Java服务器套接字上的聊天室

以下是一个使用Java编写的简单的聊天室示例，使用ServerSocket和Socket实现。该聊天室允许多个客户端连接到服务器，并在客户端之间发送消息。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class ChatServer {
    private ServerSocket serverSocket;
    private List<ClientHandler> clients;

    public ChatServer(int port) {
        try {
            serverSocket = new ServerSocket(port);
            clients = new ArrayList<>();
            System.out.println("Chat Server started on port " + port);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {
        while (true) {
            try {
                Socket clientSocket = serverSocket.accept();
                System.out.println("New client connected: " + clientSocket);
                ClientHandler clientHandler = new ClientHandler(clientSocket);
                clients.add(clientHandler);
                new Thread(clientHandler).start();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void broadcastMessage(String message) {
        for (ClientHandler client : clients) {
            client.sendMessage(message);
        }
    }

    private class ClientHandler implements Runnable {
        private Socket clientSocket;
        private BufferedReader reader;
        private PrintWriter writer;

        public ClientHandler(Socket clientSocket) {
            try {
                this.clientSocket = clientSocket;
                reader = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                writer = new PrintWriter(clientSocket.getOutputStream(), true);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void run() {
            try {
                String message;
                while ((message = reader.readLine()) != null) {
                    System.out.println("Received message from client: " + message);
                    broadcastMessage(message);
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    clientSocket.close();
                    clients.remove(this);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        public void sendMessage(String message) {
            writer.println(message);
        }
    }

    public static void main(String[] args) {
        ChatServer chatServer = new ChatServer(12345);
        chatServer.start();
    }
}

在上面的示例中，ChatServer类表示聊天服务器。它使用ServerSocket在指定的端口上监听传入的连接请求。当客户端连接到服务器时，服务器创建一个新的ClientHandler线程来处理该客户端的消息。ClientHandler类负责与客户端进行通信，并将接收到的消息广播给所有其他客户端。服务器可以通过调用broadcastMessage方法来广播消息给所有客户端。

请注意，此示例仅用于演示目的，可能需要进行进一步的优化和改进，例如处理客户端断开连接的情况等。