java局域网聊天程序

实现Java局域网聊天程序可以使用Socket编程，具体步骤如下：

1. 创建ServerSocket对象，指定端口号，等待客户端连接。
2. 创建Socket对象，指定服务器IP地址和端口号，连接服务器。
3. 通过输入输出流进行数据传输。
4. 关闭Socket和ServerSocket对象。

以下是一个简单的Java局域网聊天程序的示例代码：

服务端代码：

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

public class Server {
    public static void main(String[] args) throws Exception {
        ServerSocket server = new ServerSocket(8888);
        System.out.println("服务器已启动，等待客户端连接...");

        Socket socket = server.accept();
        System.out.println("客户端已连接");

        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String line;
        while ((line = reader.readLine()) != null) {
            out.println(line);
            System.out.println("发送消息：" + line);
            System.out.println("接收消息：" + in.readLine());
        }

        in.close();
        out.close();
        socket.close();
        server.close();
    }
}

客户端代码：

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

public class Client {
    public static void main(String[] args) throws Exception {
        Socket socket = new Socket("127.0.0.1", 8888);
        System.out.println("已连接服务器");

        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String line;
        while ((line = reader.readLine()) != null) {
            out.println(line);
            System.out.println("发送消息：" + line);
            System.out.println("接收消息：" + in.readLine());
        }

        in.close();
        out.close();
        socket.close();
    }
}