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Spring Cron パース器

解析 Spring @Scheduled 6位 cron 表达式，区别于Standard Unix 5-field格式
Cron Expression (6 fields)
秒 (0-59)分 (0-59)時 (0-23)日 (1-31)月 (1-12)週 (0-7)
Spring Cron vs 标准 Cron
Spring 6位: Sec Min Hour Day Month Week  —  First field is秒, no year field
Standard Unix 5-field: Min Hour Day Month Week  —  No seconds field
Spring 対応 ?(day/week pick one), L(last day), #(Nth weekday) etc.
符号含义サンプル
*Any value* * * * * * 毎秒
?Not specified (day/week)0 0 0 1 * ? 1st of month
-范围0 0 9-17 * * * 9-17点
,列举0 0 9,12,18 * * *
/步长0 */15 * * * * Every 15 min
LLast (day/week)0 0 0 L * * 毎月Last 日
WNearest weekday0 0 0 15W * * Nearest weekday to 15th
#Nth weekday0 0 0 ? * 5#3 3rd Friday