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错误图片：图片

我正在创建一个与 2 个客户端的多线程客户端服务器聊天。程序没有错误，但我发送的消息没有到达客户端，我该怎么办？写你好＃客户端1消息应该到达第二个客户端，但它没有。如何更改客户名称？下面我分别留下我写的服务器和客户端的文件：

import java.io.*; 
import java.util.*; 
import java.net.*;



public class Server{


static Vector<ClientHandler> lc = new Vector<>();

static int i = 0; 

public static void main(String[] args) throws UnknownHostException, IOException{

    ServerSocket ss = new ServerSocket(2104);

    while (true){

        Socket s = ss.accept(); 
        System.out.println("Ricevuta nuova richiesta del client " + s);

        DataInputStream dis = new DataInputStream(s.getInputStream()); 
        DataOutputStream dos = new DataOutputStream(s.getOutputStream());

        ClientHandler ch = new ClientHandler(s,"Client numero" + i, dis, dos);

        Thread t = new Thread(ch); 
          
        System.out.println("Il client si sta aggiungendo alla lista");

        lc.add(ch);

        t.start();

        i++;
    } 
} 
} 







class ClientHandler implements Runnable{ 
Scanner scn = new Scanner(System.in); 
private String name; 
final DataInputStream dis; 
final DataOutputStream dos; 
Socket s; 
boolean login; 
  

public ClientHandler(Socket s, String name, DataInputStream dis, DataOutputStream dos){ 
    this.dis = dis; 
    this.dos = dos; 
    this.name = name; 
    this.s = s; 
    this.login=true; 
}


@Override
public void run(){
    String ricevuta; 
    while (true){
        try{ 

            ricevuta = dis.readUTF(); 

            System.out.println(ricevuta); 

            if(ricevuta.equals("logout")){ 
                this.login=false; 
                this.s.close(); 
                break; 
            } 
            

            StringTokenizer st = new StringTokenizer(ricevuta, "#"); 
            String MsgToSend = st.nextToken(); 
            String recipient = st.nextToken(); 


            for (ClientHandler mc : Server.lc){ 

                if (mc.name.equals(recipient) && mc.login==true){ 
                    mc.dos.writeUTF(this.name+ " : " +MsgToSend); 
                    break; 
                } 
            } 
        } catch (IOException e){ 
            e.printStackTrace(); 
        }
    } 
    try{ 

        this.dis.close(); 
        this.dos.close(); 
          
    }catch(IOException e){ 
        e.printStackTrace(); 
    } 
} 
}






import java.io.*; 

import java.net.*; 

import java.util.Scanner;


public class Client {
final static int ServerPort = 2104; 
public static void main(String args[]) throws UnknownHostException, IOException{ 


Scanner scn = new Scanner(System.in);

InetAddress ip = InetAddress.getByName("localhost"); 
      

    Socket s = new Socket(ip, ServerPort); 
      

    DataInputStream dis = new DataInputStream(s.getInputStream()); 
    DataOutputStream dos = new DataOutputStream(s.getOutputStream()); 

    
    
    

    Thread sendMessage = new Thread(new Runnable(){ 
        @Override
        public void run(){ 
            while (true){

                String messaggio = scn.nextLine();
                try { 

                    dos.writeUTF(messaggio); 
                } catch (IOException e){ 
                    e.printStackTrace(); 
                } 
            } 
        } 
    }); 
      
    
    
    

    Thread readMessage = new Thread(new Runnable(){ 
        @Override
        public void run(){
            while (true){ 
                try { 

                    String messaggio = dis.readUTF(); 
                    System.out.println(messaggio); 
                } catch (IOException e){
                    e.printStackTrace(); 
                } 
            } 
        } 
    }); 


    sendMessage.start(); 
    readMessage.start();
}
}
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