Java calculates the number of days before two dates (excluding holidays and weekends)

As mentioned in the question, calculate the number of days before two dates, excluding holidays and weekends. The type of days here is double, because this function is used to calculate the number of days of leave, and the number of days of leave in the morning is 0.5 days.

What's not enough is that you have to query the database every day, which feels like a waste of time.

principle:

　　1. Holidays are stored in the database

Implementation steps:

　　1. Cycle each date

　　2. Judge whether each date is a holiday or weekend

　　3. Days + 1 if not holidays and weekends

code:

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