import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.ResponseHandler; 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.impl.client.BasicResponseHandler; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager; import java.io.IOException; import java.text.MessageFormat; import java.util.List; import java.util.concurrent.TimeUnit; /**  * 分装一个http请求的工具类  *  * @author 顾炜【guwei】 on 14-4-22.下午3:17  */ public class HttpClientUtils {     private static final Log log = LogFactory.getLog(HttpClientUtils.class);     /**      * 初始化HttpClient      */     private static HttpClient httpClient = null;     /**      * 生产HttpClient实例      * 公开，静态的工厂方法，需要使用时才去创建该单体      *      * @return      */     public static HttpClient getHttpClient() {         if (httpClient == null) {             httpClient = new DefaultHttpClient(new ThreadSafeClientConnManager());         }         return httpClient;     }     /**      * POST方式调用      *      * @param url      * @param params 参数为NameValuePair键值对对象      * @return 响应字符串      * @throws java.io.UnsupportedEncodingException      */     public static String executeByPOST(String url, List<NameValuePair> params) {         HttpClient httpclient = getHttpClient();         HttpPost post = new HttpPost(url);         ResponseHandler<String> responseHandler = new BasicResponseHandler();         String responseJson = null;         try {             if (params != null) {                 post.setEntity(new UrlEncodedFormEntity(params));             }             responseJson = httpclient.execute(post, responseHandler);             log.info("HttpClient POST请求结果：" + responseJson);         } catch (ClientProtocolException e) {             e.printStackTrace();             log.info("HttpClient POST请求异常：" + e.getMessage());         } catch (IOException e) {             e.printStackTrace();         } finally {             httpclient.getConnectionManager().closeExpiredConnections();             httpclient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);         }         return responseJson;     }     /**      * Get方式请求      *      * @param url    带参数占位符的URL，例：http://****/User/user/center.aspx?_action=GetSimpleUserInfo&codes={0}&email={1}      * @param params 参数值数组，需要与url中占位符顺序对应      * @return 响应字符串      * @throws java.io.UnsupportedEncodingException      */     public static String executeByGET(String url, Object[] params) {         HttpClient httpclient = getHttpClient();         String messages = MessageFormat.format(url, params);         HttpGet get = new HttpGet(messages);         ResponseHandler<String> responseHandler = new BasicResponseHandler();         String responseJson = null;         try {             responseJson = httpclient.execute(get, responseHandler);             log.info("HttpClient GET请求结果：" + responseJson);         } catch (ClientProtocolException e) {             e.printStackTrace();             log.info("HttpClient GET请求异常：" + e.getMessage());         } catch (IOException e) {             e.printStackTrace();             log.info("HttpClient GET请求异常：" + e.getMessage());         } finally {             httpclient.getConnectionManager().closeExpiredConnections();             httpclient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);         }         return responseJson;     }     /**      * @param url      * @return      */     public static String executeByGET(String url) {         HttpClient httpclient = getHttpClient();         HttpGet get = new HttpGet(url);         ResponseHandler<String> responseHandler = new BasicResponseHandler();         String responseJson = null;         try {             responseJson = httpclient.execute(get, responseHandler);             log.info("HttpClient GET请求结果：" + responseJson);         } catch (ClientProtocolException e) {             e.printStackTrace();             log.info("HttpClient GET请求异常：" + e.getMessage());         } catch (IOException e) {             e.printStackTrace();             log.info("HttpClient GET请求异常：" + e.getMessage());         } finally {             httpclient.getConnectionManager().closeExpiredConnections();             httpclient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);         }         return responseJson;     } }