JFinal整合WebSocket

2021-11-19 20:30:43

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

org.apache.tomcat
tomcat-websocket-api
7.0.47
provided

javax
javaee-api
7.0
provided

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);
    }
    @Override
    public void handle(String target, HttpServletRequest request, HttpServletResponse response, boolean[] isHandled) {
        if (filterUrlRegxPattern.matcher(target).find())
            return ;
        else
            next.handle(target, request, response, isHandled);
        
    }

}

JFinalConfig中配置

     /**
     * 接收处理跳转
     */
    @Override
    public 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 {

    
    @OnOpen
    public void onOpen(Session session) {
        
    }

    @OnClose
    public void onClose(Session session) {
        
    }

    @OnMessage
    public 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WebSocket
    if ('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>

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