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最新评论
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lbs1026:
您好,卸载后怎么再装上去呢?
java中dll文件的加载和卸载。 -
mp19901204:
请教下,能通过js播放指定的影片吗。不刷新网页,用js直接调用 ...
Flv播放器 Vcastr3.0的用法参考 -
wiflish:
hanmiao 写道试了第壹個,好用。
使maven2在下载依赖包的同时下载其源代码包。 -
hanmiao:
试了第壹個,好用。
使maven2在下载依赖包的同时下载其源代码包。 -
chuanwang66:
请问Heritrix 3.1.0 你是怎么配置进Eclipse ...
Heritrix3.1.0RC1使用Cookie不能自动登录问题的一个解决办法
http://www.opensymphony.com/quartz/wikidocs/CronTriggers Tutorial.html
Quartz - Quartz 1 - CronTriggers Tutorial
Some of the content in this tutorial is taken from the Quartz 1.4.2 javadocs for CronTrigger . |
Introduction
cron is a UNIX tool that has been around for a long time, so its scheduling capabilities are powerful and proven. The CronTrigger class is based on the scheduling capabilities of cron.
CronTrigger uses "cron expressions", which are able to create firing schedules such as: "At 8:00am every Monday through Friday" or "At 1:30am every last Friday of the month".
Cron expressions are powerful, but can be pretty confusing. This tutorial aims to take some of the mystery out of creating a cron expression, giving users a resource which they can visit before having to ask in a forum or mailing list.
Format
A cron expression is a string comprised of 6 or 7 fields separated by white space. Fields can contain any of the allowed values, along with various combinations of the allowed special characters for that field. The fields are as follows:
Seconds | YES | 0-59 | , - * / |
Minutes | YES | 0-59 | , - * / |
Hours | YES | 0-23 | , - * / |
Day of month | YES | 1-31 | , - * ? / L W |
Month | YES | 1-12 or JAN-DEC | , - * / |
Day of week | YES | 1-7 or SUN-SAT | , - * ? / L # |
Year | NO | empty, 1970-2099 | , - * / |
So cron expressions can be as simple as this: * * * * ? *
or more complex, like this: 0 0/5 14,18,3-39,52 ? JAN,MAR,SEP MON-FRI 2002-2010
Special characters
- * ("all values" ) - used to select all values within a field. For example, "*" in the minute field means "every minute" .
- ? ("no specific value" ) - useful when you need to specify something in one of the two fields in which the character is allowed, but not the other. For example, if I want my trigger to fire on a particular day of the month (say, the 10th), but don't care what day of the week that happens to be, I would put "10" in the day-of-month field, and "?" in the day-of-week field. See the examples below for clarification.
- - - used to specify ranges. For example, "10-12" in the hour field means "the hours 10, 11 and 12" .
- , - used to specify additional values. For example, "MON,WED,FRI" in the day-of-week field means "the days Monday, Wednesday, and Friday" .
- / - used to specify increments. For example, "0/15" in the seconds field means "the seconds 0, 15, 30, and 45" . And "5/15" in the seconds field means "the seconds 5, 20, 35, and 50" . You can also specify '/' after the '' character - in this case ' ' is equivalent to having '0' before the '/'. '1/3' in the day-of-month field means "fire every 3 days starting on the first day of the month" .
- L ("last" ) - has different meaning in each of the two fields in which it is allowed. For example, the value "L" in the day-of-month field means "the last day of the month" - day 31 for January, day 28 for February on non-leap years. If used in the day-of-week field by itself, it simply means "7" or "SAT". But if used in the day-of-week field after another value, it means "the last xxx day of the month" - for example "6L" means "the last friday of the month" . When using the 'L' option, it is important not to specify lists, or ranges of values, as you'll get confusing results.
-
W
("weekday"
) - used to specify the
weekday (Monday-Friday) nearest the given day. As an example, if you
were to specify "15W" as the value for the day-of-month field, the
meaning is: "the nearest weekday to the 15th of the month"
.
So if the 15th is a Saturday, the trigger will fire on Friday the 14th.
If the 15th is a Sunday, the trigger will fire on Monday the 16th. If
the 15th is a Tuesday, then it will fire on Tuesday the 15th. However
if you specify "1W" as the value for day-of-month, and the 1st is a
Saturday, the trigger will fire on Monday the 3rd, as it will not
'jump' over the boundary of a month's days. The 'W' character can only
be specified when the day-of-month is a single day, not a range or list
of days.
The 'L' and 'W' characters can also be combined in the day-of-month field to yield 'LW', which translates to "last weekday of the month" .
-
#
- used to specify "the nth" XXX day of the month. For example, the value of "6#3" in the day-of-week field means "the third Friday of the month"
(day 6 = Friday and "#3" = the 3rd one in the month). Other examples:
"2#1" = the first Monday of the month and "4#5" = the fifth Wednesday
of the month. Note that if you specify "#5" and there is not 5 of the
given day-of-week in the month, then no firing will occur that month.
The legal characters and the names of months and days of the week are not case sensitive. MON is the same as mon .
Examples
Here are some full examples:
0 0 12 * * ? | Fire at 12pm (noon) every day |
0 15 10 ? * * | Fire at 10:15am every day |
0 15 10 * * ? | Fire at 10:15am every day |
0 15 10 * * ? * | Fire at 10:15am every day |
0 15 10 * * ? 2005 | Fire at 10:15am every day during the year 2005 |
0 * 14 * * ? | Fire every minute starting at 2pm and ending at 2:59pm, every day |
0 0/5 14 * * ? | Fire every 5 minutes starting at 2pm and ending at 2:55pm, every day |
0 0/5 14,18 * * ? | Fire every 5 minutes starting at 2pm and ending at 2:55pm, AND fire every 5 minutes starting at 6pm and ending at 6:55pm, every day |
0 0-5 14 * * ? | Fire every minute starting at 2pm and ending at 2:05pm, every day |
0 10,44 14 ? 3 WED | Fire at 2:10pm and at 2:44pm every Wednesday in the month of March. |
0 15 10 ? * MON-FRI | Fire at 10:15am every Monday, Tuesday, Wednesday, Thursday and Friday |
0 15 10 15 * ? | Fire at 10:15am on the 15th day of every month |
0 15 10 L * ? | Fire at 10:15am on the last day of every month |
0 15 10 ? * 6L | Fire at 10:15am on the last Friday of every month |
0 15 10 ? * 6L | Fire at 10:15am on the last Friday of every month |
0 15 10 ? * 6L 2002-2005 | Fire at 10:15am on every last friday of every month during the years 2002, 2003, 2004 and 2005 |
0 15 10 ? * 6#3 | Fire at 10:15am on the third Friday of every month |
0 0 12 1/5 * ? | Fire at 12pm (noon) every 5 days every month, starting on the first day of the month. |
0 11 11 11 11 ? | Fire every November 11th at 11:11am. |
Pay attention to the effects of '?' and '*' in the day-of-week and day-of-month fields! |
Notes
- Support for specifying both a day-of-week and a day-of-month value is not complete (you must currently use the '?' character in one of these fields).
- Be careful when setting fire times between mid-night and 1:00 AM - "daylight savings" can cause a skip or a repeat depending on whether the time moves back or jumps forward.
发表评论
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《架构之美》笔记
2013-12-04 21:02 0美丽架构的特性: 1、概念完整性(来自于处理问题的一致性) ... -
【转】生产环境下JAVA进程高CPU占用故障排查
2013-11-01 16:36 1432转自: http://blog.chinaunix.net/ ... -
在maven生成eclipse文件时,使项目支持wtp的方式
2011-12-18 00:37 1230使项目能支持wtp: maven eclipse:ec ... -
解决Maven编译出现警告时,就提示编译失败的问题
2011-08-18 19:42 2099解决Maven编译出现警告时,就提示编译失败的问题 原因:m ... -
进入Glassfish3管理控制台太慢的解决办法
2011-07-07 14:53 1684解决办法:关闭Glassfish的网络链接。 配置方法 ... -
OSGi4.2规范的Bundle Manifest Headers列表
2010-01-22 17:40 2485OSGi4.2规范的Bundle Manifest ... -
VisualVM远程监控
2009-11-18 17:28 2623VisualVM是集成了多个JDK命令工具的一个可视化 ... -
maven-war插件打包war时,过滤掉指定文件或目录的配置方法
2009-09-09 11:53 17129<plugin> <artifac ... -
Spring-Security 2 中从数据库中读取权限的实现方式
2009-07-22 21:29 3549security的配置片段: < ... -
关于Bad version number in .class file错误
2009-04-01 10:54 1100出现Bad version number in .class ... -
maven报错。
2009-03-22 00:07 1628错误信息:[INFO] Required goal not f ... -
java处理视频
2009-01-12 22:42 3868目前绝大多数视频网站使用的格式是flv。格式可以任意位置播放, ... -
Xdoclet的标签及用法
2006-05-11 11:43 866参照链接: Xdoclet的标签及用法 -
原创:eclipse反编译插件Jadclipse介绍
2006-05-16 15:23 901jadclips插件网站:http://jadclipse.s ... -
ant中宏定义例子
2006-05-18 16:47 1597一个ant中用于编译的宏定义例子: 1 ... -
Google Web Toolkit
2006-05-22 14:12 839Google Web Toolkit (GWT) is a J ... -
[转]java基本类装入异常
2006-05-24 16:24 1133原文链接:http://www-128.ibm.co ... -
安装和卸载Mysql的windows系统服务
2006-05-26 15:20 1154安装mysql的windows系统服务: ${mysql.h ... -
通过java获取系统环境变量
2006-07-03 17:11 3663代码如下: 1 public static ... -
jar命令中的MANIFEST文件属性列表
2006-07-05 10:09 1710官方链接:JAR File SpecificationMANI ...
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