Websocket
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小牛编辑
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2023-12-01
Jboot 内置了 Undertow 服务器,完美支持 websocket 功能, tomcat8 也是内置了对 websocket 的支持。
在使用 websocket 之前,需要添加如下配置:
jboot.web.webSocketEndpoint=your-endpoint-class-name
例如:
//多个 endpoint 用英文逗号(,) 隔开。
jboot.web.webSocketEndpoint=io.jboot.test.websocket.WebsocketDemo
WebsocketDemo 的代码如下:
package io.jboot.test.websocket;
import javax.websocket.OnMessage;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
@ServerEndpoint("/myapp.ws")
public class WebsocketDemo {
@OnMessage
public void message(String message, Session session) {
for (Session s : session.getOpenSessions()) {
System.out.println("receive : " + message);
s.getAsyncRemote().sendText(message);
}
}
}
这里要注意:@ServerEndpoint("/myapp.ws")
中的内容 /myapp.ws
必须有后缀,后缀可以自定义,否则会被 JFinal 的拦截。
我们还需要写一个 Controller,来渲染 html 页面。
@RequestMapping("/websocket")
public class WebsocketController extends JbootController {
public void index() {
render("/websocket.html");
}
}
websocket.html 的内容如下:
<html>
<head><title>Undertow Chat</title>
<script>
var socket;
if (window.WebSocket) {
// 这里的 /myapp.ws 必须和以上 @ServerEndpoint("/myapp.ws")
// 中配置的内容保持一致
socket = new WebSocket("ws://127.0.0.1:8080/myapp.ws");
socket.onmessage = function (event) {
var chat = document.getElementById('chat');
chat.innerHTML = chat.innerHTML + event.data + "<br />";
};
} else {
alert("Your browser does not support Websockets. (Use Chrome)");
}
function send(message) {
if (!window.WebSocket) {
return false;
}
if (socket.readyState == WebSocket.OPEN) {
socket.send(message);
} else {
alert("The socket is not open.");
}
return false;
}
</script>
<style type="text/css">
html,body {width:100%;height:100%;}
html,body,ul,ol,dl,li,dt,dd,p,blockquote,fieldset,legend,img,form,h1,h2,h3,h4,h5,h6 {margin:0;padding:0;}
body {
font:normal 12px/1.5 Arial,Helvetica,'Bitstream Vera Sans',sans-serif;
background: #c5deea; /* Old browsers */
background: -moz-linear-gradient(top, #c5deea 0%, #066dab 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #c5deea), color-stop(100%, #066dab)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #c5deea 0%, #066dab 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #c5deea 0%, #066dab 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #c5deea 0%, #066dab 100%); /* IE10+ */
background: linear-gradient(to bottom, #c5deea 0%, #066dab 100%); /* W3C */
height: 90%;
}
.center {
margin-left: auto;
margin-right: auto;
width: 70%;
background: white;
}
.chatform {
margin-left: auto;
margin-right: auto;
margin-bottom: 0;
width: 70%;
}
form{
width: 100%;
}
label{
display: inline;
width: 100px;
}
#msg{
display: inline;
width: 100%;
}
</style>
</head>
<body>
<div class="page">
<div class="center" >
<h1>JSR-356 Web Socket Chat</h1>
<div id="chat" style="height:100%;width: 100%; overflow: scroll;">
</div>
<form onsubmit="return false;" class="chatform" action="">
<label for="msg">Message</label>
<input type="text" name="message" id="msg"
onkeypress="if(event.keyCode==13) { send(this.form.message.value); this.value='' } " />
</form>
</div>
</div>
</body>
</html>