JAVA 爬虫问题

package com.lc;import java.net.*;  
import java.io.*;  
import java.util.Locale;  
class Test   
{  
    public static void main(String[] args)   
    {  
        try  
        {  
          
                String urlstr="http://search.anccnet.com/searchResult.aspx?keyword=袜子";  
                URL url=new URL(urlstr);  
               // URLConnection conn=url.openConnection();  
                
                
                
                
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
  
                //这里是关键，表示我们要向链接里输出内容  
                conn.setDoOutput(true);  
  
                //获得连接输出流  
                OutputStreamWriter out=new OutputStreamWriter(conn.getOutputStream());  
  
                //这里是我定义了一组账号信息，字段+数据  
            //    String str=String.format(Locale.CHINA,"login=%s&&passwd=%s&&repasswd=%s&&Prompt=%s&&answer=%s&&email=%s",  
              //      temp+i,temp+i,temp+i,temp+i,temp+i,"[email protected]");  
                
             String str=String.format(Locale.CHINA,"__EVENTTARGET=%s&&__EVENTARGUMENT=%s",  
                 "myPager","2"); 
                
             
            // String str=String.format(Locale.CHINA,"__EVENTTARGET=%s&&__EVENTARGUMENT=%s&&__VIEWSTATE=%s",  
             // "myPager","2","/wEPDwULLTEwMDAxNjUwMTIPZBYCAgEPZBYGAgMPDxYCHgRUZXh0BWI8Zm9udCBjb2xvcj0nYmxhY2snPuezu+e7n+S4reespuWQiOadoeS7tjwvZm9udD4g6KKc5a2QPGZvbnQgY29sb3I9J2JsYWNrJz4g55qE5ZWG5ZOB5pyJ77yaPC9mb250PmRkAgcPDxYEHgtSZWNvcmRjb3VudALjOB4OQ3VzdG9tSW5mb1RleHQFkwHmgLvorrDlvZXmlbDvvJo8Zm9udCBjb2xvcj0iYmx1ZSI+PGI+NzI2NzwvYj48L2ZvbnQ+IOaAu+mhteaVsO+8mjxmb250IGNvbG9yPSJibHVlIj48Yj40ODU8L2I+PC9mb250PiDlvZPliY3pobXvvJo8Zm9udCBjb2xvcj0icmVkIj48Yj4xPC9iPjwvZm9udD5kZAIJDxYCHgdWaXNpYmxlaGRkF4izkjB6rJ5QSB71Ex0ebY3xzs4=");
             
             
                //String A="/wEPDwULLTEwMDAxNjUwMTIPZBYCAgEPZBYGAgMPDxYCHgRUZXh0BWI8Zm9udCBjb2xvcj0nYmxhY2snPuezu+e7n+S4reespuWQiOadoeS7tjwvZm9udD4g6KKc5a2QPGZvbnQgY29sb3I9J2JsYWNrJz4g55qE5ZWG5ZOB5pyJ77yaPC9mb250PmRkAgcPDxYEHgtSZWNvcmRjb3VudALjOB4OQ3VzdG9tSW5mb1RleHQFkwHmgLvorrDlvZXmlbDvvJo8Zm9udCBjb2xvcj0iYmx1ZSI+PGI+NzI2NzwvYj48L2ZvbnQ+IOaAu+mhteaVsO+8mjxmb250IGNvbG9yPSJibHVlIj48Yj40ODU8L2I+PC9mb250PiDlvZPliY3pobXvvJo8Zm9udCBjb2xvcj0icmVkIj48Yj4xPC9iPjwvZm9udD5kZAIJDxYCHgdWaXNpYmxlaGRkF4izkjB6rJ5QSB71Ex0ebY3xzs4=";
                
                
                System.out.println(str);
                
                
                //把数据写入  
                out.write(str);  
                out.flush();  
                out.close();  
  
                //到这里已经完成了，不过我们还是看看返回信息吧，他的注册返回信息也在此页面  
                //BufferedReader reader=new BufferedReader(new InputStreamReader(conn.getInputStream()));  
                BufferedReader reader;
                try {
                 reader=new BufferedReader(new InputStreamReader(conn.getInputStream())); 
                }
                catch (IOException e) {
                    if(conn.getResponseCode()==500)
                     reader=new BufferedReader(new InputStreamReader(conn.getErrorStream()));
                    else
                        throw e;
                }
                
                
                
                
                String line=null;  
                int lineNum=1;  
                
                while((line=reader.readLine())!=null)  
                {  
                    ++lineNum;  
  
                    //为什么只输出174行呢，因为这一行才是返回信息嘛，要其他的没用  
                    //if(lineNum==174)  
                    System.out.println(line);  
                }  
            
  
        }  
        catch (Exception x)  
        {  
            System.out.println(x.toString());  
        }  
          
    }  
  
}  
//代码如上所示啊。就是在目标网站无法翻页，求帮助，求解决啊。大家帮帮忙啊