package com.demo.util; import java.io.IOException; import java.util.Map; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.SimpleHttpConnectionManager; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.methods.PostMethod; public class HttpRequestUtil { /** * HttpClient 模拟POST请求 * @param url * @param params * @return */ public static String postRequest(String url, Map<String, String> params) { //构造HttpClient的实例 HttpClient httpClient = new HttpClient(); //创建POST方法的实例 PostMethod postMethod = new PostMethod(url); //设置请求头信息 postMethod.setRequestHeader( "Connection" , "close" ); //添加参数 for (Map.Entry<String, String> entry : params.entrySet()) { postMethod.addParameter(entry.getKey(), entry.getValue()); } //使用系统提供的默认的恢复策略,设置请求重试处理,用的是默认的重试处理:请求三次 httpClient.getParams().setBooleanParameter( "http.protocol.expect-continue" , false ); //接收处理结果 String result = null ; try { //执行Http Post请求 httpClient.executeMethod(postMethod); //返回处理结果 result = postMethod.getResponseBodyAsString(); } catch (HttpException e) { // 发生致命的异常,可能是协议不对或者返回的内容有问题 System.out.println( "请检查输入的URL!" ); e.printStackTrace(); } catch (IOException e) { // 发生网络异常 System.out.println( "发生网络异常!" ); e.printStackTrace(); } finally { //释放链接 postMethod.releaseConnection(); //关闭HttpClient实例 if (httpClient != null ) { ((SimpleHttpConnectionManager) httpClient.getHttpConnectionManager()).shutdown(); httpClient = null ; } } return result; } /** * HttpClient 模拟GET请求 * 方法说明 * @Discription:扩展说明 * @param url * @param params * @return String */ public static String getRequest(String url, Map<String, String> params) { //构造HttpClient实例 HttpClient client = new HttpClient(); //拼接参数 String paramStr = "" ; for (String key : params.keySet()) { paramStr = paramStr + "&" + key + "=" + params.get(key); } paramStr = paramStr.substring( 1 ); //创建GET方法的实例 GetMethod method = new GetMethod(url + "?" + paramStr); //接收返回结果 String result = null ; try { //执行HTTP GET方法请求 client.executeMethod(method); //返回处理结果 result = method.getResponseBodyAsString(); } catch (HttpException e) { // 发生致命的异常,可能是协议不对或者返回的内容有问题 System.out.println( "请检查输入的URL!" ); e.printStackTrace(); } catch (IOException e) { // 发生网络异常 System.out.println( "发生网络异常!" ); e.printStackTrace(); } finally { //释放链接 method.releaseConnection(); //关闭HttpClient实例 if (client != null ) { ((SimpleHttpConnectionManager) client.getHttpConnectionManager()).shutdown(); client = null ; } } return result; } } |