• Springboot+websocket+定时器实现消息推送


    由于最近有个需求,产品即将到期(不同时间段到期)时给后台用户按角色推送,功能完成之后在此做个小结

    1. 在启动类中添加注解@EnableScheduling

    package com.hsfw.backyard.websocket333;
    
    /**
     * @Description
     * @Author: liucq
     * @Date: 2019/1/25
     */
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.builder.SpringApplicationBuilder;
    import org.springframework.boot.web.support.SpringBootServletInitializer;
    import org.springframework.scheduling.annotation.EnableScheduling;
    
    @SpringBootApplication
    @MapperScan("com.siwei.insurance.*.dao")
    /**
     *  //该注解是开启定时任务的支持
     */
    @EnableScheduling
    public class lifeInsuranceApplication extends SpringBootServletInitializer {
        @Override
        protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
            return builder.sources(lifeInsuranceApplication.class);
        }
    
        public static void main(String[] args) {
            SpringApplication.run(lifeInsuranceApplication.class, args);
        }
    }

    2. 写定时器

    package com.hsfw.backyard.websocket333;
    
    /**
     * @Description
     * @Author: liucq
     * @Date: 2019/1/25
     */
    
    import com.siwei.insurance.permission.dao.RolePermissionDao;
    import com.siwei.insurance.productManage.dao.ExpirePushMsgMapper;
    import com.siwei.insurance.productManage.service.ProductService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.scheduling.annotation.Scheduled;
    
    import java.util.ArrayList;
    import java.util.List;
    
    @Componentpublic
    class ProductExpireTask {
        @Autowired
        private RolePermissionDao rolePermissionDao;
        @Autowired
        private ProductService productService;
        @Autowired
        private ExpirePushMsgMapper expirePushMsgMapper;
    
        /**
         * 每天早上0点执行
         */
    
        @Scheduled(cron = "0 0 0 1/1 * ?")
        public void productExpire() {
            //距离到期还有一个月提醒
            String oneMonthExpireDate = DateUtil.addOneMonth();
            dealExpireProduct(oneMonthExpireDate);
            //距离到期还有一天提醒
            String oneDayExpireDate = DateUtil.addOneDay();
            dealExpireProduct(oneDayExpireDate);
            //距离到期还有一周提醒
            String oneWeekExpireDate = DateUtil.addFewDays(7);
            dealExpireProduct(oneWeekExpireDate);
        }
    
        private void dealExpireProduct(String expireDate) {
            List<Map<String, Object>> expireProductMapList = productService.findExpireProducts(expireDate);
            if (expireProductMapList != null && !expireProductMapList.isEmpty()) {
                // 根据路径查询需要推送的角色
                List<String> needPushRoleIds = rolePermissionDao.findNeedPushRoleIdByUrl(TotalConstant.PRODUCT_PUSH_URL);
                List<ExpirePushMsg> expirePushMsgs = new ArrayList<>();
                for (Map<String, Object> expireProductMap : expireProductMapList) {
                    ExpirePushMsg expirePushMsg = new ExpirePushMsg();
                    expirePushMsg.setNeedPushEntityId((int) expireProductMap.get("id"));
                    expirePushMsg.setNeedPushEntityNo((String) expireProductMap.get("insuranceNo"));
                    String productName = (String) expireProductMap.get("insuranceName");
                    expirePushMsg.setNeedPushEntityName(productName);
                    //设置此推送消息的到期时间
                    expirePushMsg.setExpireDate(DateUtil.stringToDate(DateUtil.addOneDay()));
                    expirePushMsg.setPushType(2);
                    StringBuffer needPushRoleIdString = new StringBuffer();
                    needPushRoleIds.forEach(e -> needPushRoleIdString.append(e + ";"));
                    expirePushMsg.setPushRoleId(needPushRoleIdString.toString().trim());
                    String productExpireDateString = DateUtil.dateToShotString((Date) expireProductMap.get("expiryDate"));
                    expirePushMsg.setPushMsg("您的产品:" + productName + ",将于" + productExpireDateString + "即将过期,请及时处理!");
                    expirePushMsgs.add(expirePushMsg);
                }
                expirePushMsgMapper.insertAll(expirePushMsgs);
            }
        }
    
        @Scheduled(cron = "0 0 0 1/1 * ?")
        public void pushMsgExpire() {
            String oneDayExpireDate = DateUtil.getZeroTime(DateUtil.addOneDay());
            //推送消息只存在一天,根据到期时间将数据删除
            expirePushMsgMapper.deleteByExpireDate(oneDayExpireDate);
        }
    }

    DateUtil工具类

    package com.hsfw.backyard.websocket333;
    
    /**
     * @Description
     * @Author: liucq
     * @Date: 2019/1/25
     */
    
    import org.apache.commons.lang3.StringUtils;
    
    import java.text.ParsePosition;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    /**
     * @Description 时间处理工具类  * @author linxiunan * @date 2018年9月3日
     */
    public class DateUtil {
        private static final SimpleDateFormat dayOfDateFormat = new SimpleDateFormat("yyyy-MM-dd");
        private static final SimpleDateFormat secondOfDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
        /**
         * @return 当天时间加一天,返回"yyyy-MM-dd"格式
         */
        public static String addOneDay() {
            Calendar calendar = Calendar.getInstance();
            calendar.add(Calendar.DAY_OF_MONTH, 1);
            return dayOfDateFormat.format(calendar.getTime());
        }
    
        /**
         * @return 当天时间加一月,返回"yyyy-MM-dd"格式
         */
        public static String addOneMonth() {
            Calendar calendar = Calendar.getInstance();
            calendar.add(Calendar.MONTH, 1);
            return dayOfDateFormat.format(calendar.getTime());
        }
    
        /**
         * @param dayNumber 加的天数     * @return 返回当天时间添加几天之后的时间,返回"yyyy-MM-dd"格式
         */
        public static String addFewDays(int dayNumber) {
            Calendar calendar = Calendar.getInstance();
            calendar.add(Calendar.DAY_OF_MONTH, dayNumber);
            return dayOfDateFormat.format(calendar.getTime());
        }
    
        /**
         * @param dateString 需要转换成时间格式的日期字符串     * @return 返回字符串转换成的时间
         */
        public static Date stringToDate(String dateString) {
            ParsePosition parsePosition = new ParsePosition(0);
            if (dateString.contains(" ")) {
                return secondOfDateFormat.parse(dateString, parsePosition);
            } else {
                return dayOfDateFormat.parse(dateString, parsePosition);
            }
        }
    
        /**
         * @param date 需要转换成字符串格式的日期     * @return 返回"yyyy-MM-dd"格式的转换后的字符串
         */
        public static String dateToShotString(Date date) {
            return dayOfDateFormat.format(date);
        }
    
        /**
         * @param date 需要转换成字符串格式的日期     * @return 返回"yyyy-MM-dd HH:mm:ss"格式的转换后的字符串
         */
        public static String dateToLongString(Date date) {
            return secondOfDateFormat.format(date);
        }
    
        /**
         * @param dateString 需要获取0点的时间字符串,如果获取当天0点,传null即可     * @return 返回"yyyy-MM-dd HH:mm:ss"格式的某天0点字符串
         */
        public static String getZeroTime(String dateString) {
            if (StringUtils.isBlank(dateString)) {
                Calendar calendar = Calendar.getInstance();
                calendar.set(Calendar.HOUR_OF_DAY, 0);
                calendar.set(Calendar.MINUTE, 0);
                calendar.set(Calendar.SECOND, 0);
                return secondOfDateFormat.format(calendar.getTime());
            } else {
                Date date = stringToDate(dateString);
                return dateToLongString(date);
            }
        }
    }

    3. 引入websocket所需jar包

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-websocket</artifactId>
    </dependency>

    4. 配置websocket

    编写MyEndpointConfigure类

    package com.hsfw.backyard.websocket333;
    
    /**
     * @Description
     * @Author: liucq
     * @Date: 2019/1/25
     */
    
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.BeanFactory;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    
    import javax.websocket.server.ServerEndpointConfig;
    
    public class MyEndpointConfigure extends ServerEndpointConfig.Configurator implements ApplicationContextAware {
        private static volatile BeanFactory context;
    
        @Override
        public <T> T getEndpointInstance(Class<T> clazz) throws InstantiationException {
            return context.getBean(clazz);
        }
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
            MyEndpointConfigure.context = applicationContext;
        }
    }

    websocket配置类

    package com.hsfw.backyard.websocket333;
    
    /**
     * @Description
     * @Author: liucq
     * @Date: 2019/1/25
     */
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.socket.server.standard.ServerEndpointExporter;
    
    @Configuration
    public class WebSocketConfig {
        @Bean
        public ServerEndpointExporter serverEndpointExporter() {
            return new ServerEndpointExporter();
        }
    
        @Bean
        public MyEndpointConfigure newConfigure() {
            return new MyEndpointConfigure();
        }
    }

    这里需要重点说明一下,在websocket配置类中,第一个配置是因为使用springboot内置容器,自己开发时需要配置,如果有独立的容器需要将其注释掉,也就意味着,如果将项目打成WAR包,部署到服务器,使用Tomcat启动时,需要注释掉ServerEndpointExporter配置;MyEndpointConfigure配置是因为我的需求需要,需要在websocket类中注入service层或者dao层的接口,MyEndpointConfigure配置就是为了解决websocket无法注入的问题,如果没有需要可以不用配置
    ---------------------

    5. websocket类

    package com.hsfw.backyard.websocket333;
    
    /**
     * @Description
     * @Author: liucq
     * @Date: 2019/1/25
     */
    
    import org.apache.commons.lang.StringUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    import javax.websocket.OnClose;
    import javax.websocket.OnError;
    import javax.websocket.OnMessage;
    import javax.websocket.OnOpen;
    import javax.websocket.server.PathParam;
    import javax.websocket.server.ServerEndpoint;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.concurrent.CopyOnWriteArraySet;
    
    @Component
    @ServerEndpoint(value = "/productWebSocket/{userId}", configurator = MyEndpointConfigure.class)
    public class ProductWebSocket {
        // 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ProductWebSocket对象。
        private static CopyOnWriteArraySet<ProductWebSocket> webSocketSet = new CopyOnWriteArraySet<ProductWebSocket>();
        // 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;
        @Autowired
        private UserRoleDao userRoleDao;
        @Autowired
        private ExpirePushMsgMapper expirePushMsgMapper;
        private Logger log = LoggerFactory.getLogger(ProductWebSocket.class);
    
        /**
         * 连接建立成功调用的方法
         */
        @OnOpen
        public void onOpen(@PathParam("userId") String userId, Session session) {
            log.info("新客户端连入,用户id:" + userId);
            this.session = session;
            webSocketSet.add(this); // 加入set中
            addOnlineCount(); // 在线数加1
            // 相关业务处理,根据拿到的用户ID判断其为那种角色,根据角色ID去查询是否有需要推送给该角色的消息,有则推送
            if (StringUtils.isNotBlank(userId)) {
                List<String> roleIds = userRoleDao.findRoleIdByUserId(userId);
                List<String> totalPushMsgs = new ArrayList<String>();
                for (String roleId : roleIds) {
                    List<String> pushMsgs = expirePushMsgMapper.findPushMsgByRoleId(roleId);
                    if (pushMsgs != null && !pushMsgs.isEmpty()) {
                        totalPushMsgs.addAll(pushMsgs);
                    }
                }
                if (totalPushMsgs != null && !totalPushMsgs.isEmpty()) {
                    totalPushMsgs.forEach(e -> sendMessage(e));
                }
            }
        }
    
        /**
         * 连接关闭调用的方法
         */
        @OnClose
        public void onClose() {
            log.info("一个客户端关闭连接");
            webSocketSet.remove(this); // 从set中删除
            subOnlineCount(); // 在线数减1
        }
    
        /**
         * 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
         */
        @OnMessage
        public void onMessage(String message, Session session) {
        }
    
        /**
         * 发生错误时调用
         */
        @OnError
        public void onError(Session session, Throwable error) {
            log.error("websocket出现错误");
            error.printStackTrace();
        }
    
        public void sendMessage(String message) {
            try {
                this.session.getBasicRemote().sendText(message);
                log.info("推送消息成功,消息为:" + message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    
        /**
         * 群发自定义消息
         */
        public static void sendInfo(String message) throws IOException {
            for (ProductWebSocket productWebSocket : webSocketSet) {
                productWebSocket.sendMessage(message);
            }
        }
    
        public static synchronized int getOnlineCount() {
            return onlineCount;
        }
    
        public static synchronized void addOnlineCount() {
            ProductWebSocket.onlineCount++;
        }
    
        public static synchronized void subOnlineCount() {
            ProductWebSocket.onlineCount--;
        }
    }

    这样后台的功能基本上就算是写完了,前端配合测试一下

    6. 前端测试

    写一个页面,代码如下

    <!DOCTYPE HTML>
    <html>
    <head>
        <title>My WebSocket</title>
    </head>
     
     
    <body>
    Welcome<br/>
    <input id="text" type="text" /><button onclick="send()">Send</button>    <button onclick="closeWebSocket()">Close</button>
    <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/productWebSocket/001");
        }
        else{
            alert('Not support websocket')
        }
     
     
        //连接发生错误的回调方法
        websocket.onerror = function(){
            setMessageInnerHTML("error");
        };
     
     
        //连接成功建立的回调方法
        websocket.onopen = function(event){
            setMessageInnerHTML("open");
        }
     
     
        //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("close");
        }
     
     
        //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(){
            websocket.close();
        }
     
     
        //将消息显示在网页上
        function setMessageInnerHTML(innerHTML){
            document.getElementById('message').innerHTML += innerHTML + '<br/>';
        }
     
     
        //关闭连接
        function closeWebSocket(){
            websocket.close();
        }
     
     
        //发送消息
        function send(){
            var message = document.getElementById('text').value;
            websocket.send(message);
        }
    </script>
    </html>

    项目启动之后,打开页面

    open下方就是我添加的消息,可以看出已经成功推送,到此该功能就算完成结束了

    参考地址:https://www.cnblogs.com/bianzy/p/5822426.html

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  • 原文地址:https://www.cnblogs.com/dand/p/10319031.html
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