@ scheduled cron expression in quartz

Cron An expression is a string , String to 5 or 6 Space between , It is divided into 6 or 7 Domains , Each domain represents a meaning ,Cron There are two grammatical formats as follows ： 

1.Seconds Minutes Hours DayofMonth Month DayofWeek Year
2.Seconds Minutes Hours DayofMonth Month DayofWeek

The characters that can appear in each field are as follows ： 
Seconds: Can appear ", - * /" Four characters , The valid range is 0-59 The integer of  
Minutes:  Can appear ", - * /" Four characters , The valid range is 0-59 The integer of  
Hours:  Can appear ", - * /" Four characters , The valid range is 0-23 The integer of  
DayofMonth : Can appear ", - * / ? L W C" Eight characters , The valid range is 0-31 The integer of  
Month:  Can appear ", - * /" Four characters , The valid range is 1-12 An integer of or JAN-DEc 
DayofWeek:  Can appear ", - * / ? L C #" Four characters , The valid range is 1-7 An integer of or SUN-SAT Two ranges .1 Sunday ,2 For Monday , By analogy  
Year:  Can appear ", - * /" Four characters , The valid range is 1970-2099 year

Every field uses numbers , But the following special characters can also appear , They mean ： 
(1) *： Represents any value that matches the field , If be in, Minutes Domain use *, It means that the event will be triggered every minute .

(2) ?： Can only be used in DayofMonth and DayofWeek Two domain . It also matches any value of the field , But it doesn't . because DayofMonth and DayofWeek Will affect each other . For example, I want to be in the 20 Daily trigger dispatch , No matter 20 What day is the day of the week , You can only write it as follows ： 13 13 15 20 * ?, The last one can only use ？, They can't be used *, If you use * No matter what day of the week it will trigger , It's not like that . 

(3) -： Scope of representation , For example, in Minutes Domain use 5-20, From 5 be assigned to 20 Trigger every minute  

(4) /： Indicates that the start time starts to trigger , Then trigger every fixed time , For example, in Minutes Domain use 5/20, Means that the 5 Minutes to trigger , and 25,45 Wait for each trigger . 

(5) ,： Indicates that enumeration values are listed . for example ： stay Minutes Domain use 5,20, It means in 5 and 20 Minutes per minute . 

(6) L： Said the last , Can only appear in DayofWeek and DayofMonth Domain , If in DayofWeek Domain use 5L, Means trigger on the last Thursday .

(7) W： Means effective working day ( Monday to Friday ), Can only appear in DayofMonth Domain , The system will trigger the event... On the most effective working day from the specified date . for example ： stay DayofMonth Use 5W, If 5 It's Saturday , On the most recent working day ： Friday , namely 4 Day trigger . If 5 Sunday is Sunday , It's in 6 Japan ( Monday ) Trigger ; If 5 The day is on Monday By the middle of Friday , It's in 5 Day trigger . Another point ,W Our latest search will not cross the month .

(8) LW： These two characters can be used together , On the last working day of a month , The last Friday . 

(9) #： Used to determine the week ordinal of each month , Can only appear in DayofMonth Domain . For example, in 4#2, The second Wednesday of a month . 

Take a few examples : 

every other 5 Once per second ："*/5 * * * * ?"

every other 1 Once per minute ："0 */1 * * * ?"

Every day 23 Click to execute once ："0 0 23 * * ?"

Every morning 1 Click to execute once ："0 0 1 * * ?"

monthly 1 No. In the morning 1 Click to execute once ："0 0 1 1 * ?"

Last day of each month 23 Click to execute once ："0 0 23 L * ?"

Every Sunday morning 1 Do it once ："0 0 1 ? * L"

stay 26 branch 、29 branch 、33 Execute once ："0 26,29,33 * * * ?"

Daily 0 spot 、13 spot 、18 spot 、21 Do it all once ："0 0 0,13,18,21 * * ?"

In the month of 1 Early in the morning 2 Point scheduling tasks ："0 0 2 1 * ? *"

From Monday to Friday every morning 10：15 Perform operation ："0 15 10 ? * MON-FRI" 

Express 2002-2006 Last Friday morning of each month of the year 10:15 perform ："0 15 10 ? 6L 2002-2006"