java websocket

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 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>   <!DOCTYPE HTML> <html>   <head>     <base href="<%=basePath%>">     <title>My WebSocket</title>   </head>       <body>     Welcome<br/>     <input id="text" type="text" /><button onclick="send()">Send</button>    <button onclick="closeWebSocket()">Close</button>     <div id="message">     </div>   </body>       <script type="text/javascript">       var websocket = null;               //判断当前浏览器是否支持WebSocket       if('WebSocket' in window){           websocket = new WebSocket("ws://localhost:8888/testWebsocket/websocket");       }       else{           alert('Not support websocket');       }               //连接发生错误的回调方法       websocket.onerror = function(){           setMessageInnerHTML("error");       };               //连接成功建立的回调方法       websocket.onopen = function(event){           setMessageInnerHTML("open");       }               //接收到消息的回调方法       websocket.onmessage = function(){           setMessageInnerHTML(event.data);       }               //连接关闭的回调方法       websocket.onclose = function(){           setMessageInnerHTML("close");       }               //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。       window.onbeforeunload = function(){           websocket.close();       }               //将消息显示在网页上       function setMessageInnerHTML(innerHTML){           document.getElementById('message').innerHTML += innerHTML + '<br/>';       }               //关闭连接       function closeWebSocket(){           websocket.close();       }               //发送消息       function send(){           var message = document.getElementById('text').value;           websocket.send(message);       }   </script> </html>
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