动态指定定时时间

 

 

思路：
传统的xml配置：

触发器配置部分：

  

< bean  id ="companyCronSJGSR3F2"  class ="org.springframework.scheduling.quartz.CronTriggerBean"   >
         < property  name ="jobDetail" >
             < ref  bean ="companyReportSJGSR3F2" />
         property >
         < property  name ="cronExpression" >
             < value > 0 35 08 ? * * value >
         property >
bean >

 

如果能动态的给 cronExpression 赋值，就能实现我们的要求。

自定义一个类，继承了 CronTriggerBean

MyCronTrigger.java

 

public   class  MyCronTrigger  extends  CronTriggerBean
{
     public  JobManager jobManager;

     public  JobManager getJobManager()
    {
         return  jobManager;
    }

     public   void  setJobManager(JobManager jobManager)
    {
         this .jobManager  =  jobManager;
        String cronExpression  =  getCroExpression();
         try
        {
            setCronExpression(cronExpression);   // 关键，获得cronExpression,然后set回去
        }
         catch  (ParseException e)
        {
            e.printStackTrace();
        }
    }

     private  String getCroExpression()
    {
         return  jobManager.getExpression();
    }
}

 

JobManager.java

 

public   class  JobManager
{
     // 关键点，此类可以通过获得数据库连接，
     // 可以从数据库中取指定的expression
     public  String getExpression()
    {    
        String s = " 0 52 19 ? * * " ;
         return  s;
    }
}

 

croExpression.xml

 

xml version="1.0" encoding="UTF-8" ?>
DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "/web_data/dtd/spring-beans-2.0.dtd" >
< beans >
     < bean  id ="jobManager"  class ="com.dbjob.cro.JobManager" > bean >
    
     < bean  id ="JobTask"  class ="com.dbjob.cro.JobTask" > bean >
    
    
     < bean  id ="schedulerJobDetail"
        class ="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean" >
         < property  name ="targetObject"  ref ="JobTask"   />
         < property  name ="targetMethod"  value ="dojob"   />
         < property  name ="concurrent"  value ="false"   />
     bean >

     < bean  id ="cronTrigger"  class ="com.dbjob.cro.MyCronTrigger" >
         < property  name ="jobDetail"  ref ="schedulerJobDetail"   />
         < property  name ="jobManager"  ref ="jobManager"   />
     bean >

     < bean  id ="schedulerFactory"
        class ="org.springframework.scheduling.quartz.SchedulerFactoryBean" >
         < property  name ="triggers" >
             < list >
                 < ref  local ="cronTrigger"   />
             list >
         property >
     bean >
beans >

 

运行：主函数加载 spring 配置文件即可：

public   static   void  main(String[] args)
{
    ApplicationContext cxt = new  FileSystemXmlApplicationContext( " config/croExpression.xml " );
}

 

在web中应用　只要在web.xml中加载配置文件即可。