JAVA¶¨Ê±Ö´ÐÐÈÎÎñ
Tomcat ÏµĶ¨Ê±ÈÎÎñ
SysContextListener.java
package axtic.servlet;
import java.util.Timer;//¶¨Ê±Æ÷Àà
import axtic.bean.exportHistoryBean;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class SysContextListener implements ServletContextListener
{
private Timer timer = null;
public void contextInitialized(ServletContextEvent event)
{//ÔÚÕâÀï³õʼ»¯¼àÌýÆ÷£¬ÔÚtomcatÆô¶¯µÄʱºò¼àÌýÆ÷Æô¶¯£¬¿ÉÒÔÔÚÕâÀïʵÏÖ¶¨Ê±Æ÷¹¦ÄÜ
timer = new Timer(true);
event.getServletContext().log("¶¨Ê±Æ÷ÒÑÆô¶¯");//Ìí¼ÓÈÕÖ¾£¬¿ÉÔÚtomcatÈÕÖ¾Öв鿴µ½
timer.schedule(new exportHistoryBean(event.getServletContext()),0,5*1000);//µ÷ÓÃexportHistoryBean£¬0±íʾÈÎÎñÎÞÑÓ³Ù£¬5*1000±íʾÿ¸ô5ÃëÖ´ÐÐÈÎÎñ£¬60*60*1000±íʾһ¸öСʱ¡£
event.getServletContext().log("ÒѾÌí¼ÓÈÎÎñ");
}
public void contextDestroyed(ServletContextEvent event)
{//ÔÚÕâÀï¹Ø±Õ¼àÌýÆ÷£¬ËùÒÔÔÚÕâÀïÏú»Ù¶¨Ê±Æ÷¡£
timer.cancel();
event.getServletContext().log("¶¨Ê±Æ÷Ïú»Ù");
}
}
½ÓÏÂÀ´¿ÉÒÔ±àд×Ô¼ºµÄ¹¦ÄÜÀ࣬´ËÀàÒ»¶¨Òªextends¶¨Ê±Æ÷ÀàÖÐTimerTask
exportHistoryBean.java
package axtic.bean;
import java.util.Calendar;
import java.util.TimerTask;
import javax.servlet.ServletContext;
public class exportHistoryBean extends TimerTask
{
private static final int C_SCHEDULE_HOUR = 0;
private static boolean isRunning = false;
private ServletContext context = null;
public exportHistoryBean(ServletContext context)
{
this.context = context;
}
public void run()
{
Calendar c = Calendar.getInstance();
if(!isRunning)
{
if(C_SCHEDULE_HOUR == c.get(Calendar.HOUR_OF_DAY))
{
isRunning = true;
context.log("¿ªÊ¼Ö´ÐÐÖ¸¶¨ÈÎÎñ");
//-------------------¿ªÊ¼±£´æµ±ÈÕÀúÊ·¼Ç¼
//ÔÚÕâÀï±àд×Ô¼ºµÄ¹¦ÄÜ£¬Àý£º
//File file = new File("temp");
//file.mkdir();
//Æô¶¯tomcat£¬¿ÉÒÔ·¢ÏÖÔÚtomcat¸ùĿ¼Ï£¬»á×Ô¶¯´´½¨tempÎļþ¼Ð
//-------------------½áÊø
isRunning = false;
context.log("Ö¸¶¨ÈÎÎñÖ´ÐнáÊø");
}
else
{
context.log("ÉÏÒ»´ÎÈÎÎñÖ´Ðл¹Î´½áÊø");
}
}
}
}
ServletÕìÌýÆ÷½áºÏJava¶¨Ê±Æ÷ʵÏÖÈÎÎñ¼Æ»®µ÷¶
Ïà¹ØÎĵµ£º
Java ÖÐÀàºÍ·½·¨ÐÞÊηû
ÀàµÄÐÞÊÎ
·ÃÎÊÐÞÊηû ÐÞÊηû class ÀàÃû extends ¸¸ÀàÃû³Æ implements ½Ó¿ÚÃû³Æ£¨notes: ·ÃÎÊÐÞÊηû·ûÓëÐÞÊηûµÄλÖÿÉÒÔ»¥»»£©
·ÃÎÊÐÞÊηû
Ãû³Æ
˵Ã÷
±¸×¢
pubic
¿ÉÒÔ±»ËùÓÐÀà·ÃÎÊ(ʹÓÃ)
public Àà±ØÐ붨ÒåÔÚºÍÀàÃûÏàͬµÄͬÃûÎļþÖÐ
package
¿ÉÒÔ±»Í¬Ò»¸ö°üÖеÄÀà·ÃÎÊ(ʹÓÃ)
ĬÈϵķÃÎ ......
Person p=new Person();
ÕâÊÇʲô?µ±È»ÊÇʵÀý»¯Ò»¸ö¶ÔÏóÁË.¿ÉÊÇÕâÖÖʵÀý»¯¶ÔÏóµÄ·½·¨´æÔÚÒ»¸öÎÊÌâ,ÄǾÍÊDZØÐëÒªÖªµÀÀàÃû²Å¿ÉÒÔʵÀý»¯ËüµÄ¶ÔÏó,ÕâÑùÎÒÃÇÔÚÓ¦Ó÷½Ãæ¾Í»áÊܵ½ÏÞÖÆ.ÄÇôÓÐûÓÐÕâÑùÒ»ÖÖ·½Ê½,ÈÃÎÒÃDz»ÖªµÀÕâ¸öÀàµÄÀàÃû¾Í¿ÉÒÔʵÀý»¯ËüµÄ¶ÔÏóÄØ?Thank Goodness!ÐÒ¿÷ÎÒÃÇÓõÄÊÇjava, java¾ÍÌṩÁËÕâÑùµÄ»úÖÆ.
1).ja ......
(1) transient:
Èç¹ûÓÃtransientÉùÃ÷Ò»¸öʵÀý±äÁ¿£¬µ±¶ÔÏó´æ´¢Ê±£¬ËüµÄÖµ²»ÐèҪά³Ö¡£ÀýÈ磺
class T
{
transient int a; //²»ÐèҪά³Ö
int b; //ÐèҪά³Ö
} //ÕâÀÈç¹ûTÀàµÄÒ»¸ö¶ÔÏóдÈëÒ»¸ö³Ö¾ÃµÄ´æ´¢ÇøÓò£¬aµ ......
JDK1.4ÖÐ
Map map = new HashMap();
Iterator it = map.entrySet().iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
Object key = entry.getKey();
Object value = entry.getValue();
}
JDK1.5ÖÐ,Ó¦ÓÃÐÂÌØÐÔFor-EachÑ»·
Map m = new HashMap(); ......
ʹÓà Java ¶Ô Linux ÏÂÎļþ±àÂë¸ñʽ½øÐÐÅúÁ¿×ª»»
²âÊÔʹÓÃ˵Ã÷£º
1¡£½« ×Ö·û¼¯±àÂë¸ñʽΪ GB2312 µÄÎļþ test0.java£¬test1.java£¬test2.java ·ÅÔÚ /home/defonds/tmp/test Ŀ¼Ï£¨test0.java£¬test1.java£¬test2.java ×÷Õß¿ÉÒÔ ......