为什么我在运行时，会没有反应？？好像出现死锁了！
客户端：
import java.net.*;
import java.io.*;

class Client
{      
      Socket S;
        BufferedReader BR;
        PrintWriter BW;
        InputStream IS;
        OutputStream OS;

      public void put()
      {
            try
            {
                      Socket S=new Socket(InetAddress.getByName(null),6000);
                      IS=S.getInputStream();
                      OS=S.getOutputStream();
                      BR=new BufferedReader(new InputStreamReader(IS));
                    BW=new PrintWriter(OS);
                    BW.print("Hello");
                    System.out.println(BR.readLine());
                    BR.close();
                    BW.close();
                    IS.close();
                    OS.close();
                    S.close();
            }
            catch(Exception e)
            {
                    e.printStackTrace();
            }
      }
        public static void main(String[] args)
        {
                Client S1=new Client();    
              S1.put();
        }
}
服务器段：
import java.net.*;
import java.io.*; 

class Server
{
        public void pet()
        {
                Socket So;
                BufferedReader BR;
                PrintWriter BW;
                InputStream IS;
                OutputStream OS;
        
                try
                {
                        ServerSocket ss=new ServerSocket(6000);
                        So=ss.accept();
                        IS=So.getInputStream();
                        OS=So.getOutputStream();
                    BR=new BufferedReader(new InputStreamReader(IS));
                    BW=new PrintWriter(OS);        
                    BW.print("Welcome to here!!");
                    System.out.print(BR.readLine());
                    BR.close();
                    BW.close();
                    IS.close();
                    OS.close();
                    So.close();
                    ss.close();
                }
                catch(Exception e)
                {
                        e.printStackTrace();
                }
        }
        public static void main(String[] args)
        {
                Server S1=new Server();    
              S1.pet();
        }
}