Quartz( Timer )

Use steps

1. Guide pack

    <!-- Clean up regularly jar package -->
           <dependency>
               <groupId>org.quartz-scheduler</groupId>
               <artifactId>quartz</artifactId>
           </dependency>
           <dependency>
               <groupId>org.quartz-scheduler</groupId>
               <artifactId>quartz-jobs</artifactId>
           </dependency>
   

2. Customize a Job( Scheduled tasks )

   public class ClearImg {
         
       @Autowired
       private JedisPool jedisPool;
   
       public  void clearImg(){
         
           System.out.println(jedisPool);
           // Put all the contents 
           Set<String> set = jedisPool.getResource().sdiff(RedisConstant.SETMEAL_PIC_RESOURCES, RedisConstant.SETMEAL_PIC_DB_RESOURCES);
           if(set!=null){
         
               // Call the delete method 
               for (String s : set) {
         
                   QiniuUtils.deleteFileFromQiniu(s);
                   // eliminate redis Junk pictures in 
                   jedisPool.getResource().srem(RedisConstant.SETMEAL_PIC_RESOURCES,s);
               }
           }
       }
   }
   
   

3. Accessories Spring-jobs Configuration file for

   1. Will make it up to you job Configuration to Spring in

      <!--  Register custom Job -->
          <bean id="jobDemo" class="com.itheima.jobs.ClearImg"></bean>
      

   2. register JobDetail, The action is responsible for invoking the specified through reflection job

      <bean id="jobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
              <!--  Inject the target object  -->
              <property name="targetObject" ref="jobDemo"/>
              <!--  Inject target method  -->
              <property name="targetMethod" value="clearImg"/>
      </bean>
      

   3. Register a trigger , Specify when the task is triggered

      <bean id="myTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
              <!--  Inject JobDetail  That is, who will execute  -->
              <property name="jobDetail" ref="jobDetail"/>
              <!--  Specify the trigger time , be based on Cron expression   Specify how often  -->
              <property name="cronExpression">
                  <value>0 0 0/1 * * ? </value>
              </property>
          </bean>
      

   4. Register a unified dispatching factory , Through this scheduling factory, scheduling tasks

      <bean id="scheduler" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
              <!--  Inject multiple triggers  -->
           <property name="triggers">
               <list>
               <!--  trigger 1 -->
               <ref bean="myTrigger"/>
               <!--  trigger 2 -->
               <res bean="xXX">
      		 <!-- .... -->
               </list>
           </property>
      </bean>
      

Cron expression

• Altogether 7 position , What is often used is 6 position

• From right to right ： second branch when Japan Zhou year

• Online generation Cron expression

  https://cron.qqe2.com/