按说只在tomcat启动时执行一次，我们可以用监听器来实现，但是有些开发框架中因特殊场景不适合用监听器。那么定时任务也可以实现只执行一次的操作。配置如下
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<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <bean id="publicWebServiceJob" class="cn.org.site.business.quartz.PublicWebServiceScheduleJob"/> <bean id="publicWebServiceJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"> <property name="targetObject" ref="publicWebServiceJob" /> <property name="targetMethod" value="doJob"></property> <!--默认允许并发执行，设置为false 防止并发执行 发生死锁问题 --> <property name="concurrent" value="false"/> </bean> <!-- quartz一分钟执行一次的实现方式 --> <!-- <bean id="publicWebServiceTriggerBean" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean"> <property name="jobDetail" ref="publicWebServiceJobDetail"></property> <property name="cronExpression" value="0 */1 * * * ?"></property> <property name="description" value="定时"></property> </bean>--> <!-- quartz实例化5秒后执行一次job的方式 --> <bean id="publicWebServiceTriggerBean" class="org.springframework.scheduling.quartz.SimpleTriggerFactoryBean"> <property name="jobDetail" ref="publicWebServiceJobDetail" /> <property name="startDelay" value="5000" /> <!-- 启动延迟 单位/毫秒--> <property name="repeatCount" value="0" /> <!-- 重复次数 --> </bean> <!-- 触发器--> <bean id="schedulerFactoryBean-em" lazy-init="false" class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> <property name="triggers"> <list> <ref bean="publicWebServiceTriggerBean"/> </list> </property> </bean> </beans>