Python socket网络编程

        import socket
        socket.TCP/IP
        connect(a.ip, a.port)
        socket.send(hello)
        socket.recv()
        socket.close()

        import socket
        socket.TCP/IP
        listen(0.0.0.0, 3306)
        waiting()
        recv()
        send

 1 # 服务器端
 2 import socket
 3 
 4 server = socket.socket()
 5 server.bind((‘localhost‘, 5520))  # 绑定要监听端口
 6 server.listen(5)  # 监听
 7 
 8 print("我要开始等电话了")
 9 while True:
10     conn, addr = server.accept()  # 等电话打进来
11     # conn就是客户端连过来二在服务器端为其生成的一个连接实例
12 
13     print("电话来了")
14     while True:
15         data = conn.recv(1024)
16         print("recv:", data.decode())
17         if not data:
18             print("client has lost...")
19             break
20         conn.send(data.upper())
21 
22 server.close()

# 客户端
import socket

client = socket.socket()  # 声明socket类型，同时生成socket连接对象
client.connect((‘localhost‘, 5520))

while True:
    msg = input(">>:").strip()
    if len(msg) == 0:
        continue
    # client.send(b"Hello World!")
    client.send(msg.encode(encoding="utf-8"))
    data = client.recv(1024)
    print("recv:", data.decode())

client.close()

import socket
import os
import time

server = socket.socket()
server.bind((‘localhost‘, 9999))

server.listen()

while True:
    conn, addr = server.accept()
    print("new conn:", addr)
    while True:
        print("等待新指令")
        data = conn.recv(1024)
        if not data:
            print("客户端已断开")
            break
        print("执行指令:", data)
        cmd_res = os.popen(data.decode()).read()  #接受字符串，执行结果还是字符串
        if len(cmd_res) == 0:
            cmd_res = "cmd hs no output..."
        conn.send(str(len(cmd_res.encode())).encode("utf-8"))     # 先发大小给客户端
        # time.sleep(0.5)
        client_ack = conn.recv(1024)   # wait client to confirm

        conn.send(cmd_res.encode("utf-8"))

server.close()

import socket

client = socket.socket()

client.connect((‘localhost‘, 9999))

while True:
    cmd = input(">>:").strip()
    if len(cmd) == 0:
        continue
    client.send(cmd.encode("utf-8"))
    cmd_res_size = client.recv(1024)  # 接受命令结果的长度
    print("命令结果大小:", cmd_res_size)
    client.send("准备好接受了".encode("utf-8"))
    received_size = 0
    received_data = b‘‘
    while received_size < int(cmd_res_size.decode()):
        data = client.recv(1024)
        received_size += len(data)  # 每次收到的有可能小于1024，所以必须用len判断
        # print(data.decode())
        received_data += data
    else:
        print("cmd res receive done...", received_size)
        print(received_data.decode())
    # cmd_res = client.recv(1024)

    # print(cmd_res.decode())

client.close()