Posted on 2006-03-13 12:17
lubaolin 閱讀(433)
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轉(zhuǎn)貼自：
http://spaces.msn.com/copperlive/blog/cns!CB05AC024B0570E0!126.entry
| 用Java寫(xiě)的定時(shí)任務(wù) |
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用Java定的定時(shí)任務(wù)，有的時(shí)候在執(zhí)行一些后臺(tái)任務(wù)時(shí)很有用
listenBean.java
import javax.servlet.*;
import java.util.*;
public class listenerBean implements ServletContextListener {
private java.util.Timer timer = null;
public void contextInitialized(ServletContextEvent event) {
timer = new Timer(true);
//定時(shí)器已啟動(dòng)
timer.schedule(new MyTask(), 0, (long) 1000*60);//定時(shí)1分鐘
//已經(jīng)添加任務(wù)調(diào)度表
}
public void contextDestroyed(ServletContextEvent event) {
timer.cancel();
//定時(shí)器銷(xiāo)毀
}
}
class MyTask extends TimerTask {
private static boolean isRunning = false;
public void run() {
if (!isRunning) {
isRunning = true;
//開(kāi)始執(zhí)行任務(wù)
//ToDo ....
//執(zhí)行任務(wù)完成
isRunning = false;
} else {
//上一次任務(wù)執(zhí)行還未結(jié)束
}
}
}
web.xml
<web-app>
<listener>
<listener-class>listenerBean</listener-class>
</listener>
</web-app> |