本文介绍了根据格式验证字符串日期为有效日期的最佳方法是什么?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

最近开始使用WEB UI。并遇到了日期字符串
解析/验证的问题。 dd-mm-yyyy
我发现的一些方法是:

Started working with WEB UI recently. And encountered a problem of date stringparsing/validation. "dd-mm-yyyy"Some approaches I found are:


  1. 匹配 - 不完整验证,不灵活。

  1. Matching - not complete validation, not flexible.

(19 | 20)\\\ [ - /.](0[1-9]|1[012] )[ - /。](0 [1-9] | [12] [0-9] | 3 [01])

有一篇文章,其中有人建议使用可能的日期字符串预初始化Set - 快速,有效,但也不灵活且耗费内存

There was a post where guy suggest to preinitialize Set with possible date string - fast, valid, but also not flexible and memory consuming

是否有更容易的东西,可能在公共库中可用?

Is there something easier, maybe available in public libs ?

请不要建议SimpleDateFormat :)

UPDATE
for java 8正确答案

推荐答案

如果您正在使用java 8然后是什么你在找。 javadoc的链接还包含示例代码和许多预定义格式。除此之外,您还可以定义自己的。

If you are using java 8 then DateTimeFormatter is what you are looking for. The link to javadoc also contains sample code and a number of predefined formats. Besides you can also define your own.


以下是一些代码,来自同一链接的示例:


Here is some code, an example from the same link:

LocalDate date = LocalDate.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy MM dd");
String text = date.format(formatter);
LocalDate parsedDate = LocalDate.parse(text, formatter);

此外,问题有一些很棒的答案。

Also, this How to parse/format dates with LocalDateTime? (Java 8) question has got some fantastic answers.



编辑:感谢Basil Bourque 有关项目的更新,以防万一需要使用与java提供的功能几乎相同的功能8在某些旧版本的java中。


Thanks Basil Bourque for the updates about ThreeTen-Backport project in case one needs to use almost the same features as provided by java 8 in some older versions of java.

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09-03 05:07