JAVA开发的代理程序

Question

import java.io.*;
import java.net.*;
import java.nio.charset.*;
import java.nio.*;
import java.util.regex.*;public class ProxyFrame 
{
    ServerSocket ss;
    boolean start=true;
    int localport=8080;
    
    public ProxyFrame()
    {
        try
        {
         ss=new ServerSocket(localport);
         while(start)
         {
                Socket client=ss.accept();
                //建立到客户端的管道
                InputStream from_client=client.getInputStream();
                OutputStream to_client=client.getOutputStream();
                
                //获取客户端的请求
                BufferedReader br=new BufferedReader(new InputStreamReader(from_client));
                String str=br.readLine();
                System.out.println(str);
                String urlstr=getURL(str);
                System.out.println(urlstr);
                URL url=new URL(urlstr);
                String host=url.getHost();
                System.out.println(host);
                int remoteport=url.getPort();
                if(remoteport==-1)
                {
                    remoteport=80;
                }
                System.out.println(remoteport);
                
                new ProxyThread(str,from_client,to_client,host,remoteport);
         }
        }
        catch(Exception ex)
        {
            System.out.println(ex);
        }
    }
    
    public String getURL(String str)
    {
        String str2="";
        Pattern p = Pattern.compile("http://[a-z|A-Z]+[.][a-z]+[.][a-z|a-z]+");
        Matcher m = p.matcher(str);
        boolean result=m.find();
        if(result)
        {
            str2=m.group();
        }
        return str2;
    }
    
    public static void main(String args[])
    {
        new ProxyFrame();
    }
}
 import java.net.*;
import java.io.*;public class ProxyThread implements Runnable
{
    String str;
    InputStream from_client;
    OutputStream to_client;
    String host;
    int port;
    
    
    public ProxyThread(String str,InputStream from_client,OutputStream to_client,String host,int port)
    {
        this.str=str;
        this.from_client=from_client;
        this.to_client=to_client;
        this.host=host;
        this.port=port;
        Thread t=new Thread(this);
        t.start();
    }
    
    public void run()
    {
        try
        {
            //建立到服务器的管道
         Socket server=new Socket(host,port);
         InputStream from_server=server.getInputStream();
         OutputStream to_server=server.getOutputStream();
         
         //发送请求
         int read_byte;
         to_server.write(str.getBytes());
         to_server.write(' ');
         to_server.flush();
         to_server.close();
         
         //接收返回
         byte[] reply=new byte[4096];
         while((read_byte=from_server.read(reply))!=-1)
         {
             System.out.println(read_byte);
             to_client.write(reply,0,read_byte);
             to_client.flush();
         }
         to_client.close();
        }
        catch(Exception ex)
        {
            System.out.println(ex);
        }
    }
}    服务器端启动后可以接收来自客户端的请求，但客户端的浏览器状态栏始终显示“正在打开网页.......”,不知哪位大侠可否指点