• WebSocket

    HTTP的生命周期通过 Request 来界定，也就是一个 Request 一个 Response ，那么在 HTTP1.0 中，这次HTTP请求就结束了。

    在HTTP1.1中进行了改进，使得有一个keep-alive，也就是说，在一个HTTP连接中，可以发送多个Request，接收多个Response。但是请记住 Request = Response， 在HTTP中永远是这样，也就是说一个request只能有一个response。而且这个response也是被动的，不能主动发起。

    import json

from flask import Flask,request,render_template

from geventwebsocket.handler import WebSocketHandler
from gevent.pywsgi import WSGIServer
from geventwebsocket.websocket import WebSocket

app = Flask(__name__)

user_socket_dict = {}

@app.route("/conn_ws/<user_nick>")
def ws_app(user_nick):

    user_socket = request.environ.get("wsgi.websocket")  # type:WebSocket 会有提示语句
    user_socket_dict[user_nick] = user_socket
    print(len(user_socket_dict),list(user_socket_dict.keys()))

    while True:
        msg = user_socket.receive()  #接受消息
        msg_dict = json.loads(msg)
        to_user = msg_dict.get("to_user")
        to_user_socket = user_socket_dict.get(to_user)
        to_user_socket.send(msg) #回复消息


@app.route("/")
def index():
    return render_template("my_ws.html")


if __name__ == '__main__':
    # app.run()
    http_serv = WSGIServer(("0.0.0.0",9527),app,handler_class=WebSocketHandler) #设置websocket
    http_serv.serve_forever() #启动websocket

    单聊

    import json

from flask import Flask,request,render_template

from geventwebsocket.handler import WebSocketHandler
from gevent.pywsgi import WSGIServer
from geventwebsocket.websocket import WebSocket

app = Flask(__name__)

user_socket_dict = {}

@app.route("/conn_ws/<user_nick>")
def ws_app(user_nick):

    user_socket = request.environ.get("wsgi.websocket")  # type:WebSocket
    user_socket_dict[user_nick] = user_socket
    print(len(user_socket_dict),list(user_socket_dict.keys()))

    while True:
        msg = user_socket.receive()
        msg_dict = json.loads(msg)
        to_user = msg_dict.get("to_user")
        to_user_socket = user_socket_dict.get(to_user)
        to_user_socket.send(msg)


@app.route("/")
def index():
    return render_template("my_ws.html")


if __name__ == '__main__':
    # app.run()
    http_serv = WSGIServer(("0.0.0.0",9527),app,handler_class=WebSocketHandler)
    http_serv.serve_forever()
    py
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<p><input type="text" id="nick"><button onclick="login()">登陆聊天室</button></p>
发送给：<input type="text" id="to_user">消息：<input type="text" id="send_str">
<button id="send_btn" onclick="send()">发送消息</button>
<p>
<div id="chat_list">

</div>
</p>
</body>
<script type="application/javascript">
    var ws = null;
    // ws.onopen = function(){
    //     ws.send("123");
    // }

    function login() {
        var nick = document.getElementById("nick").value;
        ws = new WebSocket("ws://192.168.11.133:9527/conn_ws/"+nick);
        ws.onmessage = function (messageEvent) {
            console.log(messageEvent.data);
            var ptag = document.createElement("p");

            var message = JSON.parse(messageEvent.data);

            ptag.innerText =message.from_user + " : " + message.message ;
            document.getElementById("chat_list").appendChild(ptag);
        };
    }

    // document.getElementById("send_btn").addEventListener("onclick",)
    function send() {
        var message = document.getElementById("send_str").value;
        var send_str = {
            from_user:document.getElementById("nick").value,
            to_user:document.getElementById("to_user").value,
            message:message
        };
        var json_send_str = JSON.stringify(send_str);
        ws.send(json_send_str);
    }
</script>
</html>
    html

    群聊

    from flask import Flask,request,render_template

from geventwebsocket.handler import WebSocketHandler
from gevent.pywsgi import WSGIServer
from geventwebsocket.websocket import WebSocket

app = Flask(__name__)

user_socket_list = []

@app.route("/conn_ws")
def ws_app():

    user_socket = request.environ.get("wsgi.websocket")  # type:WebSocket
    user_socket_list.append(user_socket)
    print(len(user_socket_list),user_socket_list)

    while True:
        msg = user_socket.receive()
        print(msg)

        for usocket in  user_socket_list:
            usocket.send(msg)

    


@app.route("/")
def index():
    return render_template("my_ws.html")


if __name__ == '__main__':
    # app.run()
    http_serv = WSGIServer(("0.0.0.0",9527),app,handler_class=WebSocketHandler)
    http_serv.serve_forever()
    .py
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<input type="text" id="send_str">
<button id="send_btn" onclick="send()">发送消息</button>
<p>
<div id="chat_list">

</div>
</p>
</body>
<script type="application/javascript">
    var ws = new WebSocket("ws://192.168.11.133:9527/conn_ws");
    ws.onmessage = function (messageEvent) {
        console.log(messageEvent.data);
        var ptag = document.createElement("p");
        ptag.innerText = messageEvent.data;
        document.getElementById("chat_list").appendChild(ptag);
    };

    // document.getElementById("send_btn").addEventListener("onclick",)
    function send() {
        var send_str = document.getElementById("send_str").value;
        ws.send(send_str);
    }
</script>
</html>
    html
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  • 原文地址：https://www.cnblogs.com/wanglan/p/10581333.html
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