<%@ page language="java" pageEncoding="UTF-8" %>
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<!DOCTYPE html>
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<html>
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<head>
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<title>Java后端WebSocket的Tomcat实现</title>
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</head>
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<body>
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Welcome<br/><input id="text" type="text"/>
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<button onclick="send()">发送消息</button>
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<hr/>
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<button onclick="closeWebSocket()">关闭WebSocket连接</button>
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<button onclick="openWebSocket()">开启WebSocket连接</button>
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<hr/>
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<div id="message"></div>
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</body>
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<script type="text/javascript">
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var ws = "ws://localhost:8080/gx_tieta/ws/websocket";
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var websocket = getWebSocket(ws);
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// 开启连接
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function openWebSocket() {
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websocket = getWebSocket(ws);
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}
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//关闭WebSocket连接
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function closeWebSocket() {
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websocket.close();
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}
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//发送消息
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function send() {
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var message = document.getElementById('text').value;
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websocket.send(message);
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}
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function getWebSocket(ws) {
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var websocket = null;
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//判断当前浏览器是否支持WebSocket
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if ('WebSocket' in window) {
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websocket = new WebSocket(ws);
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}
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else {
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alert('当前浏览器 Not support websocket')
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}
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//连接发生错误的回调方法
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websocket.onerror = function () {
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setMessageInnerHTML("WebSocket连接发生错误");
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};
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//连接成功建立的回调方法
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websocket.onopen = function () {
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setMessageInnerHTML("WebSocket连接成功");
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}
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//接收到消息的回调方法
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websocket.onmessage = function (event) {
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setMessageInnerHTML(event.data);
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}
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//连接关闭的回调方法
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websocket.onclose = function () {
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setMessageInnerHTML("WebSocket连接关闭");
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}
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//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
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window.onbeforeunload = function () {
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closeWebSocket();
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}
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//将消息显示在网页上
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function setMessageInnerHTML(innerHTML) {
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document.getElementById('message').innerHTML += innerHTML + '<br/>';
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}
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return websocket;
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}
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</script>
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</html>
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