如何在 Java 中健全地检查日期

2022-01-11 00:00:00 validation date calendar java

我觉得奇怪的是，在 Java 中创建 Date 对象的最明显方法已被弃用，并且似乎已被不那么明显的宽松日历取代".

I find it curious that the most obvious way to create Date objects in Java has been deprecated and appears to have been "substituted" with a not so obvious to use lenient calendar.

您如何检查以日、月和年的组合形式给出的日期是否有效?

How do you check that a date, given as a combination of day, month, and year, is a valid date?

例如，2008-02-31(如 yyyy-mm-dd)将是一个无效的日期.

For instance, 2008-02-31 (as in yyyy-mm-dd) would be an invalid date.

推荐答案

目前的方式是使用日历类.它有 setLenient 方法将验证日期并抛出异常，如果它超出了您的示例中的范围.

The current way is to use the calendar class. It has the setLenient method that will validate the date and throw and exception if it is out of range as in your example.

忘记添加:如果您获得日历实例并使用您的日期设置时间，这就是您获得验证的方式.

Forgot to add: If you get a calendar instance and set the time using your date, this is how you get the validation.

Calendar cal = Calendar.getInstance();
cal.setLenient(false);
cal.setTime(yourDate);
try {
    cal.getTime();
}
catch (Exception e) {
  System.out.println("Invalid date");
}

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