代码如何实现登陆

使用爬虫拿取开心网（www.kaixin001.com）中好友的ID、名字时需要经过登陆页面
下面是用代码来实现登陆并拿取数据：

package com.kaixin001;

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.GetMethod;
import org.htmlparser.Node;
import org.htmlparser.NodeFilter;
import org.htmlparser.Parser;
import org.htmlparser.filters.AndFilter;
import org.htmlparser.filters.HasAttributeFilter;
import org.htmlparser.filters.TagNameFilter;
import org.htmlparser.util.NodeList;
import com.kaixin.commons.Globals;
import com.kaixin.utils.commonshc.UTF8PostMethod;

/**
* 开心网登录
* @author fuyun
*  2009-9-12
*/
public class Kaixin {

// <div class="srr">
// <div class="vafname">
// <div class="r w100 tar">
private static final NodeFilter SRR_DIV_CLASS = new AndFilter(
new TagNameFilter("div"), new HasAttributeFilter("class","srr"));
private static final NodeFilter VAFNAME_DIV_CLASS = new AndFilter(
new TagNameFilter("div"), new HasAttributeFilter("class","vafname"));
private static final NodeFilter TAR_DIV_CLASS = new AndFilter(
new TagNameFilter("div"), new HasAttributeFilter("class","r w100 tar"));
private static final NodeFilter FILTER_A = new TagNameFilter("a");

   static final String LOGON_SITE = " www.kaixin001.com" ;
   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);
     
        NameValuePair[] parr = new NameValuePair[10];
  parr[0] = new NameValuePair("rcode", "");
  parr[1] = new NameValuePair("url", "/home/");
  parr[2] = new NameValuePair("rpkey", "");
  parr[3] = new NameValuePair("diarykey", "");
  parr[4] = new NameValuePair("invisible_mode", "0");
  parr[5] = new NameValuePair("email", "[e-mail]");
  parr[6] = new NameValuePair("password", "5201314");
  parr[7] = new NameValuePair("code", "");
  parr[8] = new NameValuePair("btn_dl","%B5%C7%C2%BC");
  parr[9] = new NameValuePair("User-Agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)"); 
  UTF8PostMethod postMethod = new UTF8PostMethod(" http://www.kaixin001.com/login/login.php");
        postMethod.setRequestHeader("Referer", " http://www.kaixin001.com/login/login.php");
  postMethod.setRequestBody(parr);

  int statusCode = client.executeMethod(postMethod);
  //==========================================================
  System.out.println(statusCode);
  if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
    || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
   // 从头中取出转向的地址
   Header locationHeader = postMethod.getResponseHeader("location");
   String location = null;
   if (locationHeader != null) {
    location = locationHeader.getValue();
    //System.out.println("The page was redirected to:" + location);
   } else {
    System.err.println("Location field value is null.");
   }
         GetMethod get = new GetMethod(" http://www.kaixin001.com/" + location);    
         System.err.println(get);
         client.executeMethod(get);  
         String html = get.getResponseBodyAsString();
         //System.out.println(html);
       
         Parser nodeParser1 = Parser.createParser(html, Globals.CHARSET_UTF8);
         NodeList nodeList1 = nodeParser1.parse(TAR_DIV_CLASS);
         Parser nodeParser2 = Parser.createParser(nodeList1.toHtml(), Globals.CHARSET_UTF8);
         NodeList nodeList2 = nodeParser2.parse(FILTER_A);
         Node aNode3 = nodeList2.elementAt(0);
         String msgUrl = "http://www.kaixin001.com"+aNode3.getText().split("href=")[1].substring(1, 15);
         System.out.println(msgUrl);
        
         GetMethod get1 = new GetMethod(msgUrl);    
         System.err.println(get1);
         client.executeMethod(get1);  
         //String html1 = get1.getResponseBodyAsString();
        // System.out.println("***"+html1);
        
         Parser nodeParser11 = Parser.createParser(html, Globals.CHARSET_UTF8);
         NodeList nodeList11 = nodeParser11.parse(SRR_DIV_CLASS);
         Parser nodeParser22 = Parser.createParser(nodeList11.toHtml(), Globals.CHARSET_UTF8);
         NodeList nodeList22 = nodeParser22.parse(VAFNAME_DIV_CLASS);
         Parser nodeParser33 = Parser.createParser(nodeList22.toHtml(), Globals.CHARSET_UTF8);
         NodeList nodeList33 = nodeParser33.parse(FILTER_A);
         System.out.println(nodeList33.toHtml());
         if(nodeList33 != null && nodeList33.size()>0){
        for(int a=0;a<(nodeList33.size());a++){
Node aNode33 = nodeList33.elementAt(a);
System.out.println("好友名："+aNode33.toPlainTextString());
String friendId = aNode33.getText().split("uid=")[1].substring(0,;
String friendUrl = "http://www.kaixin001.com/home/"+aNode33.getText().split("uid=")[1].substring(0,;
System.out.println(friendId);
System.out.println(friendUrl);
}
         }  
  }
}  
}