Android

//使用HttpURLConnection get 实现网络数据请求 

public class HttpUtils {     private static final String TAG = "HttpUtils----";     //单利模式     private static HttpUtils httpUtils = new HttpUtils();     private final static int SUCCESS = 0;     private final static int ERROR = 1;     private MyHandler myHandler = new MyHandler();     private HttpUtilsListener httpUtilsListener;

    public static HttpUtils getInstance() {         if (httpUtils == null) {             httpUtils = new HttpUtils();         }         return httpUtils;     }

    //封装get     public void get(final String url) {         new Thread() {             @Override             public void run() {                 //进行网络请求                 try {                     URL url1 = new URL(url);                     HttpURLConnection connection = (HttpURLConnection) url1.openConnection();                     connection.setConnectTimeout(3000);                     if (connection.getResponseCode() == 200) {                         InputStream inputStream = connection.getInputStream();                         //inputstream--string                         String json = inputStreamToString(inputStream);                         //发送                         Message message = myHandler.obtainMessage();                         message.what = SUCCESS;                         message.obj = json;                         myHandler.sendMessage(message);

                    } else {                         Message message = myHandler.obtainMessage();                         message.what = ERROR;                         message.obj = "失败";                         myHandler.sendMessage(message);                     }                 } catch (Exception e) {                     e.printStackTrace();                     Message message = myHandler.obtainMessage();                     message.what = ERROR;                     message.obj = e.getMessage();                     myHandler.sendMessage(message);                 }             }         }.start();     }

    //使用Handler 处理线程问题     class MyHandler extends Handler {         @Override         public void handleMessage(Message msg) {             switch (msg.what) {                 case SUCCESS:                     //成功                     String json = (String) msg.obj;                     Log.d(TAG, "handleMessage: " + json);                     //使用回调                     httpUtilsListener.getDataSuccess(json);                     break;                 case ERROR:                     //成功                     String error = (String) msg.obj;                     Log.d(TAG, "handleMessage: " + error);                     //使用回调                     httpUtilsListener.getDataError(error);                     break;             }         }     }

    public String inputStreamToString(InputStream inputStream) throws IOException {         int len = 0;         byte[] butter = new byte[1024];         StringBuffer stringBuffer = new StringBuffer();         while ((len = inputStream.read(butter)) != -1) {             String s = new String(butter, 0, len);             stringBuffer.append(s);

        }         return stringBuffer.toString();     }

    //接口回调     public interface HttpUtilsListener {         void getDataSuccess(String json);

        void getDataError(String error);     }

    //外部访问的方法     public void setHttpUtilsListener(HttpUtilsListener httpUtilsListener) {         this.httpUtilsListener = httpUtilsListener;     } }