HttpClientUtil

Posted 2020-10-28

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; } }