Java聊天室简易实现代码

以下是一个简单的Java局域网聊天室的实现代码，包括服务器端和客户端：

服务器端代码：

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 List<Socket> clients = new ArrayList<>();
    private ServerSocket serverSocket;
    
    public ChatServer(int port) {
        try {
            serverSocket = new ServerSocket(port);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public void start() {
        System.out.println("Server is running...");
        while (true) {
            try {
                Socket client = serverSocket.accept();
                clients.add(client);
                new ServerThread(client).start();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    private class ServerThread extends Thread {
        private Socket client;
        private BufferedReader in;
        private PrintWriter out;
        
        public ServerThread(Socket client) {
            this.client = client;
            try {
                in = new BufferedReader(new InputStreamReader(client.getInputStream()));
                out = new PrintWriter(client.getOutputStream(), true);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
        public void run() {
            String line;
            try {
                while ((line = in.readLine()) != null) {
                    System.out.println("Received message: " + line);
                    for (Socket c : clients) {
                        PrintWriter pw = new PrintWriter(c.getOutputStream(), true);
                        pw.println(line);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static void main(String[] args) {
        ChatServer server = new ChatServer(8888);
        server.start();
    }
}

客户端代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class ChatClient {
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;
    private String host;
    private int port;
    
    public ChatClient(String host, int port) {
        this.host = host;
        this.port = port;
    }
    
    public void start() {
        try {
            socket = new Socket(host, port);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);
            
            new ClientThread().start();
            
            BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
            String line;
            while ((line = stdin.readLine()) != null) {
                out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    private class ClientThread extends Thread {
        public void run() {
            String line;
            try {
                while ((line = in.readLine()) != null) {
                    System.out.println(line);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static void main(String[] args) {
        ChatClient client = new ChatClient("localhost", 8888);
        client.start();
    }
}

需要注意的是，这只是一个简单的实现，还需要考虑一些安全和性能问题，比如数据加密、多线程处理等。