map = new HashMap<>();
        map.put("productFirstType", "1");
        map.put("loanRange", "1");
        map.put("type", "hot");
        map.put("page", "1");
        map.put("timeRange", "1");

        //返回String
        HttpUtils.doPost(this, "http://101.201.31.212:8016/product/listProduct", new HttpCallbackStringListener() {
            @Override
            public void onFinish(String response) {
                Log.e("HHHHHHH", "POST 方法：" + response);
            }

            @Override
            public void onError(Exception e) {
                Log.e("HHHHHHH", "doPost onError：" + e.toString());
            }
        }, map);
        //返回byte数组
        HttpUtils.doPost(this, "http://101.201.31.212:8016/product/listProduct", new HttpCallbackBytesListener() {
            @Override
            public void onFinish(byte[] response) {
                Log.e("HHHHHHH", "POST 方法：" + new String(response));
            }

            @Override
            public void onError(Exception e) {
                Log.e("HHHHHHH", "doPost onError：" + e.toString());
            }
        }, map);
        //返回对象
        HttpUtils.doPost(this, "http://101.201.31.212:8016/product/listProduct", new HttpCallbackModelListener() {
            @Override
            public void onFinish(ResponseModel response) {
                Log.e("HHHHHHH", "POST 方法：" + response.getResult().getTotalNum());
            }

            @Override
            public void onError(Exception e) {
                Log.e("HHHHHHH", "doPost onError：" + e.toString());
            }
        }, map, ResponseModel.class);
    }
}

下面贴出整个工具类的代码：

import android.accounts.NetworkErrorException;
import android.content.Context;

import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackBytesListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackModelListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackStringListener;
import com.cretin.www.httpurlconnectionutil.response.ResponseCall;
import com.google.gson.Gson;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 *  Created by cretin on 2017/3/22.
 *  HttpURLConnection 网络请求工具类
 *
 *  数据的请求都是基于HttpURLConnection的 请求成功与失败的回调都是在主线程
 *  可以直接更新UI
 */
public class HttpUtils {
    static ExecutorService threadPool = Executors.newCachedThreadPool();
    static Gson gson = new Gson();

    /**
     * GET方法 返回数据会解析成字符串String
     * @param context 上下文
     * @param urlString 请求的url
     * @param listener 回调监听
     */
    public static void doGet(final Context context, final String urlString,
                             final HttpCallbackStringListener listener) {
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url;
                HttpURLConnection httpURLConnection = null;
                try {
                    // 根据URL地址创建URL对象
                    url = new URL(urlString);
                    // 获取HttpURLConnection对象
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();
                    // 设置请求方式，默认为GET
                    httpURLConnection.setRequestMethod("GET");
                    // 设置连接超时
                    httpURLConnection.setConnectTimeout(5000);
                    // 设置读取超时
                    httpURLConnection.setReadTimeout(8000);
                    // 响应码为200表示成功，否则失败。
                    if ( httpURLConnection.getResponseCode() == 200 ) {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        //最好在将字节流转换为字符流的时候 进行转码
                        StringBuffer buffer = new StringBuffer();
                        String line = "";
                        while ( (line = bf.readLine()) != null ) {
                            buffer.append(line);
                        }
                        bf.close();
                        is.close();
                        new ResponseCall(context, listener).doSuccess(buffer.toString());
                    } else {
                        new ResponseCall(context, listener).doFail(
                                new NetworkErrorException("response err code:" +
                                        httpURLConnection.getResponseCode()));
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 释放资源
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }

    /**
     * GET方法 返回数据会解析成byte[]数组
     * @param context 上下文
     * @param urlString 请求的url
     * @param listener 回调监听
     */
    public static void doGet(final Context context, final String urlString,
                             final HttpCallbackBytesListener listener) {
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url = null;
                HttpURLConnection httpURLConnection = null;
                try {
                    // 根据URL地址创建URL对象
                    url = new URL(urlString);
                    // 获取HttpURLConnection对象
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();
                    // 设置请求方式，默认为GET
                    httpURLConnection.setRequestMethod("GET");
                    // 设置连接超时
                    httpURLConnection.setConnectTimeout(5000);
                    // 设置读取超时
                    httpURLConnection.setReadTimeout(8000);
                    // 响应码为200表示成功，否则失败。
                    if ( httpURLConnection.getResponseCode() != 200 ) {
                        new ResponseCall(context, listener).doFail(
                                new NetworkErrorException("response err code:" +
                                        httpURLConnection.getResponseCode()));
                    } else {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        // 读取输入流中的数据
                        BufferedInputStream bis = new BufferedInputStream(is);
                        ByteArrayOutputStream baos = new ByteArrayOutputStream();
                        byte[] bytes = new byte[1024];
                        int len = -1;
                        while ( (len = bis.read(bytes)) != -1 ) {
                            baos.write(bytes, 0, len);
                        }
                        bis.close();
                        is.close();
                        // 响应的数据
                        new ResponseCall(context, listener).doSuccess(baos.toByteArray());
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 释放资源
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }

    /**
     * GET方法 返回数据会解析成cls对象
     * @param context 上下文
     * @param urlString 请求路径
     * @param listener 回调监听
     * @param cls 返回的对象
     * @param  监听的泛型
     */
    public static  void doGet(final Context context,
                                 final String urlString,
                                 final HttpCallbackModelListener listener, final Class cls) {
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url;
                HttpURLConnection httpURLConnection = null;
                try {
                    // 根据URL地址创建URL对象
                    url = new URL(urlString);
                    // 获取HttpURLConnection对象
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();
                    // 设置请求方式，默认为GET
                    httpURLConnection.setRequestMethod("GET");
                    // 设置连接超时
                    httpURLConnection.setConnectTimeout(5000);
                    // 设置读取超时
                    httpURLConnection.setReadTimeout(8000);
                    // 响应码为200表示成功，否则失败。
                    if ( httpURLConnection.getResponseCode() == 200 ) {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        //最好在将字节流转换为字符流的时候 进行转码
                        StringBuffer buffer = new StringBuffer();
                        String line = "";
                        while ( (line = bf.readLine()) != null ) {
                            buffer.append(line);
                        }
                        bf.close();
                        is.close();
                        new ResponseCall(context, listener).doSuccess(gson.fromJson(buffer.toString(), cls));
                    } else {
                        if ( listener != null ) {
                            // 回调onError()方法
                            new ResponseCall(context, listener).doFail(
                                    new NetworkErrorException("response err code:" +
                                            httpURLConnection.getResponseCode()));
                        }
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 释放资源
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }


    /**
     * POST方法 返回数据会解析成字符串 String
     * @param context 上下文
     * @param urlString 请求的路径
     * @param listener  回调监听
     * @param params 参数列表
     */
    public static void doPost(final Context context,
                              final String urlString, final HttpCallbackStringListener listener,
                              final Map params) {
        final StringBuffer out = new StringBuffer();
        // 组织请求参数
        for (String key : params.keySet()) {
            if(out.length()!=0){
                out.append("&");
            }
            out.append(key).append("=").append(params.get(key));
        }
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url;
                HttpURLConnection httpURLConnection = null;
                try {
                    url = new URL(urlString);
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();
                    httpURLConnection.setRequestProperty("accept", "*/*");
                    httpURLConnection.setRequestProperty("connection", "Keep-Alive");
                    httpURLConnection.setRequestProperty("Content-Length", String
                            .valueOf(out.length()));
                    httpURLConnection.setRequestMethod("POST");

                    httpURLConnection.setConnectTimeout(5000);
                    httpURLConnection.setReadTimeout(8000);

                    // 设置运行输入
                    httpURLConnection.setDoInput(true);
                    // 设置运行输出
                    httpURLConnection.setDoOutput(true);

                    PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
                    // 发送请求参数
                    printWriter.write(out.toString());
                    // flush输出流的缓冲
                    printWriter.flush();
                    printWriter.close();

                    if ( httpURLConnection.getResponseCode() == 200 ) {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        //最好在将字节流转换为字符流的时候 进行转码
                        StringBuffer buffer = new StringBuffer();
                        String line = "";
                        while ( (line = bf.readLine()) != null ) {
                            buffer.append(line);
                        }
                        bf.close();
                        is.close();
                        new ResponseCall(context, listener).doSuccess(buffer.toString());
                    } else {
                        new ResponseCall(context, listener).doFail(
                                new NetworkErrorException("response err code:" +
                                        httpURLConnection.getResponseCode()));
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 最后记得关闭连接
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }


    /**
     * POST方法 返回数据会解析成Byte[]数组
     * @param context 上下文
     * @param urlString 请求的路径
     * @param listener  回调监听
     * @param params 参数列表
     */
    public static void doPost(final Context context,
                              final String urlString, final HttpCallbackBytesListener listener,
                              final Map params) {
        final StringBuffer out = new StringBuffer();
        // 组织请求参数
        for (String key : params.keySet()) {
            if(out.length()!=0){
                out.append("&");
            }
            out.append(key).append("=").append(params.get(key));
        }
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url;
                HttpURLConnection httpURLConnection = null;
                try {
                    url = new URL(urlString);
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();
                    httpURLConnection.setRequestProperty("accept", "*/*");
                    httpURLConnection.setRequestProperty("connection", "Keep-Alive");
                    httpURLConnection.setRequestProperty("Content-Length", String
                            .valueOf(out.length()));
                    httpURLConnection.setRequestMethod("POST");

                    httpURLConnection.setConnectTimeout(5000);
                    httpURLConnection.setReadTimeout(8000);

                    // 设置运行输入
                    httpURLConnection.setDoInput(true);
                    // 设置运行输出
                    httpURLConnection.setDoOutput(true);

                    PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
                    // 发送请求参数
                    printWriter.write(out.toString());
                    // flush输出流的缓冲
                    printWriter.flush();
                    printWriter.close();

                    if ( httpURLConnection.getResponseCode() == 200 ) {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        // 读取输入流中的数据
                        BufferedInputStream bis = new BufferedInputStream(is);
                        ByteArrayOutputStream baos = new ByteArrayOutputStream();
                        byte[] bytes = new byte[1024];
                        int len = -1;
                        while ( (len = bis.read(bytes)) != -1 ) {
                            baos.write(bytes, 0, len);
                        }
                        bis.close();
                        is.close();
                        // 响应的数据
                        new ResponseCall(context, listener).doSuccess(baos.toByteArray());
                    } else {
                        new ResponseCall(context, listener).doFail(
                                new NetworkErrorException("response err code:" +
                                        httpURLConnection.getResponseCode()));
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 最后记得关闭连接
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }


    /**
     * /**
     * POST方法 返回数据会解析成cls对象
     * @param context 上下文
     * @param urlString 请求的路径
     * @param listener  回调监听
     * @param params 参数列表
     * @param cls 对象
     * @param  监听泛型
     */
    public static  void doPost(final Context context,
                                  final String urlString, final HttpCallbackModelListener listener,
                                  final Map params, final Class cls) {
        final StringBuffer paramsStr = new StringBuffer();
        // 组织请求参数
        Iterator it = params.entrySet().iterator();
        while ( it.hasNext() ) {
            Map.Entry element = ( Map.Entry ) it.next();
            paramsStr.append(element.getKey());
            paramsStr.append("=");
            paramsStr.append(element.getValue());
            paramsStr.append("&");
        }
        if ( paramsStr.length() > 0 ) {
            paramsStr.deleteCharAt(paramsStr.length() - 1);
        }
        // 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
        threadPool.execute(new Runnable() {
            @Override
            public void run() {
                URL url;
                HttpURLConnection httpURLConnection = null;
                try {
                    url = new URL(urlString);
                    httpURLConnection = ( HttpURLConnection ) url.openConnection();

                    httpURLConnection.setRequestMethod("POST");

                    httpURLConnection.setConnectTimeout(5000);
                    httpURLConnection.setReadTimeout(8000);

                    // 设置运行输入
                    httpURLConnection.setDoInput(true);
                    // 设置运行输出
                    httpURLConnection.setDoOutput(true);

                    PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
                    // 发送请求参数
                    printWriter.write(paramsStr.toString());
                    // flush输出流的缓冲
                    printWriter.flush();
                    printWriter.close();

                    if ( httpURLConnection.getResponseCode() == 200 ) {
                        // 获取网络的输入流
                        InputStream is = httpURLConnection.getInputStream();
                        BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        //最好在将字节流转换为字符流的时候 进行转码
                        StringBuffer buffer = new StringBuffer();
                        String line = "";
                        while ( (line = bf.readLine()) != null ) {
                            buffer.append(line);
                        }
                        bf.close();
                        is.close();
                        new ResponseCall(context, listener).doSuccess(gson.fromJson(buffer.toString(), cls));
                    } else {
                        new ResponseCall(context, listener).doFail(
                                new NetworkErrorException("response err code:" +
                                        httpURLConnection.getResponseCode()));
                    }
                } catch ( MalformedURLException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } catch ( IOException e ) {
                    if ( listener != null ) {
                        // 回调onError()方法
                        new ResponseCall(context, listener).doFail(e);
                    }
                } finally {
                    if ( httpURLConnection != null ) {
                        // 最后记得关闭连接
                        httpURLConnection.disconnect();
                    }
                }
            }
        });
    }
}

HttpCallbackBytesListener.java

/**
 * HttpURLConnection网络请求返回监听器
 */
public interface HttpCallbackBytesListener {
    // 网络请求成功
    void onFinish(byte[] response);

    // 网络请求失败
    void onError(Exception e);
}

HttpCallbackModelListener.java

/**
 * HttpURLConnection网络请求返回监听器
 */
public interface  HttpCallbackModelListener {
    // 网络请求成功
    void onFinish(T response);

    // 网络请求失败
    void onError(Exception e);
}

HttpCallbackStringListener.java

/**
 * HttpURLConnection网络请求返回监听器
 */
public interface HttpCallbackStringListener {
    // 网络请求成功
    void onFinish(String response);

    // 网络请求失败
    void onError(Exception e);
}

代码已经上传到github，欢迎Star。

我叫Cretin，一个可爱的小男孩。

https://github.com/MZCretin/HttpUrlConnectionUtilDemo

Android 自定义网络加载工具类 HttpURLConnectionUtils

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