2016年10月7日 星期五

Servlet Time Task

使用 ServeltContextListener 來建立排程處理。

com.watchingdogs.RefundsDogs:
package com.watchingdogs;


import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class RefundsDogs implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {

        System.out.println("Start Timer Task");

        TimerTask myTimeTask = new MyTimeTask();
        Timer timer = new Timer();
        timer.schedule(myTimeTask, 1000, 1000 /* 1 Million Seconds*/ );
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
    }

    class MyTimeTask extends TimerTask {
        @Override
        public void run() {
            System.out.println("This is dog.");
        }
    }

}


之後將 com.watchingdogs.RefundsDogs  寫到 web.xml 的 listen-class 就行了:

<listener>
        <listener-class>
            com.watchingdogs.RefundsDogs
        </listener-class>
</listener>

Reference:
http://stackoverflow.com/questions/2248971/running-periodic-task-at-server-side-for-servlet-jsp-mvc-website

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© ERIC RILEY , 自由無須告知轉貼
Background Japanese Sayagata by Olga Libby