獲取http會(huì)話用途

未使用前后端分離開發(fā)方案下，在WebSocketSession中如果能拿到HttpSession會(huì)話信息，就可以根據(jù)會(huì)話中的屬性值，做相應(yīng)的業(yè)務(wù)邏輯處理，比如權(quán)限控制，用戶身份識(shí)別，信息過濾等等

SpringBoot版本 2.4.5

使用方式

修改registerWebSocketHandlers配置，增加HttpSessionHandshakeInterceptor攔截器，用于實(shí)現(xiàn)同步HttpSession會(huì)話中的屬性信息
修改WebSocketHandler消息處理器，嘗試打印WebSocketSession中的會(huì)話信息，來觀察http會(huì)話信息是否已經(jīng)同步過來~

3.添加設(shè)置http會(huì)話信息的Controller層映射方法

4.編寫前端測(cè)試代碼來設(shè)置HttpSession會(huì)話信息，以及連接websocket服務(wù)
完整代碼參考：https://github.com/netbuffer/spring-boot-websocket-demo/blob/master/src/main/resources/public/websocket.html

    <script src="/reconnecting-websocket.js"></script>
    <script type="text/javascript">
        var ws = new ReconnectingWebSocket("ws://localhost:17000/ws", null, {
            debug: true,
            automaticOpen: false,
            reconnectInterval: 3000
        });

        ws.onopen = function () {
            console.log("Connection open ...");
        }

        ws.onmessage = function (r) {
            console.log("Received Message: " + r.data);
        }

        ws.onclose = function () {
            console.log("Connection closed.");
        }

        function connect() {
            ws.open();
        }

        function set_session() {
            var key = prompt("請(qǐng)輸入key");
            var value = prompt("請(qǐng)輸入value");
            var formData = new FormData();
            formData.append('key', key);
            formData.append('value', value);
            fetch("/http/session/set", {
                body: formData,
                method: 'POST'
            })
                .then(function (response) {
                    return response;
                })
                .then(function (response) {
                    console.log(`send msg success`);
                    alert("send success");
                });
        }
    </script>
</head>
<body>
<div>
    <button onclick="connect()">connect</button>
    <button onclick="set_session()">set_session</button>
</div>