springmvc框架定时器功能实现和service注入问题解决

1、在SpringMVC配置文件中添加

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

http://www.springframework.org/schema/task  http://www.springframework.org/schema/task/spring-task-3.2.xsd 

配置任务扫描

<task:annotation-driven />

配置扫描任务位置

<!-- 扫描任务 -->    <context:component-scan base-package="com.vrveis.roundTrip.task" />

2、如果定时器方法单独写在一个工具类里，没有配置扫描该文件夹，注入service就会失败，可以通过SpringContextUtil类调用

具体代码如下：

package com.test.controller.base;import org.apache.log4j.Logger;import org.springframework.beans.BeansException;import org.springframework.beans.factory.NoSuchBeanDefinitionException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.stereotype.Component;/** * 在Spring 注解中，普通类获取@Service标记的方法或者bean对象 */@Componentpublic class SpringContextUtil implements ApplicationContextAware {    private static Logger logger = Logger.getLogger(SpringContextUtil.class);    private static ApplicationContext applicationContext = null;    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException    {        logger.info("------SpringContextUtil setApplicationContext-------");        SpringContextUtil.applicationContext = applicationContext;    }    public static ApplicationContext getApplicationContext() {        return applicationContext;    }    /**     * 注意 bean name默认 = 类名(首字母小写)     * 例如: A8sClusterDao = getBean("a8sClusterDao")     * @param name     * @return     * @throws BeansException     */    public static Object getBean(String name) throws BeansException {        return applicationContext.getBean(name);    }    /**     * 根据类名获取到bean     * @param <T>     * @param clazz     * @return     * @throws BeansException     */    @SuppressWarnings("unchecked")    public static <T> T getBeanByName(Class<T> clazz) throws BeansException {        try {            char[] cs=clazz.getSimpleName().toCharArray();            cs[0] += 32;//首字母大写到小写            return (T) applicationContext.getBean(String.valueOf(cs));        } catch (Exception e) {            e.printStackTrace();            return null;        }     }    public static boolean containsBean(String name) {        return applicationContext.containsBean(name);    }    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {        return applicationContext.isSingleton(name);    }}

调用方法：

//获取 Bean  注意bean的首字母小写   RcpqService rcpqService=(RcpqService) SpringContextUtil.getBean("rcpqService");

3、利用监听器，实现定时器功能：

在web.xml中设置监听器：

<listener>    <listener-class>com.test.listener.MyTimerTaskListener</listener-class>  </listener>

监听器代码如下：

package com.test.listener;import java.util.Calendar;import java.util.Timer;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import com.test.util.MyTimerTask;/** * @author snwei */public class MyTimerTaskListener implements ServletContextListener {    private Timer timer = null;    @Override    public void contextDestroyed(ServletContextEvent arg0) {        timer.cancel();    }    @Override    public void contextInitialized(ServletContextEvent arg0) {        System.out.println("-----开始启动定时器------");        Calendar firstStart = Calendar.getInstance();        firstStart.set(Calendar.HOUR_OF_DAY, 0);        firstStart.set(Calendar.MINUTE, 10);        firstStart.set(Calendar.SECOND, 0);        timer = new Timer(true);        //第一次是凌晨0:10:00执行，间隔24小时执行一次        timer.schedule(new MyTimerTask(), firstStart.getTime(), 1000*60*60*24);                //timer.scheduleAtFixedRate(task, delay, intevalPeriod);//严格按照调度时间来的,时间不会顺延    //timer.schedule(task, new Date(), intevalPeriod);//如果某一次调度时间比较长，那么后面的时间会顺延，保证调度间隔        //timer.scheduleAtFixedRate(new MyTimerTask(), 0, 1000*60*10);  //测试    }}

定时器业务代码如下：

package com.test.util;import java.text.SimpleDateFormat;import java.util.Date;import java.util.List;import java.util.TimerTask;import com.test.controller.base.SpringContextUtil;import com.test.service.manager.rcpq.RcpqService;/** * 定时器 */public class MyTimerTask extends TimerTask{    @Override    public void run() {    //获取 Bean    RcpqService rcpqService=(RcpqService) SpringContextUtil.getBean("rcpqService");//调用service方法，业务代码实现...    }}