Sample---simulate the http request
package com.wlq;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class RDRHttpCallSample {private static final int TIMEOUT = 50000; public final static String BAIDU_URL = "http://www.baidu.com" ; public final static String MSG_NULL = "content is null";public static boolean validate(String source) {boolean rs = true;if (source.equals(MSG_NULL))rs = false;if (source.indexOf("ERROR#") != -1 || source.indexOf("ErrorMsg") != -1 || source.indexOf("ERROR_TYPE") != -1)rs = false;return rs;}public static String getHttpUsefulInfo(StringBuffer buffer) {String rs = "";if (buffer.indexOf("<body>") != -1) {int index = buffer.indexOf("<body>");buffer.replace(0, index + 6, "");index = buffer.indexOf("</body>");buffer.replace(index, buffer.length(), "");}rs = buffer.toString();return rs.equals("") ? rs = MSG_NULL : rs;}public static StringBuffer doCall(String url, String queryStr){StringBuffer rs = new StringBuffer();HttpURLConnection conn = null;String sTotalString = "";int respCode = 0;try{URL console = new URL(url);conn = (HttpURLConnection) console.openConnection();conn.setConnectTimeout(TIMEOUT);conn.setDoOutput(true);conn.setRequestMethod("POST");conn.getOutputStream().write(queryStr.getBytes());conn.getOutputStream().flush();conn.getOutputStream().close();conn.connect();respCode = conn.getResponseCode();if(respCode == 200){String sCurrentLine = "";InputStream is = conn.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(is));while ((sCurrentLine = reader.readLine()) != null)if (sCurrentLine.length() > 0)sTotalString = sTotalString + sCurrentLine.trim();}else{sTotalString = "Call the rdr server error, error code is " + respCode;}}catch (Exception e) {e.printStackTrace();}finally{if(conn !=null)conn.disconnect();if(validate(sTotalString))rs.append(getHttpUsefulInfo(new StringBuffer(sTotalString)));}return rs;}public enum QueryStrGenerator{BAIDU_CASE{@Overridepublic String getQueryStr(){String str ="s?wd=what+if+you+go&rsv_spt=1&issp=1&rsv_bp=0&ie=utf-8&tn=baiduhome_pg&inputT=2094";return str;}};abstract public String getQueryStr();}public static void main(String...args){String url = BAIDU_URL, queryStr = QueryStrGenerator.BAIDU_CASE.getQueryStr();StringBuffer rs = doCall(url, queryStr);System.out.println(rs.toString());}}