Java 定时器 定点执行

web.xml里监听
<listener>
     <listener-class>com.tzx.common.util.ftpscan.TimerRun</listener-class>
</listener>

package com.tzx.common.util.ftpscan;

import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;





public class TimerRun implements ServletContextListener {
	private static Log log = LogFactory.getLog(TimerRun.class);
	private ScheduledExecutorService executorService = Executors
			.newScheduledThreadPool(1);

	public void contextDestroyed(ServletContextEvent arg0) {
		executorService.shutdown();

	}

	public void contextInitialized(ServletContextEvent arg0) {
		log.info("------定时--execute---ftpService--start------");
		run();
		log.info("------定时--execute---ftpService--end------");
	}

	/**
	 * 定时执行 每天凌晨定时执行任务
	 */
	private void run() {
		long oneDay = 24 * 60 * 60 * 1000;
		long initDelay = getTimeMillis("23:59:59") - System.currentTimeMillis();
		initDelay = initDelay > 0 ? initDelay : oneDay + initDelay;

		executorService.scheduleAtFixedRate(new Runnable() {
			public void run() {
				try {
					FTPListAllFiles.ftpService();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}, initDelay, oneDay, TimeUnit.MILLISECONDS);
		
	}

	/**
	 * 获取指定时间对应的毫秒数
	 * 
	 * @param time
	 *            "HH:mm:ss"
	 * @return
	 */
	private static long getTimeMillis(String time) {
		try {
			DateFormat dateFormat = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
			DateFormat dayFormat = new SimpleDateFormat("yy-MM-dd");
			Date curDate = dateFormat.parse(dayFormat.format(new Date()) + " "
					+ time);
			return curDate.getTime();
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return 0;
	}
}

评论

1 楼 u011314252 2014-12-25  

紫龙霸气啊啊啊啊