JFinal整合WebSocket開發

時間 2019-11-11

原文原文鏈接

說明以tomcat容器爲例，tomcat7以上版本開始支持websocket,JFinal集成的jetty服務器不支持websocketjavascript

1、包依賴，tomcat7或是javaee包都行，二者二選一，容器中已提供因此只做爲提供者html

<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>

2、JFinal的配置，須要一個Handler攔截websocket請求，WebSocketHandler實現以下html5

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java

/**
	 * 接收處理跳轉
	 */
	@Override
	public void configHandler(Handlers me) {
          me.add(new WebSocketHandler("^/websocket"));
	}

配置WebSocket處理類web

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端請求redis

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"> <!-- for HTML5 -->
    <title>Java後端WebSocket的Tomcat實現</title>
</head>
<body>
    Welcome<br/><input id="text" type="text"/>
    <button onclick="send()">發送消息</button>
    <hr/>
    <button onclick="closeWebSocket()">關閉WebSocket鏈接</button>
    <hr/>
    <div id="message"></div>
</body>

<script type="text/javascript">
    var websocket = null;
    //判斷當前瀏覽器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:8080/websocket");
    }
    else {
        alert('當前瀏覽器 Not support websocket')
    }

    //鏈接發生錯誤的回調方法
    websocket.onerror = function () {
        setMessageInnerHTML("WebSocket鏈接發生錯誤");
    };

    //鏈接成功創建的回調方法
    websocket.onopen = function () {
        setMessageInnerHTML("WebSocket鏈接成功");
    }

    //接收到消息的回調方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML(event.data);
    }

    //鏈接關閉的回調方法
    websocket.onclose = function () {
        setMessageInnerHTML("WebSocket鏈接關閉");
    }

    //監聽窗口關閉事件，當窗口關閉時，主動去關閉websocket鏈接，防止鏈接還沒斷開就關閉窗口，server端會拋異常。
    window.onbeforeunload = function () {
        closeWebSocket();
    }

    //將消息顯示在網頁上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //關閉WebSocket鏈接
    function closeWebSocket() {
        websocket.close();
    }

    //發送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>

打包搞定apache

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