java程序模拟登陆人人网

package cn.com.talkweb.http.client;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class Login_renren
{
 public static void main(String[] args) throws ClientProtocolException,

IOException
 {
  // TODO Auto-generated method stub
  String loginurl="http://www.renren.com/PLogin.do";
  String username="[email protected]";
  String password="123";
  System.out.println(Login_renren.posturl

(loginurl,username,password));
 }

 
 public static String posturl(String loginurl,String username,String

password) throws ClientProtocolException, IOException
 {
  HttpClient httpclient1 = new DefaultHttpClient();
  HttpPost httppost = new HttpPost(loginurl);
  List<NameValuePair> formparams = new ArrayList<NameValuePair>();
  formparams.add(new BasicNameValuePair("email",username));
  formparams.add(new BasicNameValuePair("password",password));
  UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams,

"utf-8");
  httppost.setEntity(entity);
  String str="";
  HttpClient httpclient2=null;
  try {
   HttpResponse response1 = httpclient1.execute(httppost);
   
   String login_success=response1.getFirstHeader

("Location").getValue();//获取登陆成功之后跳转链接
   HttpGet httpget = new HttpGet(login_success);
   httpclient2 = new DefaultHttpClient();
   HttpResponse response2=httpclient2.execute(httpget);
   str=EntityUtils.toString(response2.getEntity());
      httppost.abort();
      httpget.abort();
  } finally
  {
   httpclient1.getConnectionManager().shutdown();
   httpclient2.getConnectionManager().shutdown();
  }
  
  return str;
 }
}