关于请教登录校内代码失败的原因

下面这段代码是我该别人的代码用来登录校内，可老是失败，不知道为什么，请高手帮忙看看改改，谢谢记得要用账户和密码，我这里用了*号表示，请用自己的账户
我是新手，没什么分，还请见谅
 import org.apache.commons.httpclient.Cookie;   
import org.apache.commons.httpclient.HttpClient;   
import org.apache.commons.httpclient.NameValuePair;   
import org.apache.commons.httpclient.methods.GetMethod;   
import org.apache.commons.httpclient.methods.PostMethod;   
  
public class LoginKaixin {   
    private static final String LOGON_SITE = "http://www.renren.com/";   
    private static final int LOGON_PORT = 80;   
    public static void main(String[] args)throws Exception {   
        HttpClient client = new HttpClient();   
        client.getHostConfiguration().setHost(LOGON_SITE, LOGON_PORT);   
//           http://home.renren.com/Home.do 
        //登录页面   
        PostMethod post = new PostMethod("http://www.renren.com/PLogin.do");   
        NameValuePair ie = new NameValuePair("User-Agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");      
//        NameValuePair url = new NameValuePair("url", "/home/");   
       
          NameValuePair url = new NameValuePair("url", " http://www.renren.com/PLogin.do");   
        NameValuePair username = new NameValuePair("email","****@sina.com");   
        NameValuePair password = new NameValuePair("password", "****");   
    post.setRequestBody(new NameValuePair[] { ie,url,username, password});   
        client.executeMethod(post);   
        System.out.println("******************************登录******************************");   
        Cookie[] cookies = client.getState().getCookies();   
        client.getState().addCookies(cookies);   
        post.releaseConnection();   
        System.out.println("******************************页面转向******************************");   
        String newUrl="http://photo.renren.com/getalbumprofile.do?owner=239947811";   
        System.out.println("==========Cookies============");   
        int i=0;   
        for(Cookie c:cookies){   
            System.out.println(++i+":   "+c);   
        }   
        client.getState().addCookies(cookies);   
        post.releaseConnection();   
        GetMethod get = new GetMethod(newUrl);   
        get.setRequestHeader("Cookie", cookies.toString());   
        client.executeMethod(get);   
        String responseString = get.getResponseBodyAsString();   
        //登录后首页的内容   
        System.out.println(responseString);   
        get.releaseConnection();   
//        System.out.println("******************************组件功能******************************");   
//        //"http://www.kaixin001.com/!slave/index.php", "朋友买卖"   
//        //"http://www.kaixin001.com/!parking/index.php", "争车位"   
//        //"http://www.kaixin001.com/!house/index.php?_lgmode=pri", "买房子"    
//        //http://www.kaixin001.com/!house/index.php?_lgmode=pri&t=49   
//        //"http://www.kaixin001.com/!house/garden/index.php","花园"   
//        //(1)进入朋友买卖****************   
//        System.out.println("******************************(1)进入朋友买卖******************************");   
//        String slave="http://www.kaixin001.com/!slave/index.php";   
//        get = new GetMethod(slave);   
//        get.setRequestHeader("Cookie", cookies.toString());   
//        client.executeMethod(get);   
//        responseString = get.getResponseBodyAsString();   
//        System.out.println(responseString);   
//        get.releaseConnection();   
//        //(2)进入争车位****************   
//        System.out.println("******************************(2)进入争车位******************************");   
//        String parking="http://www.kaixin001.com/!parking/index.php";   
//        get = new GetMethod(parking);   
//        get.setRequestHeader("Cookie", cookies.toString());   
//        client.executeMethod(get);   
//        responseString = get.getResponseBodyAsString();   
//        System.out.println(responseString);   
//        get.releaseConnection();   
//        //(3)进入买房子****************   
//        System.out.println("******************************(3)进入买房子*******************************");   
//        String house="http://www.kaixin001.com/!house/index.php?_lgmode=pri&t=49";   
//        get = new GetMethod(house);   
//        get.setRequestHeader("Cookie", cookies.toString());   
//        client.executeMethod(get);   
//        responseString = get.getResponseBodyAsString();   
//        System.out.println(responseString);   
//        get.releaseConnection();   
//        //(4)进入花园****************   
//        System.out.println("******************************(4)进入花园*******************************");   
//        String garden="http://www.kaixin001.com/!house/garden/index.php";   
//        get = new GetMethod(garden);   
//        get.setRequestHeader("Cookie", cookies.toString());   
//        client.executeMethod(get);   
//        responseString = get.getResponseBodyAsString();   
//        System.out.println(responseString);   
//        get.releaseConnection();   
           
           
    }   
  
}