spring定时器，定时器一次执行两次的问题

Spring 定时器

方法一：注解形式

配置文件头加上如下：

xmlns:task="http://www.springframework.org/schema/task"http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task.xsd

需要 quartz 包

<dependency>
        <groupId>org.quartz-scheduler</groupId>
        <artifactId>quartz</artifactId>
        <version>2.2.2</version>
</dependency>

 <!-- 扫描包 -->

<context:component-scan base-package="com.hehe.content.job" />
    <!-- 启动定时任务  -->
 <task:annotation-driven/>

@Component
public class MyTask {
    @Scheduled(cron="0 0 2 * * ?") // 每天凌晨2点执行，该方法不能有返回值
    public void taskCycle(){
        System.out.println("======================");
    }
}

方法二：xml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:aop="http://www.springframework.org/schema/aop" 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-4.1.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.1.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
       http://www.springframework.org/schema/task
       http://www.springframework.org/schema/task/spring-task.xsd">    <!-- 启动定时任务  -->
     <!-- <task:annotation-driven/>
     <context:component-scan base-package="com.hehe.content.job" />  -->    <!-- 要调用的工作类 -->
        <bean id="quartzJob" class="com.hehe.content.job.MyTask"></bean>
        <!-- 定义调用对象和调用对象的方法 -->
        <bean id="jobtask" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
            <!-- 调用的类 -->
            <property name="targetObject">
                <ref bean="quartzJob" />
            </property>
            <!-- 调用类中的方法 -->
            <property name="targetMethod">
                <value>taskCycle</value>
            </property>
        </bean>
        <!-- 定义触发时间 -->
        <bean id="doTime"
            class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
            <property name="jobDetail">
                <ref bean="jobtask" />
            </property>
            <!-- cron表达式 -->
            <property name="cronExpression">
                <value>0 0 2 * * ?</value>
            </property>
        </bean>          <!-- 总管理类 如果将lazy-init='false'那么容器启动就会执行调度程序 -->
        <bean id="startQuertz" lazy-init="false" autowire="no"
            class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
            <property name="triggers">
                <list>
                    <ref bean="doTime" />
                </list>
            </property>
        </bean>  </beans>