java web中 HttpClient模拟浏览器登录后发起请求

package com.artsoft.demo;import java.io.FileOutputStream;  import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.CookieStore; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.PoolingClientConnectionManager; import org.apache.http.util.EntityUtils;  /**  * TODO(用一句话描述该文件的作用)  *  * @title: HttpClientDemo.java  * @author zhangjinshan-ghq  * @date 2014-6-11 14:59:04  */  public class HttpClientDemo {    /**    * The main method.    *    * @param args the arguments    * @throws Exception the exception    */   public static void main(String[] args) throws Exception   {     getResoucesByLoginCookies();   }    /**    * 根据登录Cookie获取资源    * 一切异常均未处理，需要酌情检查异常    *    * @throws Exception    */   private static void getResoucesByLoginCookies() throws Exception   {     HttpClientDemo demo = new HttpClientDemo();     String username = "......";// 登录用户     String password = "......";// 登录密码      // 需要提交登录的信息     String urlLogin = "http://hx.buscoming.cn/Api/Security/Logon?UserCode=" + username + "&Password=" + password;      // 登录成功后想要访问的页面 可以是下载资源 需要替换成自己的iteye Blog地址     String urlAfter = "http://hx.buscoming.cn/Api/Security/GetLoginAccount";     DefaultHttpClient client = new DefaultHttpClient(new PoolingClientConnectionManager());      /**      * 第一次请求登录页面 获得cookie      * 相当于在登录页面点击登录，此处在URL中 构造参数，      * 如果参数列表相当多的话可以使用HttpClient的方式构造参数      * 此处不赘述      */     HttpPost post = new HttpPost(urlLogin);     HttpResponse response = client.execute(post);     HttpEntity entity = response.getEntity();     CookieStore cookieStore = client.getCookieStore();     client.setCookieStore(cookieStore);      /**      * 带着登录过的cookie请求下一个页面，可以是需要登录才能下载的url      * 此处使用的是iteye的博客首页，如果登录成功，那么首页会显示【欢迎XXXX】      *      */     HttpGet get = new HttpGet(urlAfter);     response = client.execute(get);     entity = response.getEntity();      /**      * 将请求结果放到文件系统中保存为 myindex.html,便于使用浏览器在本地打开 查看结果      */      String pathName = "d://index.html";     writeHTMLtoFile(entity, pathName);   }    /**    * Write htmL to file.    * 将请求结果以二进制形式放到文件系统中保存为.html文件,便于使用浏览器在本地打开 查看结果    *    * @param entity the entity    * @param pathName the path name    * @throws Exception the exception    */   public static void writeHTMLtoFile(HttpEntity entity, String pathName) throws Exception   {      byte[] bytes = new byte[(int) entity.getContentLength()];      FileOutputStream fos = new FileOutputStream(pathName);      bytes = EntityUtils.toByteArray(entity);      fos.write(bytes);      fos.flush();      fos.close();   }  }