http请求与响应工具类
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?对于http的请求与响应，可以使用commons-httpclient.jar来实现数据的接收与发送，代码如下：
package com.project.util;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;import org.apache.commons.httpclient.NameValuePair;import org.apache.commons.httpclient.methods.PostMethod;/** * Http请求公共类 * @author Administrator * */public class HttpPost {private static HttpClient httpclient = null;private static int iTimeOut = 5000;@SuppressWarnings("rawtypes")private static Map map = new HashMap();private static final Object object = new Object();private String postUrl = null;private HttpPost() {}public static HttpPost getInstance(String sUrl) {HttpPost instance = null;if((instance = (HttpPost) map.get(sUrl)) == null) {synchronized (object) {if((instance = (HttpPost)map.get(sUrl)) == null) {if(httpclient == null) {MultiThreadedHttpConnectionManager manager = new MultiThreadedHttpConnectionManager();httpclient = new HttpClient(manager);}instance = new HttpPost();instance.postUrl = sUrl;}}}return instance;}public String post(Map map) {return post(map, "application/x-www-form-urlencoded", "Mozilla/4.0");}public String post(Map map, String contentType, String userAgent) {if(iTimeOut >= 0) {httpclient.getHttpConnectionManager().getParams().setConnectionTimeout(iTimeOut);} else {httpclient.getHttpConnectionManager().getParams().setConnectionTimeout(0);}PostMethod method = new PostMethod(postUrl);method.addRequestHeader("Content-Type", contentType);method.addRequestHeader("User-Agent", userAgent);// 处理需要发送的字符串NameValuePair[] valuePairs = new NameValuePair[map.size()];Collection collection = map.entrySet();Iterator iterator = collection.iterator();int i = 0;while(iterator.hasNext()) {String strKey = ((Map.Entry)iterator.next()).getKey().toString();valuePairs[(i++)] = new NameValuePair(strKey, (String)map.get(strKey));}method.setRequestBody(valuePairs);String responseStr = "";try {httpclient.executeMethod(method);String charSet = method.getResponseCharSet();responseStr = new String(method.getResponseBodyAsString().getBytes(charSet), "ISO8859-1");} catch(Exception e) {e.printStackTrace();}return responseStr;}}?