Android 网络请求get/post工具类：NetUtil

package com.net.util;    import java.io.IOException;  import java.io.UnsupportedEncodingException;  import java.util.List;  import org.apache.http.HttpResponse;  import org.apache.http.HttpStatus;  import org.apache.http.NameValuePair;  import org.apache.http.client.ClientProtocolException;  import org.apache.http.client.entity.UrlEncodedFormEntity;  import org.apache.http.client.methods.HttpGet;  import org.apache.http.client.methods.HttpPost;  import org.apache.http.client.methods.HttpUriRequest;  import org.apache.http.impl.client.DefaultHttpClient;  import org.apache.http.util.EntityUtils;  import org.json.JSONException;  import org.json.JSONObject;  import android.content.Context;  import android.net.ConnectivityManager;  import android.net.NetworkInfo;  import android.util.Log;  import android.widget.Toast;    public class NetUtil {   private static final String TAG = "NetUtil";     /**    * 网络连接是否可用    */   public static boolean isConnnected(Context context) {    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);    if (null != connectivityManager) {     NetworkInfo networkInfo[] = connectivityManager.getAllNetworkInfo();       if (null != networkInfo) {      for (NetworkInfo info : networkInfo) {       if (info.getState() == NetworkInfo.State.CONNECTED) {        Log.e(TAG, "the net is ok");        return true;       }      }     }    }    Toast.makeText(context, "网络连接失败", Toast.LENGTH_SHORT).show();    return false;   }     /**    * 网络可用状态下，通过get方式向server端发送请求，并返回响应数据    *     * @param strUrl 请求网址    * @param context 上下文    * @return 响应数据    */   public static JSONObject getResponseForGet(String strUrl, Context context) {    if (isConnnected(context)) {     return getResponseForGet(strUrl);    }    return null;   }     /**    * 通过Get方式处理请求，并返回相应数据    *     * @param strUrl 请求网址    * @return 响应的JSON数据    */   public static JSONObject getResponseForGet(String strUrl) {    HttpGet httpRequest = new HttpGet(strUrl);    return getRespose(httpRequest);   }     /**    * 网络可用状态下，通过post方式向server端发送请求，并返回响应数据    *     * @param market_uri 请求网址    * @param nameValuePairs 参数信息    * @param context 上下文    * @return 响应数据    */   public static JSONObject getResponseForPost(String market_uri, List<NameValuePair> nameValuePairs, Context context) {    if (isConnnected(context)) {     return getResponseForPost(market_uri, nameValuePairs);    }    return null;   }     /**    * 通过post方式向服务器发送请求，并返回响应数据    *     * @param strUrl 请求网址    * @param nameValuePairs 参数信息    * @return 响应数据    */   public static JSONObject getResponseForPost(String market_uri, List<NameValuePair> nameValuePairs) {    if (null == market_uri || "" == market_uri) {     return null;    }    HttpPost request = new HttpPost(market_uri);    try {     request.setEntity(new UrlEncodedFormEntity(nameValuePairs));     return getRespose(request);    } catch (UnsupportedEncodingException e1) {     e1.printStackTrace();    }    return null;   }     /**    * 响应客户端请求    *     * @param request 客户端请求get/post    * @return 响应数据    */   public static JSONObject getRespose(HttpUriRequest request) {    try {     HttpResponse httpResponse = new DefaultHttpClient().execute(request);     int statusCode = httpResponse.getStatusLine().getStatusCode();     if (HttpStatus.SC_OK == statusCode) {      String result = EntityUtils.toString(httpResponse.getEntity());      Log.i(TAG, "results=" + result);      return new JSONObject(result);     }    } catch (ClientProtocolException e) {     e.printStackTrace();    } catch (IOException e) {     e.printStackTrace();    } catch (JSONException e) {     e.printStackTrace();    }    return null;   }  }