Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

JAVA¶¨Ê±Ö´ÐÐÈÎÎñµÄÈýÖÖ·½·¨

JAVA¶¨Ê±Ö´ÐÐÈÎÎñµÄÈýÖÖ·½·¨ 
1) java.util.Timer
Õâ¸ö·½·¨Ó¦¸ÃÊÇ×î³£Óõ쬲»¹ýÕâ¸ö·½·¨ÐèÒªÊÖ¹¤Æô¶¯ÄãµÄÈÎÎñ£º
Timer timer=new Timer();
timer.schedule(new ListByDayTimerTask(),10000,86400000);
ÕâÀïµÄListByDayTimerTaskÀà±ØÐëextends TimerTaskÀïÃæµÄrun()·½·¨¡£
2) ServletContextListener
Õâ¸ö·½·¨ÔÚwebÈÝÆ÷»·¾³±È½Ï·½±ã£¬ÕâÑù£¬ÔÚweb serverÆô¶¯ºó¾Í¿ÉÒÔ
×Ô¶¯ÔËÐиÃÈÎÎñ£¬²»ÐèÒªÊÖ¹¤²Ù×÷¡£
½«ListByDayListener implements ServletContextListener½Ó¿Ú£¬ÔÚ
contextInitialized·½·¨ÖмÓÈëÆô¶¯TimerµÄ´úÂ룬ÔÚcontextDestroyed
·½·¨ÖмÓÈëcancel¸ÃTimerµÄ´úÂ룻ȻºóÔÚweb.xmlÖУ¬¼ÓÈëlistener:
< listener>
< listener-class>com.qq.customer.ListByDayListener< /listener-class>
< /listener>
3)org.springframework.scheduling.timer.ScheduledTimerTask
Èç¹ûÄãÓÃspring£¬ÄÇôÄã²»ÐèҪдTimerÀàÁË£¬ÔÚschedulingContext-timer
.xmlÖмÓÈëÏÂÃæµÄÄÚÈݾͿÉÒÔÁË£º
< ?xml version="1.0" encoding="UTF-8"?>
< !DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
< beans>
< bean id="timer" class="org.springframework.scheduling.timer.TimerFactoryBean">
< property name="scheduledTimerTasks">
< list>
< ref local="MyTimeTask1"/>
< /list>
< /property>
< /bean>
< bean id="MyTimeTask" class="com.qq.timer.ListByDayTimerTask"/>
< bean id="MyTimeTask1" class="org.springframework.scheduling.timer.ScheduledTimerTask">
< property name="timerTask">
< ref bean="MyTimeTask"/>
< /property>
< property name="delay">
< value>10000< /value>
< /property>
< property name="period">
< value>86400000< /value>
< /property>
< /bean>
< /beans> 


Ïà¹ØÎĵµ£º

ÈçºÎÌá¸ß×Ô¼ºµÄJava±à³Ìˮƽ

       1.
ÔúʵµÄ»ù´¡¡£Êý¾Ý½á¹¹¡¢ÀëÉ¢Êýѧ¡¢±àÒëÔ­Àí£¬ÕâЩÊÇËùÓмÆËã»ú¿ÆÑ§µÄ»ù´¡£¬Èç¹û²»ÕÆÎÕËûÃÇ£¬ºÜÄÑд³ö¸ßˮƽµÄ³ÌÐò¡£¾ÝÎҵĹ۲죬ѧ¼ÆËã»úרҵµÄÈ˱ÈѧÆäËû
רҵµÄÈ˸üÄÜд³ö¸ßÖÊÁ¿µÄÈí¼þ¡£³ÌÐòÈËÈ˶¼»áд£¬µ«µ±Äã·¢ÏÖдµ½Ò»¶¨³Ì¶ÈºÜÄÑÔÙÌá¸ßµÄʱºò£¬¾ÍÓ¦¸ÃÏëÏëÊDz»ÊÇÒª»Ø¹ýÍ·À´ ......

Java×¢Ê͹淶

¶¨ÒåÕâ¸ö¹æ·¶µÄÄ¿µÄÊÇÈÃÏîÄ¿ÖÐËùÓеÄÎĵµ¶¼¿´ÆðÀ´ÏñÒ»¸öÈËдµÄ£¬Ôö¼Ó¿É¶ÁÐÔ£¬¼õÉÙÏîÄ¿×éÖÐÒòΪ»»È˶ø´øÀ´µÄËðʧ¡££¨ÕâЩ¹æ·¶²¢²»ÊÇÒ»¶¨Òª¾ø¶Ô×ñÊØ£¬µ«ÊÇÒ»¶¨ÒªÈóÌÐòÓÐÁ¼ºÃµÄ¿É¶ÁÐÔ£©¡£
Java µÄÓï·¨Óë C++ ¼°ÎªÏàËÆ£¬ÄÇô£¬ÄãÖªµÀ Java µÄ×¢ÊÍÓм¸ÖÖÂð£¿ÊÇÁ½ÖÖ£¿ ¡¡¡¡
// ×¢ÊÍÒ»ÐС¡¡¡
/* ...... */ ×¢ÊÍÈô¸ÉÐÐ
²»ÍêÈ ......

Java²Ù×÷ÎļþÒ»£¨pdf£©

Ò»¡¢Ð´pdf
ÐèÒª°ü£ºiText-2.1.0.jar
ÖÐÎÄ´¦Àí£ºiTextAsian.jar
1¡¢HelloWorldÀý×Ó
package com.my.file.pdf;
import java.io.FileOutputStream;
import java.io.IOException;
import com.lowagie.text.*;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfWriter;
public class HelloWorld ......

final ÔÚjavaÖеÄ×¢Òâµã

×¢ÒâÊÂÏîÂýÂý»ýÀÛ
final À಻¿É±»¼Ì³Ð£¬Ò²²»ÄÜÓÐ×ÓÀà¡£
final class Book{}
//class ComBook extends Book{}     Õ⽫±àÒëʧ°Ü£¬ÒòΪBookÀ಻¿É±»¼Ì³Ð¡£
final·½·¨²»¿É±»¸Äд
class Book{
          final void show£¨£©{System.out.println("Book ......

javaÖеõ½µ±Ç°Â·¾¶

¹éÄÉÒ»Ð©ÍøÉÏÈ¡JAVA·¾¶µÄ·½·¨£º
×¢Ã÷£ºÈç¹û´ÓANTÆô¶¯³ÌÐò£¬this.getClass().getResource("")È¡³öÀ´µÄ±È½Ï¹Ö£¬Ö±½ÓÓÃJAVAÃüÁîÐе÷ÊԾͿɳÉ
¹¦¡£
µÃµ½classpathºÍµ±Ç°ÀàµÄ¾ø¶Ô·¾¶µÄһЩ·½·¨
»ñµÃCLASSPATHÖ®Íâ·¾¶µÄ·½·¨£º
URL base = this.getClass£¨£©.getResource£¨""£©£»
//ÏÈ»ñµÃ±¾ÀàµÄËùÔ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ