import socket

# 创建Socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 绑定到本地地址和端口
s.bind(('localhost', 12345))

# 监听连接
s.listen(5)

# 接受连接
clientsocket, address = s.accept()

# 发送数据
clientsocket.send("Hello World".encode())

# 关闭Socket
clientsocket.close()
s.close()

import java.net.ServerSocket;
import java.net.Socket;
import java.io.OutputStream;
import java.io.PrintWriter;

public class Server {
    public static void main(String[] args) throws Exception {
        // 创建ServerSocket
        ServerSocket serverSocket = new ServerSocket(12345);

        // 接受连接
        Socket clientSocket = serverSocket.accept();

        // 发送数据
        OutputStream outputStream = clientSocket.getOutputStream();
        PrintWriter printWriter = new PrintWriter(outputStream, true);
        printWriter.println("Hello World");

        // 关闭Socket
        printWriter.close();
        clientSocket.close();
        serverSocket.close();
    }
}

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <iostream>

int main() {
    // 创建Socket
    int server_fd = socket(AF_INET, SOCK_STREAM, 0);

    // 定义地址结构
    struct sockaddr_in address;
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(12345);

    // 绑定Socket到地址
    bind(server_fd, (struct sockaddr *)&address, sizeof(address));

    // 监听连接
    listen(server_fd, 3);

    // 接受连接
    int addrlen = sizeof(address);
    int new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);

    // 发送数据
    std::string hello = "Hello World";
    send(new_socket, hello.c_str(), hello.size(), 0);

    // 关闭Socket
    close(new_socket);
    close(server_fd);

    return 0;
}