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  • Spring 学习 5- task 定时任务

    Spring-Task

    1、这是网上的: 后面是我自己的配置

    Spring3.0以后自主开发的定时任务工具,spring task,可以将它比作一个轻量级的Quartz,而且使用起来很简单,除spring相关的包外不需要额外的包,而且支持注解和配置文件两种形式,下面将分别介绍这两种方式。

    第一种:配置文件方式

    第一步:编写作业类

    即普通的pojo,如下:

    import org.springframework.stereotype.Service;  
    @Service  
    public class TaskJob {  
          
        public void job1() {  
            System.out.println(“任务进行中。。。”);  
        }  
    }  

     第二步:在spring配置文件头中添加命名空间及描述

    <beans xmlns="http://www.springframework.org/schema/beans"  
        xmlns:task="http://www.springframework.org/schema/task"   
        。。。。。。  
        xsi:schemaLocation="http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd">  

     第三步:spring配置文件中设置具体的任务

     <task:scheduled-tasks>   
            <task:scheduled ref="taskJob" method="job1" cron="0 * * * * ?"/>   
    </task:scheduled-tasks>  
      
    <context:component-scan base-package=" com.gy.mytask " />  

    说明:ref参数指定的即任务类,method指定的即需要运行的方法,cron及cronExpression表达式,具体写法这里不介绍了,详情见上篇文章附录。

    <context:component-scan base-package="com.gy.mytask" />这个配置不消多说了,spring扫描注解用的。

    到这里配置就完成了,是不是很简单。

    第二种:使用注解形式

    也许我们不想每写一个任务类还要在xml文件中配置下,我们可以使用注解@Scheduled,我们看看源文件中该注解的定义:

    @Target({java.lang.annotation.ElementType.METHOD, java.lang.annotation.ElementType.ANNOTATION_TYPE})  
    @Retention(RetentionPolicy.RUNTIME)  
    @Documented  
    public @interface Scheduled  
    {  
      public abstract String cron();  
      
      public abstract long fixedDelay();  
      
      public abstract long fixedRate();  
    }  

     可以看出该注解有三个方法或者叫参数,分别表示的意思是:

    cron:指定cron表达式

    fixedDelay:官方文档解释:An interval-based trigger where the interval is measured from the completion time of the previous task. The time unit value is measured in milliseconds.即表示从上一个任务完成开始到下一个任务开始的间隔,单位是毫秒。

    fixedRate:官方文档解释:An interval-based trigger where the interval is measured from the start time of the previous task. The time unit value is measured in milliseconds.即从上一个任务开始到下一个任务开始的间隔,单位是毫秒。 

    下面我来配置一下。

    第一步:编写pojo

    import org.springframework.scheduling.annotation.Scheduled;    
    import org.springframework.stereotype.Component;  
      
    @Component(“taskJob”)  
    public class TaskJob {  
        @Scheduled(cron = "0 0 3 * * ?")  
        public void job1() {  
            System.out.println(“任务进行中。。。”);  
        }  
    }  

     第二步:添加task相关的配置:

    <?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:aop="http://www.springframework.org/schema/aop"  
        xmlns:context="http://www.springframework.org/schema/context"  
        xmlns:tx="http://www.springframework.org/schema/tx"  
        xmlns:task="http://www.springframework.org/schema/task"  
        xsi:schemaLocation="  
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd  
            http://www.springframework.org/schema/context   
    http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd  
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd  
            http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"  
        default-lazy-init="false">  
      
      
        <context:annotation-config />  
        <!—spring扫描注解的配置   -->  
        <context:component-scan base-package="com.gy.mytask" />  
          
    <!—开启这个配置,spring才能识别@Scheduled注解   -->  
        <task:annotation-driven scheduler="qbScheduler" mode="proxy"/>  
        <task:scheduler id="qbScheduler" pool-size="10"/>  

    说明:理论上只需要加上<task:annotation-driven />这句配置就可以了,这些参数都不是必须的。 

     Ok配置完毕,当然spring task还有很多参数,我就不一一解释了,

    具体参考xsd文档http://www.springframework.org/schema/task/spring-task-3.0.xsd。

    2、这是我自己的配置,可以正常运行的

    在springmvc-servlet.xml 中配置:

    <?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:p="http://www.springframework.org/schema/p"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xmlns:task="http://www.springframework.org/schema/task"  
        xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd  
        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"
            
        >
        
            <!-- Enables the Spring Task @Scheduled programming model -->  
            <task:executor id="executor" pool-size="5"/>
            <task:scheduler id="scheduler" pool-size="10"/>
            <task:annotation-driven executor="executor" scheduler="scheduler"/>
        
        <context:annotation-config /> 
        
     
     
    </beans>

    在java中的配置:

    /**
     * com.zywang.spring.task.SpringTaskDemo.java
     * @author ZYWANG 2011-3-9
     */
    package com.linemessage.application.module.messageschedule;
    
    import java.sql.SQLException;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.scheduling.annotation.Scheduled;
    import org.springframework.stereotype.Component;
     
    
    /**
     * Spring3 @Scheduled 演示
     * @author ZYWANG 2011-3-9
     */
    @Component
    public class StartSchedule {
        
        @Autowired
        private TMessageScheduleDAO iMssageScheduleDao;
    
        @Autowired
        private TMessageDAO iMssageDao;
        @Autowired
        private PrdCataDAO prdCataDAO;
        
        
        @Autowired
        private TGroupDAO iGroupDAO;
        @Autowired
        private TGroupUserRelDAO iGroupUserRelDAO;
    
        @Autowired
        private TProductDAO iProductDao;
    
        @Autowired
        private UserSubDAO iUserSubDao;
    
     
        @Autowired
        private TMessageStatusDAO iMssageStatusDao;
        
        @Autowired
        private TMessageDurationDAO iMssageDurationDao;
    
        @Autowired
        private TLocationDescDAO iTLocationDescDAO;
    
        @Autowired
        private ClientUserDAO iClientUserDao;
        @Autowired
        private TPublisherDAO iTPublisherDAO;
        
        @Autowired
        private TGroupUserRelDAO tGroupUserRelDAO;
        
    
        @Autowired
        private PublisherProductRelDAO publisherProductRelDao;
    
     
        @Autowired
        private TSubscribeDAO tSubScribeDAO; 
        
        
        @Scheduled(cron = "0 0/15 * * * ?")//每15分钟运行一次     
        void messageSchdule() throws SQLException{
            //System.out.println("I'm doing with cron now!");
            
            
               
            Date end_time = new Date(); 
            Date begin_time =new Date(end_time.getTime()-15*60*1000);  //暂时设置为15分钟与cron对应            
            TMessageScheduleExample scheduleE = new TMessageScheduleExample();
            scheduleE.createCriteria().andSendTimeBetween(begin_time,end_time).andIsvalidateEqualTo("1");           
               
            List<TMessageSchedule> schedules=    iMssageScheduleDao.selectByExample(scheduleE);
             
            for(TMessageSchedule tms:schedules)
            {
                 //从数据库取出消息
                TMessageExample messageE = new TMessageExample();
                messageE.createCriteria().andIdEqualTo(tms.getId());           
            
                List<TMessage> messages=    iMssageDao.selectByExampleWithBLOBs(messageE);
                TMessage message=messages.get(0);
            
                //取出接收人
                TMessageStatusExample statusExample = new TMessageStatusExample();
                statusExample.createCriteria().andMessageIdEqualTo(tms.getId());
                List<TMessageStatus> statusList=iMssageStatusDao.selectByExample(statusExample);
                //为所以接收人设置缓存
                
                for(TMessageStatus status:statusList)
                {
                    UserMessageCache.store(status.getDevicetoken(), "" + message.getId());
                }        
                
                //存储APPLE 手机的PUSHTOKEN
                List<String> applehash= new ArrayList<String>();
                
                List<TMessageStatus> appleList=iMssageStatusDao.selectByExample4Apple(statusExample);
                
                for (TMessageStatus status:appleList)
                {
                
                    //如果是APPLE用户,则发送通知                 
                    applehash.add(status.getDevicetoken());
                }
                
            
            // 创建缓存,给终端用户使用,缓存对像
            SendMessage.store(message.getId() + "", message);
            
            //如果是苹果用户,发送通知            
            AppleSend sender= new AppleSendImpl(applehash,message.getTitle());
            sender.send();
            
            
            //做完之后,将t_mnessage_schedule的状态置为false
            
                // message
                TMessageSchedule messageSchedule = iMssageScheduleDao
                        .selectByPrimaryKey(message.getId());
                messageSchedule.setIsvalidate("0");
                iMssageScheduleDao.updateByPrimaryKeySelective(messageSchedule);
             
        }
            
            
            
            
            
            
            
            //==以下为清除过期Message
            TMessageDurationExample TMDExample = new TMessageDurationExample();
            TMDExample.createCriteria().andIsvalidateEqualTo("1").andEndTimeLessThan(new Date());
           List<TMessageDuration> messageDList=iMssageDurationDao.selectByExample(TMDExample);     
            for(TMessageDuration tms:messageDList)
            {
                 
                tms.setIsvalidate("0");
                iMssageDurationDao.updateByPrimaryKeySelective(tms);
                
                
                TMessageStatusExample statusExample = new TMessageStatusExample();
                statusExample.createCriteria().andMessageIdEqualTo(tms.getMessageId()).andStatusNotEqualTo("0");
                List<TMessageStatus> statusList=iMssageStatusDao.selectByExample(statusExample);
                List<String>userIds=new ArrayList<String>();
                for(TMessageStatus status:statusList)
                {
                    userIds.add(status.getDevicetoken());
                    
                }         
             for (String deviceToken:userIds)
             {     
                UserMessageCache.remove(deviceToken,String.valueOf(tms.getMessageId()));
             }            
            SendMessage.remove(String.valueOf(tms.getMessageId()));
            
            // message
            }
         
    }
            
         
     

     参考 Spring定时任务的几种实现

     

     

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  • 原文地址:https://www.cnblogs.com/aspirant/p/6934060.html
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