Java ネットワーク プログラミングの一般的なプロトコルは何ですか?

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

public class Server {
    public static void main(String[] args) throws IOException {
        // 创建服务器套接字并监听端口
        ServerSocket serverSocket = new ServerSocket(1234);

        // 无限循环，等待客户端连接
        while (true) {
            // 接受客户端连接
            Socket clientSocket = serverSocket.accept();

            // 创建输入流读取客户端消息
            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

            // 创建输出流发送消息到客户端
            PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);

            // 读取客户端消息并打印到控制台
            String message = in.readLine();
            System.out.println("Received message: " + message);

            // 向客户端发送应答消息
            out.println("Hello from server!");

            // 关闭套接字和流
            clientSocket.close();
            in.close();
            out.close();
        }
    }
}

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

public class Client {
    public static void main(String[] args) throws IOException {
        // 创建客户端套接字并连接到服务器
        Socket clientSocket = new Socket("localhost", 1234);

        // 创建输出流发送消息到服务器
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);

        // 创建输入流读取服务器消息
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

        // 向服务器发送消息
        out.println("Hello from client!");

        // 读取服务器应答消息并打印到控制台
        String message = in.readLine();
        System.out.println("Received message: " + message);

        // 关闭套接字和流
        clientSocket.close();
        in.close();
        out.close();
    }
}