说明以tomcat容器为例，tomcat7以上版本开始支持websocket,JFinal集成的jetty服务器不支持websocket
一、包依赖，tomcat7或是javaee包都行，两者二选一，容器中已提供所以只作为提供者
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-websocket-api</artifactId>
<version>7.0.47</version>
<scope>provided</scope>
</dependency><dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>二、JFinal的配置，需要一个Handler拦截websocket请求，WebSocketHandler实现如下
package com.nmtx.manager.handler;import java.util.regex.Pattern;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.jfinal.handler.Handler;
import com.jfinal.kit.StrKit;public class WebSocketHandler extends Handler{private Pattern filterUrlRegxPattern;public WebSocketHandler(String filterUrlRegx) {if (StrKit.isBlank(filterUrlRegx))throw new IllegalArgumentException("The para filterUrlRegx can not be blank.");filterUrlRegxPattern = Pattern.compile(filterUrlRegx);}@Overridepublic void handle(String target, HttpServletRequest request, HttpServletResponse response, boolean[] isHandled) {if (filterUrlRegxPattern.matcher(target).find())return ;elsenext.handle(target, request, response, isHandled);}}
JFinalConfig中配置
/*** 接收处理跳转*/@Overridepublic void configHandler(Handlers me) {me.add(new WebSocketHandler("^/websocket"));}配置WebSocket处理类
package com.nmtx.manager.controller.websocket;import java.io.IOException;import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;import com.jfinal.kit.JsonKit;
import com.jfinal.plugin.redis.Redis;
import com.nmtx.common.ErrorCode;
import com.nmtx.common.MessageResp;
import com.nmtx.manager.common.base.LoggerManager;
import com.nmtx.manager.model.message.Message;
import com.nmtx.manager.model.permission.User;
import com.nmtx.manager.utils.WebSocketSessionUtils;
import com.nmtx.plugins.auth.AuthUser;
import com.nmtx.utils.ModelUtils;@ServerEndpoint("/websocket")
public class WebSocketController {@OnOpenpublic void onOpen(Session session) {}@OnClosepublic void onClose(Session session) {}@OnMessagepublic void onMessage(String requestJson, Session session) {session.getBasicRemote().sendText(requestJson);}
}三，html5端请求
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"> <!-- for HTML5 --><title>Java后端WebSocket的Tomcat实现</title>
</head>
<body>Welcome<br/><input id="text" type="text"/><button onclick="send()">发送消息</button><hr/><button onclick="closeWebSocket()">关闭WebSocket连接</button><hr/><div id="message"></div>
</body><script type="text/javascript">var websocket = null;//判断当前浏览器是否支持WebSocketif ('WebSocket' in window) {websocket = new WebSocket("ws://localhost:8080/websocket");}else {alert('当前浏览器 Not support websocket')}//连接发生错误的回调方法websocket.onerror = function () {setMessageInnerHTML("WebSocket连接发生错误");};//连接成功建立的回调方法websocket.onopen = function () {setMessageInnerHTML("WebSocket连接成功");}//接收到消息的回调方法websocket.onmessage = function (event) {setMessageInnerHTML(event.data);}//连接关闭的回调方法websocket.onclose = function () {setMessageInnerHTML("WebSocket连接关闭");}//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 () {closeWebSocket();}//将消息显示在网页上function setMessageInnerHTML(innerHTML) {document.getElementById('message').innerHTML += innerHTML + '<br/>';}//关闭WebSocket连接function closeWebSocket() {websocket.close();}//发送消息function send() {var message = document.getElementById('text').value;websocket.send(message);}
</script>
</html>打包搞定