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Python 零基础100天—Day39 网络基础

  • 2026-06-27 23:42:35
Python 零基础100天—Day39 网络基础

🐍 网络基础 — socket 编程入门

🕐 预计用时:2-3 小时 | 🎯 目标:掌握 TCP/IP 概念、socket 模块、简易客户端/服务端


📖 今日目录

  1. 网络通信基础
  2. TCP vs UDP
  3. socket 模块入门
  4. 简易 TCP 服务端
  5. 简易 TCP 客户端
  6. TCP 聊天室
  7. UDP 通信
  8. socket 超时处理
  9. 实战:文件传输
  10. 今日小结

1. 网络通信基础

网络通信的本质就是两台电脑之间收发数据。

概念
说明
类比
IP 地址
设备的网络地址
门牌号
端口 (Port)
设备上某个程序的入口
房间号
协议 (Protocol)
通信规则
语言
Socket
网络通信的接口
电话
TCP
可靠、有序、面向连接
打电话(必须接通才能说话)
UDP
快速、无连接、不保证送达
发短信(发出去就不管了)
# 一次网络通信的流程
# 服务端:                          客户端:
# 1. 创建 socket                   1. 创建 socket
# 2. 绑定 IP:端口                  2. 连接服务端
# 3. 监听                          3. 发送数据
# 4. 接受连接                      4. 接收响应
# 5. 收发数据                      5. 关闭连接
# 6. 关闭连接

2. TCP vs UDP

特性
TCP
UDP
连接方式
面向连接(三次握手)
无连接
可靠性
可靠(保证送达)
不保证
顺序
保证顺序
不保证
速度
较慢
较快
适用场景
网页、文件传输、邮件
视频、游戏、DNS
Python
SOCK_STREAMSOCK_DGRAM

3. socket 模块入门

import socket

# 创建 socket 对象
# AF_INET = IPv4, SOCK_STREAM = TCP
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 查看本机 IP
hostname = socket.gethostname()
local_ip = socket.gethostbyname(hostname)
print(f"主机名: {hostname}")
print(f"本机 IP: {local_ip}")

# 关闭 socket
s.close()
# 常用 socket 方法
# 服务端:
# s.bind((host, port))   — 绑定地址
# s.listen(n)            — 开始监听
# s.accept()             — 接受连接,返回 (conn, addr)
# conn.recv(bufsize)     — 接收数据
# conn.send(data)        — 发送数据
# conn.close()           — 关闭连接

# 客户端:
# s.connect((host, port)) — 连接服务端
# s.send(data)            — 发送数据
# s.recv(bufsize)         — 接收数据
# s.close()               — 关闭连接

4. 简易 TCP 服务端

import socket

def start_server(host="127.0.0.1", port=9999):
    """简易 TCP 服务端"""
    # 1. 创建 socket
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    # 允许端口复用(避免 "Address already in use")
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

    # 2. 绑定地址
    server.bind((host, port))

    # 3. 开始监听(参数是等待队列的最大长度)
    server.listen(5)
    print(f"🖥️ 服务器启动: {host}:{port}")
    print(f"📡 等待客户端连接...\n")

    try:
        while True:
            # 4. 接受客户端连接(阻塞)
            conn, addr = server.accept()
            print(f"✅ 客户端已连接: {addr}")

            # 5. 收发数据
            while True:
                data = conn.recv(1024)  # 最多接收 1024 字节
                if not data:
                    break  # 客户端断开

                message = data.decode("utf-8")
                print(f"📩 收到: {message}")

                # 回复客户端
                response = f"服务器已收到: {message}"
                conn.send(response.encode("utf-8"))

            # 6. 关闭连接
            conn.close()
            print(f"❌ 客户端断开: {addr}\n")

    except KeyboardInterrupt:
        print("\n🛑 服务器关闭")
    finally:
        server.close()

# 运行服务器
start_server()

5. 简易 TCP 客户端

import socket

def start_client(host="127.0.0.1", port=9999):
    """简易 TCP 客户端"""
    # 1. 创建 socket
    client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    try:
        # 2. 连接服务器
        client.connect((host, port))
        print(f"✅ 已连接到 {host}:{port}")

        while True:
            # 3. 发送数据
            message = input("📤 输入消息 (quit退出): ")
            if message.lower() == "quit":
                break

            client.send(message.encode("utf-8"))

            # 4. 接收响应
            data = client.recv(1024)
            print(f"📩 响应: {data.decode('utf-8')}")

    except ConnectionRefusedError:
        print("❌ 连接失败:服务器未启动")
    finally:
        client.close()
        print("🔌 已断开连接")

# 运行客户端
start_client()

⚠️ 测试方法:开两个终端窗口,一个运行服务器,一个运行客户端。先启动服务器,再启动客户端。


6. TCP 聊天室

# ---- 服务端:多客户端聊天室 ----
import socket
import threading

clients = {}  # {conn: name}
lock = threading.Lock()

def broadcast(message, exclude=None):
    """广播消息给所有客户端"""
    with lock:
        for conn in clients:
            if conn != exclude:
                try:
                    conn.send(message.encode("utf-8"))
                except:
                    pass

def handle_client(conn, addr):
    """处理单个客户端"""
    try:
        conn.send("请输入你的昵称: ".encode("utf-8"))
        name = conn.recv(1024).decode("utf-8").strip()

        with lock:
            clients[conn] = name

        broadcast(f"📢 {name} 加入了聊天室!")
        print(f"✅ {name} ({addr}) 已连接")

        while True:
            data = conn.recv(1024)
            if not data:
                break

            message = data.decode("utf-8")
            broadcast(f"[{name}] {message}", exclude=conn)
            print(f"[{name}] {message}")

    except Exception as e:
        print(f"❌ {addr} 错误: {e}")
    finally:
        with lock:
            name = clients.pop(conn, "未知")
        conn.close()
        broadcast(f"📢 {name} 离开了聊天室")
        print(f"❌ {name} 已断开")

def start_chat_server(host="127.0.0.1", port=9999):
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server.bind((host, port))
    server.listen(10)
    print(f"💬 聊天室服务器启动: {host}:{port}")

    try:
        while True:
            conn, addr = server.accept()
            thread = threading.Thread(target=handle_client, args=(conn, addr))
            thread.daemon = True
            thread.start()
    except KeyboardInterrupt:
        print("\n🛑 服务器关闭")
    finally:
        server.close()

# start_chat_server()

7. UDP 通信

# ---- UDP 服务端 ----
import socket

def udp_server(host="127.0.0.1", port=9998):
    server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  # DGRAM = UDP
    server.bind((host, port))
    print(f"🖥️ UDP 服务器启动: {host}:{port}")

    while True:
        data, addr = server.recvfrom(1024)
        message = data.decode("utf-8")
        print(f"📩 [{addr}] {message}")

        response = f"已收到: {message}"
        server.sendto(response.encode("utf-8"), addr)

# ---- UDP 客户端 ----
def udp_client(host="127.0.0.1", port=9998):
    client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    while True:
        message = input("📤 消息: ")
        if message == "quit":
            break

        client.sendto(message.encode("utf-8"), (host, port))
        data, addr = client.recvfrom(1024)
        print(f"📩 响应: {data.decode('utf-8')}")

    client.close()

💡 TCP vs UDP socket 区别:
• TCP: SOCK_STREAM,用 send/recv
• UDP: SOCK_DGRAM,用 sendto/recvfrom


8. socket 超时处理

import socket

def connect_with_timeout(host, port, timeout=5):
    """带超时的连接"""
    client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    client.settimeout(timeout)  # 设置超时时间

    try:
        client.connect((host, port))
        print(f"✅ 连接成功: {host}:{port}")
        return client
    except socket.timeout:
        print(f"⏰ 连接超时: {host}:{port}")
        client.close()
        return None
    except ConnectionRefusedError:
        print(f"❌ 连接被拒绝: {host}:{port}")
        client.close()
        return None

# 使用
conn = connect_with_timeout("127.0.0.1", 9999, timeout=3)
if conn:
    conn.send("Hello".encode())
    conn.settimeout(3)  # 接收也设超时
    try:
        data = conn.recv(1024)
        print(f"收到: {data.decode()}")
    except socket.timeout:
        print("⏰ 接收超时")
    conn.close()

9. 实战:文件传输

# ---- 文件传输服务端 ----
import socket
import os

def file_server(host="127.0.0.1", port=9997):
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server.bind((host, port))
    server.listen(1)
    print(f"📁 文件服务器启动: {host}:{port}")

    conn, addr = server.accept()
    print(f"✅ 客户端连接: {addr}")

    # 接收文件名和大小
    meta = conn.recv(1024).decode()
    filename, filesize = meta.split("|")
    filesize = int(filesize)

    print(f"📄 接收文件: {filename} ({filesize} bytes)")
    conn.send(b"READY")

    # 接收文件内容
    received = 0
    with open(f"received_{filename}", "wb") as f:
        while received < filesize:
            data = conn.recv(min(4096, filesize - received))
            if not data:
                break
            f.write(data)
            received += len(data)

    print(f"✅ 接收完成: {received} bytes")
    conn.close()
    server.close()

# ---- 文件传输客户端 ----
def file_client(filepath, host="127.0.0.1", port=9997):
    client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    client.connect((host, port))

    filename = os.path.basename(filepath)
    filesize = os.path.getsize(filepath)

    # 发送文件信息
    client.send(f"{filename}|{filesize}".encode())
    response = client.recv(1024)  # 等待 "READY"

    # 发送文件内容
    sent = 0
    with open(filepath, "rb") as f:
        while True:
            data = f.read(4096)
            if not data:
                break
            client.send(data)
            sent += len(data)

    print(f"✅ 发送完成: {sent} bytes")
    client.close()

10. 今日小结

概念
说明
关键代码
创建 socket
网络通信对象
socket(AF_INET, SOCK_STREAM)
绑定地址
IP + 端口
s.bind(("127.0.0.1", 9999))
监听
等待客户端连接
s.listen(5)
接受连接
三次握手
conn, addr = s.accept()
收发数据
字节流
send/recv
编码
str ↔ bytes
.encode() / .decode()

🎯 练习建议:
1. 给聊天室添加"私聊"功能(@用户名 消息)
2. 实现一个简易 FTP:客户端可以列出服务器上的文件、上传、下载
3. 用 UDP 实现一个简易 DNS 查询工具


📚 Day39 完成!明天学习 HTTP 协议 — 理解 Web 的基础

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  1. CONNECT:[ UseTime:0.000560s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000774s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002696s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000496s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000739s ]
  6. SELECT * FROM `set` [ RunTime:0.001544s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000771s ]
  8. SELECT * FROM `article` WHERE `id` = 500749 LIMIT 1 [ RunTime:0.007993s ]
  9. UPDATE `article` SET `lasttime` = 1783037600 WHERE `id` = 500749 [ RunTime:0.007595s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002849s ]
  11. SELECT * FROM `article` WHERE `id` < 500749 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001170s ]
  12. SELECT * FROM `article` WHERE `id` > 500749 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006519s ]
  13. SELECT * FROM `article` WHERE `id` < 500749 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015054s ]
  14. SELECT * FROM `article` WHERE `id` < 500749 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010454s ]
  15. SELECT * FROM `article` WHERE `id` < 500749 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008533s ]
0.165158s