Java实现定时启动

2023-10-16 21:29:10

方法一：

1.web.xml中配置listener

<listener-class>

cn.com.jxlife.shs.web.action.csinquiry.surrender.MyListener

</listener-class>

</listener>

2.创建listener

import java.util.Timer;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

public class MyListener implements ServletContextListener {

private Timer timer = null;

@Override

public void contextInitialized(ServletContextEvent sce) {

timer = new Timer(true);

//设置任务计划，启动和间隔时间

timer.schedule(new MyTask(), 0, 3*60*1000);

//3分钟

//timer.schedule(new MyTask(), 0, 3*60*1000);

//在1秒后执行此任务,每次间隔2秒

//timer.schedule(new MyTask(), 1000, 2000);

}

@Override

public void contextDestroyed(ServletContextEvent sce) {

timer.cancel();

}

3.创建启动的类MyTask

import java.util.Date;

import java.util.TimerTask;

public class MyTask extends TimerTask {

@Override

public void run() {

System.out.println("call at " + (new Date()));

}

方法二：

spring 下实现定时工作的调度框架quartz

1.从http://quartz-scheduler.org/下载quartz的开源包

quartz-1.7.3.tar.gz

3.07M

2.从quartz-1.7.3.tar.gz 找到quartz-1.7.3.jar,放到项目的classpath下

(放到webroot/WEB-INF/lib)下

3.定义一个需要时间调度的程序

package com.machome.quartz;

public class CustomJob1 {

    public void onTimeWork() {
        System.out.println("数据备份任务启动");
        System.out.println("...");
        System.out.println("数据备份任务完成");
    }
}

4.剩余的工作就都在spring xml文件里完成了

<bean id="job1" class="com.machome.quartz.CustomJob1"></bean>

<bean id="jobtask1"
        class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        
        <property name="targetObject">
            <ref bean="job1" />
        </property>
        
        <property name="targetMethod">
            <value>onTimeWork</value>
        </property>
    </bean>

<bean id="trigger1"
        class="org.springframework.scheduling.quartz.CronTriggerBean">

        
        <property name="jobDetail">
            <ref bean="jobtask1" />
        </property>

        
        <property name="cronExpression">
            <value>10,15,20,25,30,35,40,45,50,55 * * * * ?</value>
        </property>
    </bean>

<bean id="scheduler" lazy-init="false"
        class="org.springframework.scheduling.quartz.SchedulerFactoryBean">

        
        <property name="triggers">
            <list>
                <ref bean="trigger1" />
            </list>
        </property>
    </bean>

5. 将spring 项目部署到TOMCAT或JBOSS服务器上

deploy项目
重启TOMCAT server

6. 看结果:

cron表达式参考：Quartz的cron表达式

Java实现定时启动

码农公寓

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