import socket

# 创建 socket 对象
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 绑定主机和端口
server_address = ('localhost', 12345)
server_socket.bind(server_address)

# 设置最大连接数
server_socket.listen(5)

print("Server is listening on", server_address)

while True:
    # 等待客户端连接
    client_socket, client_address = server_socket.accept()
    print("Connection from", client_address)

    # 接收数据
    data = client_socket.recv(1024)
    print("Received:", data.decode('utf-8'))

    # 发送响应
    response = "Hello, client!"
    client_socket.send(response.encode('utf-8'))

    # 关闭连接
    client_socket.close()

import socket

# 创建 socket 对象
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 连接到服务器
server_address = ('localhost', 12345)
client_socket.connect(server_address)

# 发送数据
message = "Hello, server!"
client_socket.send(message.encode('utf-8'))

# 接收响应
response = client_socket.recv(1024)
print("Server response:", response.decode('utf-8'))

# 关闭连接
client_socket.close()

import socket

# 创建 socket 对象
server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

# 绑定主机和端口
server_address = ('localhost', 12345)
server_socket.bind(server_address)

print("UDP Server is listening on", server_address)

while True:
    # 接收数据
    data, client_address = server_socket.recvfrom(1024)
    print("Received:", data.decode('utf-8'), "from", client_address)

    # 发送响应
    response = "Hello, client!"
    server_socket.sendto(response.encode('utf-8'), client_address)

import socket

# 创建 socket 对象
client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

# 发送数据
message = "Hello, server!"
client_socket.sendto(message.encode('utf-8'), ('localhost', 12345))

# 接收响应
response, server_address = client_socket.recvfrom(1024)
print("Server response:", response.decode('utf-8'), "from", server_address)

# 关闭连接
client_socket.close()