Method of adding scheduled task in Java Web project

Add scheduled tasks to Java Web programs. Here are two ways: 1 Use listener injection; 2. Use spring annotation @ scheduled injection.

The second form is recommended.

1、 Using listener injection

① : create listener class:

② : create scheduled task class:

③ : create TimerTask class:

④ : on the web XML register listener

2、 Using spring annotation injection

The framework of my project is Spring + spring MVC + mybatis

Code example:

The setting method of timing time is as follows:

Wildcard Description:

*Represents all values For example, setting "*" in the field of minutes means that it will be triggered every minute

? Indicates that no value is specified. The scenario used is that you don't need to care about the value of this field currently set.

For example, if you want to trigger an operation on the 10th of each month, but you don't care about the day of the week, you need to set the field of the week position to " The specific setting is 0 10 *?

-Represents an interval. For example, "10-12" is set on the hour, which means that it will be triggered at 10, 11 and 12 o'clock.

, indicating that multiple values are specified. For example, setting "Mon, wed, Fri" in the week field indicates that Monday, Wednesday and Friday are triggered

/Used for incremental triggering. If "5 / 15" is set above the second, it means that it will be triggered every 15 seconds from 5 seconds (5,20,35,50). Set '1 / 3' in the month field to start on the 1st of each month and trigger every three days.

L means last. In the day field setting, it represents the last day of the current month (according to the current month, if it is February, it will also be based on whether it is a profit year [leap]), and in the week field, it represents Saturday, which is equivalent to "7" or "sat". If a number is added before "L", it indicates the last of the data. For example, if the format of "6L" is set in the week field, it means "the last Friday of this month"“

W is the nearest working day (Monday to Friday) from the specified date For example, setting "15W" in the day field indicates that it is triggered on the working day closest to the 15th of each month. If the 15th happens to be Saturday, it will be triggered by the latest Friday (14th). If the 15th is weekend, it will be triggered by the latest next Monday (16th) If the 15th happens to be a working day (Monday to Friday), it will be triggered on that day. If the specified format is "1W", it indicates that it is triggered on the latest working day after the 1st of each month. If the 1st is Saturday, it will be triggered on the 3rd next Monday. (Note: only specific numbers can be set before "W", and the interval "-" is not allowed)

#Serial number (indicating the week number of each month). For example, setting "6#3" in the week field indicates the third Saturday of each month Note that if "#5" is specified, the configuration will not be triggered if there is no Saturday in the fifth week (it is most suitable for mother's day and father's day);

Tip: 'l' and 'W' can be used in combination. If "LW" is set in the day field, it means it will be triggered on the last working day of the current month; The setting of week field is case insensitive if English letters are used, that is, mon is the same as mon;

reference resources:

https://www.cnblogs.com/liaojie970/p/5913272.html

http://prisonbreak.iteye.com/blog/2247216