本以為spring定時任務挺簡單的,後來發現單純的進行檔案的配置有的時候定時任務並沒有執行,這是什麼原因呢?

通過看spring指導文件上的講解,以及通過對文件的理解做了一個Demo看一下，再說明這個問題。

1、demo的目錄結構

說明：圖中顯示的jar包都是需要的，親測缺少後會報錯

2、需要執行的任務類（這裡是沒有使用註解的，如果理解了下面的配置我覺得註解會更容易）

package com.schedule.task;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
 * 
 * 需要執行的任務
 * 
 * */
public class MyJob{
	/**
	 * @param 空
	 * @return void
	 * 執行方法列印系統當前時間
	 * */
	public void doIt(){
		 SimpleDateFormat myFmt=new SimpleDateFormat("yyyy年MM月dd日 HH時mm分ss秒");
		 Date now=new Date();
		 System.out.println(myFmt.format(now));
		
	}

}
 

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <servlet>
      <servlet-name>timer</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:timer-servlet.xml</param-value>
      </init-param>
  </servlet>
  <servlet-mapping>
      <servlet-name>timer</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>
 

<?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:context="http://www.springframework.org/schema/context"
 xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:p="http://www.springframework.org/schema/p"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 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/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd"
    default-lazy-init="false">   
    <bean id="myJob" class="com.schedule.task.MyJob"></bean>
    <bean id="jobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <property name="targetObject" ref="myJob"/>
        <property name="targetMethod" value="doIt"/>
        <property name="concurrent" value="false"/>
    </bean>
    <bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
        <property name="jobDetail" ref="jobDetail"/>
        <property name="cronExpression" value="*/2 * * * * ?"/>
    </bean>
    <bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <property name="triggers">
            <list>
                <ref bean="cronTrigger"/>
            </list>
        </property>
    </bean>
</beans>
 

<?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:context="http://www.springframework.org/schema/context"
 xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:p="http://www.springframework.org/schema/p"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 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/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
    http://www.springframework.org/schema/task
    http://www.springframework.org/schema/task/spring-task-4.1.xsd"
    default-lazy-init="false">
</beans>

6、在做的過程中遇到的問題：啟動之後，定時任務不執行

     （1）猜測是有關的類沒有找到，當ctrl+滑鼠左鍵點選下面這段程式碼的

org.springframework.scheduling.quartz.CronTriggerBean時，並沒有定位到原始碼，後來發現spring-4.1.6中已經沒有這個類了，spring指導文件已經將其換成

org.springframework.scheduling.quartz.CronTriggerFactoryBean

 <bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
        <property name="jobDetail" ref="jobDetail"/>
        <property name="cronExpression" value="*/2 * * * * ?"/>
    </bean>

  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

看來還是應該注重細節。

 寫的不好，主要讓自己認識到自己的錯誤，以此為鑑，也希望給大家提供一些參考。