import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;import org.apache.commons.httpclient.params.HttpClientParams;import org.apache.commons.httpclient.params.HttpConnectionManagerParams;public class HttpClientUtil { ???private HttpClientUtil() { ???} ???private static HttpClient httpClient = null; ???//静态工厂方法 ??????public static HttpClient getInstanceHttpClient() { ???????if (httpClient == null) { ???????????MultiThreadedHttpConnectionManager connectionManager = new MultiThreadedHttpConnectionManager(); ???????????// 创建 HttpClient 的多线程实例 ?????????????//在创建httpclient对象的时候，默认使用simpleHttpConnectionManager作为连接管理，而它不适合多线程环境。故修正方法是：自己创建httpclient对象，并指定适合多线程环境的连接管理器。// ???????????httpClient = new HttpClient(connectionManager);// ???????????/* ???????????HttpConnectionManagerParams params = new HttpConnectionManagerParams(); ???????????params.setConnectionTimeout(1000);// ???????????params.setSoTimeout(2000); ???????????// 最大连接数 ???????????params.setMaxTotalConnections(1); ???????????params.setDefaultMaxConnectionsPerHost(1); ???????????params.setStaleCheckingEnabled(true); ???????????connectionManager.setParams(params); ???????????HttpClientParams httpClientParams = new HttpClientParams(); ???????????// 设置httpClient的连接超时，对连接管理器设置的连接超时是无用的 ???????????httpClientParams.setConnectionManagerTimeout(1000); //等价于4.2.3中的CONN_MANAGER_TIMEOUT ???????????httpClient = new HttpClient(connectionManager); ???????????httpClient.setParams(httpClientParams); ???????????//另外设置http client的重试次数，默认是3次；当前是禁用掉（如果项目量不到，这个默认即可）// ???????????httpClientParams.setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(0, false));// ???????????*/ ???????} ???????return httpClient; ???}}HttpClientUtil
原文地址：http://blog.51cto.com/chend/2090651