Question

我从互联网上的某些来源获取代码，现在是：

服务器端：

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

class Server {
    public static void main(String args[]) throws Exception {
        DatagramSocket serverSocket = new DatagramSocket(9876);
        serverSocket.setBroadcast(true);
        byte[] receiveData = new byte[1024];
        byte[] sendData = new byte[1024];

        while (true) {
            DatagramPacket receivePacket = new DatagramPacket(receiveData,
                    receiveData.length);
            serverSocket.receive(receivePacket);
            //System.out.println(serverSocket.getAddress().getHostAddress());
                System.out.println(receivePacket.getAddress().getHostAddress()+" is connected");
            String sentence = new String(receivePacket.getData(), 0, receivePacket.getLength());
            System.out.println("RECEIVED: " + sentence +" from: "+receivePacket.getAddress().getHostAddress());

            InetAddress IPAddress = receivePacket.getAddress();
            int port = receivePacket.getPort();
            System.out.println("Port: "+port);
            String capitalizedSentence = sentence.toUpperCase();
            sendData = capitalizedSentence.getBytes();


            DatagramPacket sendPacket = new DatagramPacket(sendData,sendData.length, IPAddress, port); //
            serverSocket.send(sendPacket);
        }
    }
}

Client1方：

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

class Client1 {
    public static void main(String args[]) throws Exception {
        BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
        DatagramSocket clientSocket = new DatagramSocket();
        clientSocket.setBroadcast(true);
        InetAddress IPAddress = InetAddress.getByName("localhost");
        byte[] sendData = new byte[1024];
        byte[] receiveData = new byte[1024];
        Boolean status = true;

        while(status){
        String sentence = "";
        sentence = inFromUser.readLine();
        if(sentence.equals("exit")){
            break;
        }
        sendData = sentence.getBytes();
        DatagramPacket sendPacket = new DatagramPacket(sendData,sendData.length, IPAddress, 9876);
        clientSocket.send(sendPacket);
        DatagramPacket receivePacket = new DatagramPacket(receiveData,receiveData.length);
        clientSocket.receive(receivePacket);
        String modifiedSentence = new String(receivePacket.getData(), 0, receivePacket.getLength());
        System.out.println("FROM SERVER:" + modifiedSentence);
        }

        clientSocket.close();
    }
}

Client2 Side：与Client1相同。

我的问题是：

如何在服务器端发出通知，告知客户端连接时客户端的IP地址？
如何从一个客户端向其他客户端广播消息？例如：Client1向Server发送消息，Server将消息广播给其所有客户端，而不仅仅是Client1。

提前谢谢

如何在连接客户端时在服务器中发出通知以及如何向其他客户端广播消息（Java套接字连接UDP）？

0 个答案: