java中伺服器啟動時，執行定時任務

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package com.ripsoft.util;import java.util.Calendar;import java.util.Timer;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class TimerListener implements ServletContextListener{    private Timer timer = null;            @Override      public void contextInitialized(ServletContextEvent event) {          timer = new Timer(true);          event.getServletContext().log("定時器已啟動");               //設定執行時間        Calendar calendar = Calendar.getInstance();        int year = calendar.get(Calendar.YEAR);        int month = calendar.get(Calendar.MONTH);        int day = calendar.get(Calendar.DAY_OF_MONTH);//每天        //定製每天的11:00:00執行        calendar.set(year, month, day, 11, 00, 00);        java.util.Date date = calendar.getTime();        int period = 30 * 1000;        //每天的date時刻執行TestTask，每隔30秒重複執行        timer.schedule(new TestTask(), date, period);        //每天的date時刻執行TestTask, 僅執行一次        //timer.schedule(new TestTask(), date);    }        @Override      public void contextDestroyed(ServletContextEvent event) {          if (timer != null) {              timer.cancel();              event.getServletContext().log("定時器銷毀");          }      }  }

package com.ripsoft.util;import java.util.TimerTask;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;public class TestTask extends TimerTask{    protected final Log logger = LogFactory.getLog(getClass());            private static boolean isRunning = false;        @Override      public void run() {          if (!isRunning) {              isRunning = true;              logger.info("開始執行任務。");                int i = 0;              while (i++ < 10) {                  logger.info("已完成任務的" + i + "/" + 10);              }                isRunning = false;              logger.info("任務執行結束。");            } else {              logger.info("上一次任務執行還未結束，本次任務不能執行。");          }        }  }

1.TestTimerListener.java執行定時任務，實現servlet的ServletContextListener介面，當伺服器啟動時開始執行TestTask任務

2.想要任務在伺服器啟動時定時執行，就要藉助監聽實現需要在web.xml中做如下配置

    <listener>        <listener-class>com.ripsoft.util.TimerListener</listener-class>    </listener>

java中伺服器啟動時，執行定時任務