Python如何向IP地址发送字符串

import socket  
# 目标IP地址和端口  
target_ip = '192.168.1.100'  
target_port = 12345  
# 要发送的字符串  
message = 'Hello, this is a TCP message!'  
# 创建socket对象  
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
# 连接到服务器  
client_socket.connect((target_ip, target_port))  
# 发送数据  
client_socket.sendall(message.encode('utf-8'))  
# 关闭连接  
client_socket.close()  
print(f'Message "{message}" sent to {target_ip}:{target_port} via TCP.')

import socket  
# 目标IP地址和端口  
target_ip = '192.168.1.100'  
target_port = 12345  
# 要发送的字符串  
message = 'Hello, this is a UDP message!'  
# 创建socket对象  
client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  
# 发送数据  
client_socket.sendto(message.encode('utf-8'), (target_ip, target_port))  
# 关闭socket（对于UDP，这一步通常是可选的，因为UDP是无连接的）  
client_socket.close()  
print(f'Message "{message}" sent to {target_ip}:{target_port} via UDP.')

import socket  
def send_tcp_message(ip, port, message):  
    """  
    通过TCP发送字符串到指定的IP地址和端口。  
    :param ip: 目标IP地址  
    :param port: 目标端口号  
    :param message: 要发送的字符串  
    """  
    try:  
        # 创建socket对象  
        client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
        # 连接到服务器  
        client_socket.connect((ip, port))  
        # 发送数据（需要先编码为字节）  
        client_socket.sendall(message.encode('utf-8'))  
        # 假设服务器会发送回一些数据（这里只是为了演示接收）  
        response = client_socket.recv(1024).decode('utf-8')  
        print(f'Received from server: {response}')  
    except Exception as e:  
        print(f'An error occurred: {e}')  
    finally:  
        # 关闭socket  
        client_socket.close()  
# 使用函数  
target_ip = '192.168.1.100'  
target_port = 12345  
message = 'Hello, this is a TCP message!'  
send_tcp_message(target_ip, target_port, message)

import socket  
def send_udp_message(ip, port, message):  
    """  
    通过UDP发送字符串到指定的IP地址和端口。  
    :param ip: 目标IP地址  
    :param port: 目标端口号  
    :param message: 要发送的字符串  
    """  
    try:  
        # 创建socket对象  
        client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  
        # 发送数据（需要先编码为字节）  
        client_socket.sendto(message.encode('utf-8'), (ip, port))  
    except Exception as e:  
        print(f'An error occurred: {e}')  
    finally:  
        # 对于UDP，关闭socket是可选的，但通常是个好习惯  
        client_socket.close()  
# 使用函数  
target_ip = '192.168.1.100'  
target_port = 12345  
message = 'Hello, this is a UDP message!'  
send_udp_message(target_ip, target_port, message)