🗺\ufe0f \u4e8c\u3001 \u5efa\u7acb\u7f51\u7edc\u7f16\u7a0b\u7684\u201c\u5730\u56fe\u201d<\/h5>\n
\u5728\u5199\u4ee3\u7801\u524d，\u6211\u4eec\u9700\u8981\u7406\u89e3\u51e0\u4e2a\u57fa\u7840\u6a21\u578b：<\/p>\n
1. \u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u6a21\u578b<\/p>\n
- \n
- \u670d\u52a1\u7aef：\u7ed1\u5b9a IP \u548c\u7aef\u53e3 \u2192 \u76d1\u542c \u2192 \u63a5\u6536\u8fde\u63a5 \u2192 \u5904\u7406\u4e1a\u52a1 \u2192 \u8fd4\u56de\u7ed3\u679c\u3002<\/li>\n
- \u5ba2\u6237\u7aef：\u77e5\u9053\u670d\u52a1\u7aef\u5730\u5740 \u2192 \u53d1\u8d77\u8fde\u63a5 \u2192 \u53d1\u9001\u8bf7\u6c42 \u2192 \u63a5\u6536\u54cd\u5e94\u3002<\/li>\n<\/ul>\n
2. TCP \u4e0e UDP \u7684\u6289\u62e9<\/p>\n
\u8868\u683c<\/p>\n
\u4e0b\u8f7d\u4e3a\u8868\u683c<\/p>\n
\u5bfc\u51fa\u4e3a\u56fe\u7247<\/p>\n
\n
\u7279\u6027TCPUDP<\/tr>\n \n\n \u8fde\u63a5\u6027<\/td>\n \u9762\u5411\u8fde\u63a5（\u9700\u4e09\u6b21\u63e1\u624b）<\/td>\n \u65e0\u8fde\u63a5<\/td>\n<\/tr>\n \n \u53ef\u9760\u6027<\/td>\n \u53ef\u9760\u3001\u6709\u5e8f\u3001\u4e0d\u4e22\u5931<\/td>\n \u4e0d\u53ef\u9760\u3001\u53ef\u80fd\u4e22\u5305\u3001\u4e71\u5e8f<\/td>\n<\/tr>\n \n \u6570\u636e\u5f62\u5f0f<\/td>\n \u5b57\u8282\u6d41（\u65e0\u8fb9\u754c）<\/td>\n \u6570\u636e\u62a5（\u6709\u8fb9\u754c）<\/td>\n<\/tr>\n \n \u5178\u578b\u573a\u666f<\/td>\n HTTP\u3001\u6587\u4ef6\u4f20\u8f93\u3001\u804a\u5929<\/td>\n \u89c6\u9891\u76f4\u64ad\u3001DNS\u3001\u8bed\u97f3\u901a\u8bdd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n 3. Socket \u662f\u4ec0\u4e48？
\nSocket \u662f\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\u7f51\u7edc\u901a\u4fe1\u63a5\u53e3\u3002\u5728 Python \u4e2d，socket\u00a0\u5bf9\u8c61\u8d1f\u8d23\u5efa\u7acb\u8fde\u63a5\u3001\u6536\u53d1\u6570\u636e\u548c\u5173\u95ed\u8fde\u63a5\u3002<\/p>\npython<\/p>\n
\u7f16\u8f91<\/p>\n
1import socket
\n2
\n3# \u521b\u5efa IPv4 TCP Socket
\n4sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)<\/p>\n🛠\ufe0f \u4e09\u3001 \u5b9e\u6218：\u5199\u51fa\u7b2c\u4e00\u4e2a TCP \u670d\u52a1\u7aef<\/h5>\n
\u8fd9\u662f\u6700\u7ecf\u5178\u7684\u201c\u56de\u663e\u670d\u52a1\u201d（Echo Server）：\u5ba2\u6237\u7aef\u53d1\u4ec0\u4e48，\u670d\u52a1\u7aef\u56de\u4ec0\u4e48\u3002<\/p>\n
1. \u670d\u52a1\u7aef\u4ee3\u7801 (tcp_server.py)<\/p>\n
python<\/p>\n
\u7f16\u8f91<\/p>\n
1import socket
\n2
\n3HOST = "127.0.0.1"
\n4PORT = 5000
\n5BUFFER_SIZE = 4096
\n6
\n7def main():
\n8 # \u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668，\u81ea\u52a8\u5173\u95ed\u8d44\u6e90
\n9 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as server:
\n10 # \u5141\u8bb8\u7aef\u53e3\u91cd\u7528，\u9632\u6b62\u91cd\u542f\u62a5\u9519 Address already in use
\n11 server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
\n12
\n13 server.bind((HOST, PORT))
\n14 server.listen()
\n15 print(f"\u670d\u52a1\u7aef\u5df2\u542f\u52a8：{HOST}:{PORT}")
\n16
\n17 # \u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5
\n18 conn, address = server.accept()
\n19 with conn:
\n20 print(f"\u5ba2\u6237\u7aef\u5df2\u8fde\u63a5：{address}")
\n21 while True:
\n22 data = conn.recv(BUFFER_SIZE)
\n23 if not data: # \u5ba2\u6237\u7aef\u65ad\u5f00
\n24 break
\n25 print(f"\u6536\u5230：{data!r}")
\n26 conn.sendall(data) # \u539f\u6837\u53d1\u56de
\n27
\n28if __name__ == "__main__":
\n29 main()<\/p>\n2. \u5ba2\u6237\u7aef\u4ee3\u7801 (tcp_client.py)<\/p>\n
python<\/p>\n
\u7f16\u8f91<\/p>\n
1import socket
\n2
\n3def main():
\n4 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as client:
\n5 client.connect(("127.0.0.1", 5000))
\n6 message = "\u4f60\u597d，Python \u7f51\u7edc\u7f16\u7a0b！"
\n7 client.sendall(message.encode("utf-8"))
\n8
\n9 response = client.recv(4096)
\n10 print("\u670d\u52a1\u7aef\u8fd4\u56de：", response.decode("utf-8"))
\n11
\n12if __name__ == "__main__":
\n13 main()<\/p>\n\u5173\u952e\u70b9\u89e3\u6790：<\/p>\n
- \n
- with socket.socket(…)：\u63a8\u8350\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668，\u786e\u4fdd\u5f02\u5e38\u65f6\u4e5f\u80fd\u81ea\u52a8\u5173\u95ed Socket\u3002<\/li>\n
- send()\u00a0vs\u00a0sendall()：send\u00a0\u53ef\u80fd\u53ea\u53d1\u9001\u4e86\u90e8\u5206\u6570\u636e，sendall\u00a0\u4f1a\u786e\u4fdd\u6570\u636e\u5168\u90e8\u5199\u5165\u7f13\u51b2\u533a，\u4e1a\u52a1\u4ee3\u7801\u4f18\u5148\u7528\u00a0sendall\u3002<\/li>\n<\/ul>\n
\u26a0\ufe0f \u56db\u3001 \u907f\u5751\u6307\u5357：TCP \u7684\u201c\u7c98\u5305\u201d\u4e0e\u6d88\u606f\u8fb9\u754c<\/h5>\n
TCP \u662f\u6ca1\u6709\u6d88\u606f\u8fb9\u754c\u7684\u5b57\u8282\u6d41\u3002
\n\u5ba2\u6237\u7aef\u00a0send\u00a0\u4e24\u6b21 "Hello" \u548c "World"，\u670d\u52a1\u7aef\u00a0recv\u00a0\u53ef\u80fd\u4f1a\u4e00\u6b21\u6027\u6536\u5230 "HelloWorld"，\u4e5f\u53ef\u80fd\u5206\u4e09\u6b21\u6536\u5230 "Hel", "loW", "orld"\u3002<\/p>\n\u89e3\u51b3\u65b9\u6848：\u5b9a\u4e49\u5e94\u7528\u5c42\u534f\u8bae
\n\u6700\u5e38\u7528\u7684\u662f\u00a0\u957f\u5ea6\u524d\u7f00\u534f\u8bae：\u5148\u53d1 4 \u4e2a\u5b57\u8282\u8868\u793a\u957f\u5ea6，\u518d\u53d1\u5177\u4f53\u5185\u5bb9\u3002<\/p>\n\u901a\u7528\u534f\u8bae\u5de5\u5177 (protocol.py)<\/p>\n
python<\/p>\n
\u7f16\u8f91<\/p>\n
1import socket
\n2import struct
\n3
\n4HEADER_SIZE = 4
\n5
\n6def recv_exact(sock, size):
\n7 """\u786e\u4fdd\u8bfb\u53d6\u6307\u5b9a\u957f\u5ea6\u7684\u5b57\u8282"""
\n8 chunks = []
\n9 remaining = size
\n10 while remaining > 0:
\n11 chunk = sock.recv(remaining)
\n12 if not chunk:
\n13 raise ConnectionError("\u8fde\u63a5\u5173\u95ed")
\n14 chunks.append(chunk)
\n15 remaining -= len(chunk)
\n16 return b"".join(chunks)
\n17
\n18def send_message(sock, payload):
\n19 """\u53d1\u9001：4\u5b57\u8282\u957f\u5ea6 + \u5185\u5bb9"""
\n20 header = struct.pack("!I", len(payload)) # !I \u8868\u793a\u7f51\u7edc\u5b57\u8282\u5e8f\u65e0\u7b26\u53f7\u6574\u6570
\n21 sock.sendall(header + payload)
\n22
\n23def recv_message(sock):
\n24 """\u63a5\u6536：\u5148\u8bfb\u957f\u5ea6，\u518d\u8bfb\u5185\u5bb9"""
\n25 header = recv_exact(sock, HEADER_SIZE)
\n26 (msg_len,) = struct.unpack("!I", header)
\n27 return recv_exact(sock, msg_len)<\/p>\n🚀 \u4e94\u3001 \u8fdb\u9636：\u5e76\u53d1\u6a21\u578b\u7684\u9009\u62e9<\/h5>\n
\u5355\u7ebf\u7a0b\u670d\u52a1\u7aef\u4e00\u6b21\u53ea\u80fd\u670d\u52a1\u4e00\u4e2a\u5ba2\u6237\u7aef\u3002\u5982\u4f55\u89e3\u51b3\u9ad8\u5e76\u53d1？<\/p>\n
1. \u591a\u7ebf\u7a0b\u6a21\u578b (Threading)
\n\u9002\u5408\u8fde\u63a5\u6570\u51e0\u767e\u5230\u51e0\u5343，\u903b\u8f91\u7b80\u5355\u7684\u573a\u666f\u3002<\/p>\npython<\/p>\n
\u7f16\u8f91<\/p>\n
1from concurrent.futures import ThreadPoolExecutor
\n2
\n3# \u5728\u7ebf\u7a0b\u6c60\u4e2d\u5904\u7406\u8fde\u63a5
\n4with ThreadPoolExecutor(max_workers=20) as pool:
\n5 while True:
\n6 conn, addr = server.accept()
\n7 pool.submit(handle_client, conn, addr) # \u63d0\u4ea4\u4efb\u52a1<\/p>\n2. I\/O \u591a\u8def\u590d\u7528 (selectors)
\n\u8fd9\u662f\u9ad8\u6027\u80fd\u7f51\u7edc\u5e93\u7684\u5e95\u5c42\u539f\u7406\u3002\u4e00\u4e2a\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u8fde\u63a5，\u64cd\u4f5c\u7cfb\u7edf\u544a\u8bc9\u7a0b\u5e8f\u201c\u54ea\u4e2a Socket \u53ef\u8bfb\/\u53ef\u5199\u201d\u3002<\/p>\n3. \u5f02\u6b65 I\/O (asyncio)
\nPython \u5b98\u65b9\u63a8\u8350\u7684\u73b0\u4ee3\u9ad8\u5e76\u53d1\u65b9\u6848\u3002\u57fa\u4e8e\u534f\u7a0b，\u5355\u7ebf\u7a0b\u5373\u53ef\u5904\u7406\u6570\u4e07\u8fde\u63a5\u3002<\/p>\nAsyncio \u670d\u52a1\u7aef\u793a\u4f8b：<\/p>\n
python<\/p>\n
\u7f16\u8f91<\/p>\n
1import asyncio
\n2
\n3async def handle_client(reader, writer):
\n4 peer = writer.get_extra_info("peername")
\n5 print(f"\u8fde\u63a5：{peer}")
\n6 try:
\n7 while True:
\n8 # \u8bfb\u53d6\u4e00\u884c\u6570\u636e（\u81ea\u52a8\u5904\u7406\u8fb9\u754c）
\n9 data = await reader.readline()
\n10 if not data: break
\n11
\n12 # \u4e1a\u52a1\u903b\u8f91
\n13 writer.write(b"echo: " + data)
\n14 await writer.drain() # \u91cd\u8981：\u80cc\u538b\u63a7\u5236，\u9632\u6b62\u5185\u5b58\u6ea2\u51fa
\n15 except Exception as e:
\n16 print(e)
\n17 finally:
\n18 writer.close()
\n19 await writer.wait_closed()
\n20
\n21async def main():
\n22 server = await asyncio.start_server(handle_client, '127.0.0.1', 5005)
\n23 async with server:
\n24 await server.serve_forever()
\n25
\n26if __name__ == "__main__":
\n27 asyncio.run(main())<\/p>\n\u6ce8\u610f：\u00a0await writer.drain()\u00a0\u975e\u5e38\u91cd\u8981，\u5b83\u5b9e\u73b0\u4e86\u80cc\u538b（Backpressure），\u5f53\u53d1\u9001\u7f13\u51b2\u533a\u6ee1\u65f6\u6682\u505c\u534f\u7a0b，\u9632\u6b62\u5185\u5b58\u66b4\u6da8\u3002<\/p>\n
🏆 \u516d\u3001 \u7ec8\u6781\u5b9e\u6218：\u5f02\u6b65\u591a\u4eba\u804a\u5929\u5ba4<\/h5>\n
\u7ed3\u5408\u4e0a\u8ff0\u77e5\u8bc6，\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u652f\u6301\u591a\u4eba\u7684\u804a\u5929\u5ba4\u3002<\/p>\n
\u6838\u5fc3\u903b\u8f91 (chat_server.py)：<\/p>\n
- \u7ef4\u62a4\u4e00\u4e2a\u5168\u5c40\u7684\u00a0clients\u00a0\u5b57\u5178，\u5b58\u50a8\u6240\u6709\u6d3b\u8dc3\u7684 writer\u3002<\/li>\n
- \u6536\u5230\u6d88\u606f\u540e，\u904d\u5386\u00a0clients\u00a0\u5e7f\u64ad\u7ed9\u6240\u6709\u4eba\u3002<\/li>\n
- \u5904\u7406\u7528\u6237\u4e0a\u4e0b\u7ebf\u901a\u77e5\u3002<\/li>\n
python<\/p>\n
\u7f16\u8f91<\/p>\n
1import asyncio
\n2
\n3clients = {} # \u5b58\u50a8 {writer: username}
\n4
\n5async def broadcast(message, exclude=None):
\n6 """\u5e7f\u64ad\u6d88\u606f\u7ed9\u6240\u6709\u5ba2\u6237\u7aef"""
\n7 dead_clients = []
\n8 for writer in clients:
\n9 if writer is exclude: continue
\n10 try:
\n11 writer.write(message.encode('utf-8') + b'\\\\n')
\n12 await writer.drain()
\n13 except ConnectionError:
\n14 dead_clients.append(writer)
\n15
\n16 # \u6e05\u7406\u5931\u6548\u8fde\u63a5
\n17 for writer in dead_clients:
\n18 clients.pop(writer, None)
\n19 writer.close()
\n20
\n21async def handle_client(reader, writer):
\n22 # 1. \u83b7\u53d6\u7528\u6237\u540d
\n23 await send_line(writer, "\u8bf7\u8f93\u5165\u7528\u6237\u540d：")
\n24 raw_name = await reader.readline()
\n25 username = raw_name.decode().strip()
\n26 clients[writer] = username
\n27
\n28 await broadcast(f"[\u7cfb\u7edf] {username} \u52a0\u5165\u804a\u5929\u5ba4")
\n29
\n30 # 2. \u5faa\u73af\u63a5\u6536\u6d88\u606f
\n31 try:
\n32 while True:
\n33 raw = await reader.readline()
\n34 if not raw: break
\n35 msg = raw.decode().strip()
\n36 if msg == '\/quit': break
\n37 await broadcast(f"[{username}] {msg}")
\n38 finally:
\n39 # 3. \u6e05\u7406\u8d44\u6e90
\n40 if writer in clients:
\n41 clients.pop(writer)
\n42 await broadcast(f"[\u7cfb\u7edf] {username} \u79bb\u5f00")
\n43 writer.close()
\n44 await writer.wait_closed()
\n45
\n46async def send_line(writer, msg):
\n47 writer.write(msg.encode('utf-8') + b'\\\\n')
\n48 await writer.drain()
\n49
\n50# \u542f\u52a8\u670d\u52a1
\n51asyncio.run(asyncio.start_server(handle_client, '127.0.0.1', 6000).serve_forever())<\/p>\n🛡\ufe0f \u4e03\u3001 \u751f\u4ea7\u73af\u5883\u6ce8\u610f\u4e8b\u9879<\/h5>\n
\u4ece\u201c\u80fd\u8dd1\u201d\u5230\u201c\u4e0a\u7ebf\u201d，\u4f60\u8fd8\u9700\u8981\u8003\u8651：<\/p>\n
- \u8d85\u65f6\u8bbe\u7f6e：\u5fc5\u987b\u8bbe\u7f6e\u00a0timeout，\u9632\u6b62\u8fde\u63a5\u50f5\u6b7b\u3002<\/li>\n
- \u5f02\u5e38\u5904\u7406：ConnectionResetError\u3001BrokenPipeError\u00a0\u662f\u5bb6\u5e38\u4fbf\u996d，\u8981\u4f18\u96c5\u6355\u83b7\u3002<\/li>\n
- \u5b89\u5168\u6027：\n
- \n
- \u9650\u5236\u6d88\u606f\u6700\u5927\u957f\u5ea6，\u9632\u6b62\u5185\u5b58\u6ea2\u51fa\u653b\u51fb\u3002<\/li>\n
- \u4e0d\u8981\u76f4\u63a5\u00a0pickle.loads\u00a0\u4e0d\u53ef\u4fe1\u6570\u636e\u3002<\/li>\n
- \u751f\u4ea7\u73af\u5883\u52a1\u5fc5\u4f7f\u7528 TLS\/SSL \u52a0\u5bc6\u3002<\/li>\n<\/ul>\n<\/li>\n
- \u5fc3\u8df3\u673a\u5236：\u957f\u8fde\u63a5\u9700\u8981\u5fc3\u8df3\u5305（Ping\/Pong）\u6765\u68c0\u6d4b\u8fde\u63a5\u662f\u5426\u5b58\u6d3b\u3002
\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260813094048-6a7d9120cba8a.png\")
<\/li>\n📌 \u603b\u7ed3<\/h5>\n
Python \u7f51\u7edc\u7f16\u7a0b\u7684\u5b66\u4e60\u8def\u5f84：<\/p>\n
- \u5165\u95e8：\u638c\u63e1\u00a0socket\u00a0\u963b\u585e\u5f0f\u7f16\u7a0b，\u7406\u89e3 TCP \u4e09\u6b21\u63e1\u624b\u4e0e\u56db\u6b21\u6325\u624b\u3002<\/li>\n
- \u8fdb\u9636：\u7406\u89e3\u201c\u7c98\u5305\u201d\u95ee\u9898，\u5b66\u4f1a\u8bbe\u8ba1\u957f\u5ea6\u524d\u7f00\u534f\u8bae\u3002<\/li>\n
- \u9ad8\u5e76\u53d1：\u4ece\u591a\u7ebf\u7a0b\u8f6c\u5411\u00a0asyncio，\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\u4e0e\u534f\u7a0b\u3002<\/li>\n
- \u5de5\u7a0b\u5316：\u52a0\u5165\u8d85\u65f6\u3001\u91cd\u8bd5\u3001\u5fc3\u8df3\u3001\u65e5\u5fd7\u4e0e\u76d1\u63a7\u3002<\/li>\n","protected":false},"excerpt":{"rendered":"
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