服务器未检测到第二个客户端连接

问题描述

我的问题是，当我打开第二个客户端时，服务器似乎未检测到第二个客户端已打开。第一次打开客户端时，它可以正常工作，并且服务器检测到客户端已连接。

服务器：

public class Server {

Socket prevIoUsSocket = null;

private static int port = 9001;

public static void main(String[] args) throws Exception {
    ServerSocket serverSocket = new ServerSocket(port);
    System.out.println("[SERVER] Server successfully launched on port: " + port);
    
    DatagramSocket UDPSocket = new DatagramSocket(9002);
    
    Socket prevIoUsSocket = null;
    while (true) {
        Socket newSocket = serverSocket.accept();

       System.out.println("new client connected");
        
        
        if (prevIoUsSocket == null) { 
            prevIoUsSocket = newSocket;
            
            System.out.println("1 st client");
            
            
        } else {
            System.out.println("2 nd client");
            prevIoUsSocket = null;
        }
       
       
        byte[] data = new byte[500];
        DatagramPacket received = new DatagramPacket(data,data.length);
        
        while(true) {
            UDPSocket.receive(received);
            
            String receivedData = new String(received.getData());
            
            System.out.println(receivedData);
        }
    }
}
}

客户：

public ChatClient() throws UnkNownHostException,IOException {

    Socket socket = new Socket("127.0.0.1",9001);

    Scanner scanner = new Scanner(system.in);
    
    DatagramSocket UDPSocket = new DatagramSocket();
    
    while(scanner.hasNextLine()) {
        String message = scanner.nextLine();
        InetAddress ip = InetAddress.getByName("127.0.0.1");
                
        DatagramPacket packet = new DatagramPacket(message.getBytes(),message.getBytes().length,ip,9002);
        UDPSocket.send(packet);
    }
}

解决方法

以下循环永远不会结束，这就是您遇到问题的原因

        while(true) {
            UDPSocket.receive(received);
            
            String receivedData = new String(received.getData());
            
            System.out.println(receivedData);
        }