Java でネットワーク関数を使用してネットワーク プログラミングを行う方法

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class Client {
    public static void main(String[] args) {
        String serverAddress = "127.0.0.1"; // 服务器IP地址
        int serverPort = 12345; // 服务器端口号

        try {
            // 创建Socket对象，连接服务器
            Socket socket = new Socket(serverAddress, serverPort);
            
            // 获取输入输出流
            InputStream inputStream = socket.getInputStream();
            OutputStream outputStream = socket.getOutputStream();
            
            // 向服务器发送数据
            outputStream.write("Hello Server".getBytes());
            
            // 接收服务器返回的数据
            byte[] buffer = new byte[1024];
            int len = inputStream.read(buffer);
            String receivedData = new String(buffer, 0, len);
            System.out.println("Received from server: " + receivedData);
            
            // 关闭连接
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) {
        int serverPort = 12345; // 服务器端口号

        try {
            // 创建ServerSocket对象，监听端口
            ServerSocket serverSocket = new ServerSocket(serverPort);
            System.out.println("Server started and listening on port " + serverPort);

            while (true) {
                // 接受客户端连接
                Socket socket = serverSocket.accept();
                System.out.println("Accepted connection from " + socket.getInetAddress());

                // 获取输入输出流
                InputStream inputStream = socket.getInputStream();
                OutputStream outputStream = socket.getOutputStream();

                // 接收客户端发送的数据
                byte[] buffer = new byte[1024];
                int len = inputStream.read(buffer);
                String receivedData = new String(buffer, 0, len);
                System.out.println("Received from client: " + receivedData);

                // 向客户端发送响应
                outputStream.write("Hello Client".getBytes());

                // 关闭连接
                socket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}