Listener、Filter、Servlet与Java Web项目初始化的工作(3)

 
import java.util.TimerTask; 
import java.util.concurrent.Executors; 
import java.util.concurrent.TimeUnit; 
 
public class TimerTest { 
     
    private static int i = 0; 
     
    public static void initTimer(Long seconds) { 
        TimerTest.schedule(new TimerTask() { 
            public void run() { 
                callUsers(); 
            } 
        }, 0, seconds*1000); 
 
    } 
    public static void callUsers() { 
        System.out.println("Filter refreshed: " + ++i + " times."); 
    } 
 
    public static void schedule(TimerTask task, long delay, long period) { 
        Executors.newScheduledThreadPool(1).scheduleAtFixedRate(task, delay, period, 
                TimeUnit.MILLISECONDS); 
    } 
 
} 
 
class TimerTest01 extends TimerTask { 
    private static int i = 0; 
     
    @Override 
    public void run() { 
        System.out.println("Servlet refreshed: " + ++i + " times."); 
    } 
} 
 
class TimerTest02 extends TimerTask { 
    private static int i = 0; 
     
    @Override 
    public void run() { 
        System.out.println("Listener refreshed: " + ++i + " times."); 
    } 
} 

[html]
<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> 
 
    <filter> 
        <filter-name>HelloFilter</filter-name>