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ÏÂÃæ¾ÍServletÕìÌýÆ÷½áºÏJava¶¨Ê±Æ÷À´½²ÊöÕû¸öʵÏÖ¹ý³Ì¡£ÒªÔËÓÃServletÕìÌýÆ÷ÐèҪʵÏÖ javax.servlet.ServletContextListener½Ó¿Ú£¬Í¬Ê±ÊµÏÖËüµÄcontextInitialized (ServletContextEvent event)ºÍcontextDestroyed(ServletContextEvent event)Á½¸ö½Ó¿Úº¯Êý¡£¿¼ÂǶ¨Ê±Æ÷Óиö½¨Á¢ºÍÏú»ÙµÄ¹ý³Ì£¬¿´ÁËÇ°ÃæÁ½¸ö½Ó¿Úº¯Êý£¬¾Í²»ÈÝÖÃÒɵİѽ¨Á¢µÄ¹ý³ÌÖÃÈë contextInitialized£¬°ÑÏú»ÙµÄ¹ý³ÌÖÃÈëcontextDestroyedÁË¡£ 
ÎÒ°ÑServletContextListenerµÄʵÏÖÀàÈ¡ÃûΪContextListener,ÔÚÆäÄÚÌí¼ÓÒ»¸ö¶¨Ê±Æ÷£¬Ê¾Àý´úÂëÈçÏÂËùʾ£º 
import java.util.Timer; 
import javax.servlet.ServletContextEvent; 
import javax.servlet.ServletContextListener; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.http.HttpServlet; 
public class ContextListener 
extends HttpServlet 
implements ServletContextListener { 
public ContextListener() { 

private java.util.Timer timer = null; 
public void contextInitialized(ServletContextEvent event) { 
timer = new java.util.Timer(true); 
event.getServletContext().log("¶¨Ê±Æ÷ÒÑÆô¶¯"); 
timer.schedule(new MyTask(event.getServletContext()), 0, 60*60*1000); 
event.getServletContext().log("ÒѾ­Ìí¼ÓÈÎÎñµ÷¶È±í"); 

public void contextDestroyed(ServletContextEvent event) { 
timer.cancel();&n


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