代码出现问题，急,求助!

我想从键盘读取字符串发送给服务器端,然后做个简单的处理(反序排列),然后回传给客户端,但是客户端这边却一直得不到回传的数据，请高手指点下，是哪里写错了.//服务器端
import java.net.Socket;
import java.net.ServerSocket;
import java.io.OutputStream;
import java.io.InputStream;
import java.io.BufferedWriter;
import java.io.BufferedReader;
import java.io.OutputStreamWriter;
import java.io.InputStreamReader;class Servicer implements Runnable 
{
Socket s;
public Servicer(Socket s)
{
this.s=s;
}
public void run()
{
try
{
OutputStream os=s.getOutputStream();
  OutputStreamWriter osw=new OutputStreamWriter(os);
  BufferedWriter bw=new BufferedWriter(osw);

  InputStream is=s.getInputStream();
  InputStreamReader isr=new InputStreamReader(is);
  BufferedReader br=new BufferedReader(isr);
  while(true)
  {
    String str=br.readLine();
    if(str.equalsIgnoreCase("quit"))
    {
     break;
    }
    bw.write(str+"---->");
    str=new StringBuffer(str).reverse().toString();
    bw.write(str);

    bw.close();
    br.close();
    s.close();
  }
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
}
class Test
{
public static void main(String []args) throws Exception 
{
ServerSocket ss=new ServerSocket(8001);
while(true)
{
Socket s=ss.accept();
new Thread(new Servicer(s)).start();
}
}
}//客户端
import java.net.Socket;
import java.net.ServerSocket;
import java.io.OutputStream;
import java.io.InputStream;
import java.io.BufferedWriter;
import java.io.BufferedReader;
import java.io.OutputStreamWriter;
import java.io.InputStreamReader;
import java.net.InetAddress;class ClientTest
{
public static void main(String []args) throws Exception 
  {
   if(args.length<2)
   {
   System.out.println("请输入服务器IP地址和端口");
   }
  
    Socket s=new Socket(args[0],Integer.parseInt(args[1]));
OutputStream os=s.getOutputStream();
  OutputStreamWriter osw=new OutputStreamWriter(os);
  BufferedWriter bw=new BufferedWriter(osw);

  InputStream is=s.getInputStream();
  InputStreamReader isr=new InputStreamReader(is);
  BufferedReader br=new BufferedReader(isr);  
  
  InputStreamReader isr1=new InputStreamReader(System.in);
  BufferedReader br1=new BufferedReader(isr1);
  
  while(true)
  {
   String str=br1.readLine();//从键盘读取字符串
        if(str.equalsIgnoreCase("quit"))
        {
         break;
        }
        bw.write(str);
        System.out.println(br.readLine());
  }
    bw.close();
    br.close();
    br1.close();
    s.close();   
}
}