python開發(fā)實例之python使用Websocket庫開發(fā)簡單聊天工具實例詳解(python+Websocket+JS)

更新時間：2020年03月18日 15:16:56 作者：沙振宇

這篇文章主要介紹了python開發(fā)實例之python使用Websocket庫開發(fā)簡單聊天工具實例詳解(python+Websocket+JS),需要的朋友可以參考下

最近又回顧了下Websocket，發(fā)現(xiàn)已經(jīng)忘的七七八八了。于是用js寫了客戶端，用python寫了服務端，來復習一下這方面的知識。

先看一下python簡單聊天工具最終效果

一個客戶端連上服務的并發(fā)送消息

另一個客戶端連上服務的并發(fā)送消息

服務的收到客戶端的全部消息并返回消息

一個客戶端掉線并不影響其它socket連接

列取全部連接客戶端對象和當前發(fā)消息的客戶端對象

先安裝websockets

pip install websockets

python簡單聊天工具實例源碼

Python聊天工具服務端

#! -*- coding: utf-8 -*-
"""
Info: Websocket 的使用示例
"""
import asyncio
import websockets

websocket_users = set()


# 檢測客戶端權(quán)限，用戶名密碼通過才能退出循環(huán)
async def check_user_permit(websocket):
  print("new websocket_users:", websocket)
  websocket_users.add(websocket)
  print("websocket_users list:", websocket_users)
  while True:
    recv_str = await websocket.recv()
    cred_dict = recv_str.split(":")
    if cred_dict[0] == "admin" and cred_dict[1] == "123456":
      response_str = "Congratulation, you have connect with server..."
      await websocket.send(response_str)
      print("Password is ok...")
      return True
    else:
      response_str = "Sorry, please input the username or password..."
      print("Password is wrong...")
      await websocket.send(response_str)


# 接收客戶端消息并處理，這里只是簡單把客戶端發(fā)來的返回回去
async def recv_user_msg(websocket):
  while True:
    recv_text = await websocket.recv()
    print("recv_text:", websocket.pong, recv_text)
    response_text = f"Server return: {recv_text}"
    print("response_text:", response_text)
    await websocket.send(response_text)


# 服務器端主邏輯
async def run(websocket, path):
  while True:
    try:
      await check_user_permit(websocket)
      await recv_user_msg(websocket)
    except websockets.ConnectionClosed:
      print("ConnectionClosed...", path)  # 鏈接斷開
      print("websocket_users old:", websocket_users)
      websocket_users.remove(websocket)
      print("websocket_users new:", websocket_users)
      break
    except websockets.InvalidState:
      print("InvalidState...")  # 無效狀態(tài)
      break
    except Exception as e:
      print("Exception:", e)


if __name__ == '__main__':
  print("127.0.0.1:8181 websocket...")
  asyncio.get_event_loop().run_until_complete(websockets.serve(run, "127.0.0.1", 8181))
  asyncio.get_event_loop().run_forever()

python簡單聊天工具客戶端代碼Html+Js

<!-- Websocket 的使用示例 -->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>測試Socket——ws://127.0.0.1:8181</title>
  <script>
    var socket;
    if ("WebSocket" in window) {
      var ws = new WebSocket("ws://127.0.0.1:8181/test");
      socket = ws;
      ws.onopen = function() {
        console.log('連接成功');
        alert("連接成功, 請輸入賬號和密碼");
      };
      ws.onmessage = function(evt) {
        var received_msg = evt.data;
        document.getElementById("showMes").value+=received_msg+"\n";
      };
      ws.onclose = function() {
        alert("斷開了連接");
      };
    } else {
      alert("瀏覽器不支持WebSocket");
    }
    function sendMeg(){
      var message=document.getElementById("name").value+":"+document.getElementById("mes").value;
      document.getElementById("showMes").value+=message+"\n\n";
      socket.send(message);
    }
  </script>
</head>
<body>
  <textarea rows="3" cols="30" id="showMes" style="width:300px;height:500px;"></textarea>
  <br/>
  <label>名稱</label>
  <input type="text" id="name"/>
  <br/>
  <label>消息</label>
  <input type="text" id="mes"/>
  <button onclick="sendMeg();">發(fā)送</button>
</body>
</html>

本文主要介紹了python使用Websocket庫開發(fā)簡單聊天工具實例詳細，更多關(guān)于python Websocket庫開發(fā)知識請查看下面的相關(guān)鏈接

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