生成一个Java基于UDP协议的简单聊天程序

以下是一个基于UDP协议的简单聊天程序的Java代码示例：

服务端代码：

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

public class UDPServer {
    public static void main(String[] args) throws IOException {
        // 创建UDP套接字
        DatagramSocket serverSocket = new DatagramSocket(8888);

        byte[] receiveData = new byte[1024];
        byte[] sendData = new byte[1024];

        while (true) {
            // 接收客户端发送的数据
            DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
            serverSocket.receive(receivePacket);

            String message = new String(receivePacket.getData());
            System.out.println("Received message from " + receivePacket.getAddress() + ": " + message);

            // 发送响应数据给客户端
            InetAddress clientAddress = receivePacket.getAddress();
            int clientPort = receivePacket.getPort();

            String responseMessage = "Hello from server!";
            sendData = responseMessage.getBytes();
            DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, clientAddress, clientPort);
            serverSocket.send(sendPacket);
        }
    }
}

客户端代码：

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

public class UDPClient {
    public static void main(String[] args) throws IOException {
        // 创建UDP套接字
        DatagramSocket clientSocket = new DatagramSocket();

        byte[] receiveData = new byte[1024];
        byte[] sendData = new byte[1024];

        while (true) {
            // 发送数据给服务端
            InetAddress serverAddress = InetAddress.getByName("127.0.0.1");
            int serverPort = 8888;

            String message = "Hello from client!";
            sendData = message.getBytes();
            DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverAddress, serverPort);
            clientSocket.send(sendPacket);

            // 接收服务端发送的响应数据
            DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
            clientSocket.receive(receivePacket);

            String responseMessage = new String(receivePacket.getData());
            System.out.println("Received message from " + receivePacket.getAddress() + ": " + responseMessage);
        }
    }
}

在这个聊天程序中，服务端和客户端均使用UDP套接字进行通信。服务端首先创建一个UDP套接字，并绑定到指定的端口号。然后进入一个无限循环，等待接收客户端发送的数据。当服务端接收到客户端发送的数据后，它会打印出接收到的消息，并将响应消息发送给客户端。

客户端创建一个UDP套接字，并指定服务端的IP地址和端口号，然后进入一个无限循环，等待用户输入要发送的消息。当客户端输入消息后，它会将消息发送给服务端，并等待服务端的响应。当客户端接收到服务端的响应后，它会打印出接收到的消息。