java聊天室系统实现

Java聊天室系统可以通过Socket编程实现。以下是一个简单的例子：

1. 服务端代码

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

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(6666);
        System.out.println("服务器已启动");

        while (true) {
            Socket socket = serverSocket.accept();
            System.out.println("客户端连接成功：" + socket.getInetAddress().getHostAddress());

            BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            String message;
            while ((message = reader.readLine()) != null) {
                System.out.println("客户端说：" + message);
            }
        }
    }
}

2. 客户端代码

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

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1", 6666);
        System.out.println("连接服务器成功");

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);
        String message;
        while ((message = reader.readLine()) != null) {
            writer.println(message);
        }
    }
}

以上代码实现了一个简单的聊天室系统，客户端连接服务器后可以输入消息发送给服务器，服务器将消息打印到控制台上。