Commit 1501514857255d2ffc3ac58bad671b3d88218db6
1 parent
7ae97ee4
2022年5月27日15:07:24 cron表达式执行时间计算
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19 additions
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17 deletions
src/main/java/cn/fw/freya/utils/CronCheckUtil.java
1 | 1 | package cn.fw.freya.utils; |
2 | 2 | |
3 | -import org.springframework.scheduling.support.CronSequenceGenerator; | |
3 | +import org.springframework.scheduling.support.CronExpression; | |
4 | 4 | |
5 | -import java.text.SimpleDateFormat; | |
6 | -import java.util.*; | |
5 | +import java.time.LocalDateTime; | |
6 | +import java.time.format.DateTimeFormatter; | |
7 | +import java.util.ArrayList; | |
8 | +import java.util.List; | |
9 | +import java.util.Objects; | |
7 | 10 | |
8 | 11 | /** |
9 | 12 | * @author wmy3969 |
10 | 13 | * @version 1.0 |
11 | 14 | * @date 2021/10/05 17:30 |
12 | - * @Description cron表达式校验工具类 | |
15 | + * @Description cron表达式执行时间校验工具类 | |
13 | 16 | */ |
14 | 17 | public class CronCheckUtil { |
15 | - | |
16 | 18 | /** |
17 | 19 | * 根据cron表达式, 获取在某个时间点之后的counter次执行时间列表 |
18 | 20 | * |
... | ... | @@ -21,15 +23,15 @@ public class CronCheckUtil { |
21 | 23 | * @param counter 执行次数 |
22 | 24 | * @return |
23 | 25 | */ |
24 | - public static List<Date> getRuntimeList(String cronExpression, Date startDate, int counter) { | |
25 | - List<Date> timeList = new ArrayList(counter); | |
26 | - Calendar calendar = new GregorianCalendar(); | |
27 | - TimeZone timeZone = calendar.getTimeZone(); | |
28 | - CronSequenceGenerator cronSequenceGenerator = new CronSequenceGenerator(cronExpression, timeZone); | |
29 | - Date next = cronSequenceGenerator.next(startDate); | |
30 | - for (int i = 0; i < counter; i++) { | |
31 | - timeList.add(next); | |
32 | - next = cronSequenceGenerator.next(next); | |
26 | + public static List<LocalDateTime> getRuntimeList(String cronExpression, LocalDateTime startDate, int counter) { | |
27 | + final int cnt = Math.max(counter, 1); | |
28 | + ArrayList<LocalDateTime> timeList = new ArrayList<LocalDateTime>(cnt); | |
29 | + CronExpression expression = CronExpression.parse(cronExpression); | |
30 | + LocalDateTime nextTime = Objects.isNull(startDate) ? LocalDateTime.now() : startDate; | |
31 | + for (int i = 0; i < cnt; i++) { | |
32 | + assert nextTime != null; | |
33 | + nextTime = expression.next(nextTime); | |
34 | + timeList.add(nextTime); | |
33 | 35 | } |
34 | 36 | return timeList; |
35 | 37 | } |
... | ... | @@ -40,8 +42,8 @@ public class CronCheckUtil { |
40 | 42 | * @param args |
41 | 43 | */ |
42 | 44 | public static void main(String[] args) { |
43 | - final List<Date> runtimeList = CronCheckUtil.getRuntimeList("0 0/2 * * * ?", new Date(), 300); | |
44 | - final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss mmm"); | |
45 | - runtimeList.forEach(item -> System.out.println(sdf.format(item))); | |
45 | + DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); | |
46 | + final List<LocalDateTime> runtimeList = CronCheckUtil.getRuntimeList("0 0/2 * * * ?", LocalDateTime.now(), 10); | |
47 | + runtimeList.forEach(item -> System.out.println(dateTimeFormatter.format(item))); | |
46 | 48 | } |
47 | 49 | } | ... | ... |