spring+springmvc实现websoket1

港控/mmm° 2022-06-08 04:54 57阅读 0赞

## 用注解@ServerEndpoint(“/websocket”) ##

1.  两种方法实现代码地址(包含相关jar包) :[http://pan.baidu.com/s/1dF2ElVV][http_pan.baidu.com_s_1dF2ElVV] 密码：8x6x  
    方法1：用注解@ServerEndpoint(“/websocket”)  
    方法2：spring-websocket-4.3.6.RELEASE.jar实现
2.  注解@ServerEndpoint(“/websocket”)实现websoket(实现定时向浏览器发送定时任务)  
    配置文件applicationContext-java.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
    
    
        <bean name="monitor" class="com.spring.java.websocket.Monitor" lazy-init="false" init-method="sendMsg"></bean>
        </beans>

Monitor类

package com.spring.java.websocket;
    import com.spring.java.websocket.WebSocketTest;
    
    import java.util.Date;
    import java.util.concurrent.Executors;
    import java.util.concurrent.ScheduledExecutorService;
    import java.util.concurrent.TimeUnit;
    
    
    public class Monitor implements Runnable { 
    
    
        @Override
        public void run() {
            WebSocketTest webSocketTest = new WebSocketTest();
            webSocketTest.sendMsg("当前时间:" + new Date());
        }
    
        public void sendMsg() {
            ScheduledExecutorService newScheduledThreadPool = Executors.newSingleThreadScheduledExecutor();
            newScheduledThreadPool.scheduleWithFixedDelay(new Monitor(), 20, 5, TimeUnit.SECONDS);
        }
    }

测试类WebSocketTest

package com.spring.java.websocket;
    
    import javax.websocket.*;
    import javax.websocket.server.ServerEndpoint;
    import java.io.IOException;
    import java.util.concurrent.CopyOnWriteArraySet;
    
    
    /** * @ServerEndpoint 注解是一个类层次的注解，它的功能主要是将目前的类定义成一个websocket服务器端, * 注解的值将被用于监听用户连接的终端访问URL地址,客户端可以通过这个URL来连接到WebSocket服务器端 * @author uptop */
    @ServerEndpoint("/websocket")
    public class WebSocketTest { 
        //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
        private static int onlineCount = 0;
    
        //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。若要实现服务端与单一客户端通信的话，可以使用Map来存放，其中Key可以为用户标识
        public static CopyOnWriteArraySet<WebSocketTest> webSocketSet = new CopyOnWriteArraySet<WebSocketTest>();
    
        //与某个客户端的连接会话，需要通过它来给客户端发送数据
        private Session session;
    
        /** * 连接建立成功调用的方法 * * @param session 可选的参数。session为与某个客户端的连接会话，需要通过它来给客户端发送数据 */
        @OnOpen
        public void onOpen(Session session) {
            this.session = session;
            webSocketSet.add(this);     //加入set中
            addOnlineCount();           //在线数加1
            System.out.println("有新连接加入！当前在线人数为" + getOnlineCount());
        }
    
        /** * 连接关闭调用的方法 */
        @OnClose
        public void onClose() {
            webSocketSet.remove(this);  //从set中删除
            subOnlineCount();           //在线数减1
            System.out.println("有一连接关闭！当前在线人数为" + getOnlineCount());
        }
    
        /** * 收到客户端消息后调用的方法 * * @param message 客户端发送过来的消息 * @param session 可选的参数 */
        @OnMessage
        public void onMessage(String message, Session session) {
            System.out.println("来自客户端的消息:" + message);
            //群发消息
            for (WebSocketTest item : webSocketSet) {
                try {
                    item.sendMessage(message);
                } catch (IOException e) {
                    e.printStackTrace();
                    continue;
                }
            }
        }
    
        /** * 发生错误时调用 * * @param session * @param error */
        @OnError
        public void onError(Session session, Throwable error) {
            System.out.println("发生错误");
            error.printStackTrace();
        }
    
        /** * 这个方法与上面几个方法不一样。没有用注解，是根据自己需要添加的方法。 * * @param message * @throws IOException */
        public void sendMessage(String message) throws IOException {
            this.session.getBasicRemote().sendText(message);
    
        }
    
        public static synchronized int getOnlineCount() {
            return onlineCount;
        }
    
        public static synchronized void addOnlineCount() {
            WebSocketTest.onlineCount++;
        }
    
        public static synchronized void subOnlineCount() {
            WebSocketTest.onlineCount--;
        }
    
    
        public void sendMsg(String msg) {
            for (WebSocketTest item : webSocketSet) {
                try {
                    item.sendMessage(msg);
                } catch (IOException e) {
                    e.printStackTrace();
                    continue;
                }
            }
        }
    
    
    }

index.jsp文件

<%@ page language="java" pageEncoding="UTF-8" %>
    <!DOCTYPE html>
    <html>
    <head>
        <title>spring-javawebsoket</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>
        <table id="tb" class="altrowstable">
            <th align="center" colspan="9">实时信息监控</th>
        </table>
    </body>
    <script type="text/javascript" src="js/jqueryV2.2.3.min.js"></script>
    <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:8082/websoket_test/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) { var msg=innerHTML.split(" - ") var table=document.getElementById("tb"); var row; row=table.insertRow(1); for(var i=0;i<msg.length;i++){ var cell = row.insertCell(i); cell.appendChild(document.createTextNode(msg[i])); } if(table.rows.length>50){ table.deleteRow(table.rows.length-1); } // 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>

web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
    
        <context-param>
            <param-name>contextConfigLocation</param-name>
            
            
             
             <param-value>classpath:applicationContext-java.xml</param-value>
        </context-param>
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
        <listener>
            <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
        </listener>
        <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:springmvc.xml</param-value>
        </init-param>
      </servlet>
      <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.action</url-pattern>
      </servlet-mapping>
        <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
          <param-name>encoding</param-name>
          <param-value>utf-8</param-value>
        </init-param>
      </filter>
      <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>*.action</url-pattern>
      </filter-mapping>
    </web-app>

3.访问地址：[http://localhost:8082/websoket\_test/index.jsp][http_localhost_8082_websoket_test_index.jsp]  
![这里写图片描述][SouthEast]

[http_pan.baidu.com_s_1dF2ElVV]: http://pan.baidu.com/s/1dF2ElVV
[http_localhost_8082_websoket_test_index.jsp]: http://localhost:8082/websoket_test/index.jsp
[SouthEast]: /images/20220608/45457c84f6784c80ade4444ef4565fbd.png