java实现基于TCP的C/S通信

1. 服务端代码：

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

public class Server {
    public static void main(String args[]) throws Exception {
        ServerSocket server = new ServerSocket(8888); // 创建服务端Socket对象，指定端口号

        System.out.println("等待客户端连接...");

        Socket socket = server.accept(); // 监听客户端请求，返回Socket对象

        System.out.println("客户端连接成功！");

        // 获取输入输出流
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintStream out = new PrintStream(socket.getOutputStream());

        String line = null;

        while ((line = in.readLine()) != null) { // 循环读取客户端消息
            System.out.println("客户端发送的消息：" + line);
            out.println("服务端已接收到消息：" + line); // 发送响应消息
        }

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

2. 客户端代码：

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

public class Client {
    public static void main(String args[]) throws Exception {
        Socket socket = new Socket("127.0.0.1", 8888); // 创建客户端Socket对象，指定服务端IP和端口号

        // 获取输入输出流
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintStream out = new PrintStream(socket.getOutputStream());

        out.println("Hello, Server!"); // 发送消息给服务端

        String response = in.readLine(); // 接收服务端响应消息

        System.out.println("服务端返回的消息：" + response);

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