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

 

 

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