JAVA 中多线程服务端 多个客户端的实现

服务端代码：
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

class ServeOneClient extends Thread...{
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;

    public ServeOneClient(Socket s) throws IOException...{
        socket=s;
        in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
        out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);
        start();
    }

            
    public void run()...{
        try...{
            while(true)...{
                String str=in.readLine();
                if(str.equals("END")) break;
                System.out.println("Echoing:"+str);
                out.println(str);
                                yield();
            }
            System.out.println("closing......");
        }catch(IOException e)...{}
        finally...{
            try...{
                socket.close();
            }catch(IOException e)...{}
        }
    }
}


public class ThreadServerTest...{
    static final int PORT=8888;
    
    public static void main(String[] args) throws IOException...{
        ServerSocket s=new ServerSocket(PORT);
        System.out.println("Server Started");
        try...{
            while(true)...{
                Socket socket=s.accept();
                try...{
                    new ServeOneClient(socket);
                }catch(IOException e)...{
                    socket.close();
                }
            }
        }finally...{
            s.close();
        }
    }
} 
客户端代码：
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;

class ClientThread...{
    private Socket socket;
//    private BufferedReader in;
    private PrintWriter out;
        int i=0;
        
    public ClientThread(InetAddress addr)...{
        try...{
            socket=new Socket(addr,ThreadServerTest.PORT);
        }catch(IOException e)...{}    
        try...{
        //    in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);       
                            while(true)...{
                out.println("Client"+": AAA"+(i++));//把AAA改动一下，以便看出不同客户端的访问
                                }                  
        }catch(IOException e)...{
            try...{
                socket.close();
            }catch(IOException e2)...{}
        }
    }
    
}
    
public class Num1...{
    public static void main(String[] args) throws IOException,InterruptedException...{
        InetAddress addr=InetAddress.getByName(null);
                new ClientThread(addr);
    }
}