是否有一个Java库将描述时间度量的字符串（例如“1d 1m 1s”）转换为毫秒？(Is there a java library that converts strings describing m

是否有一个Java库将描述时间度量的字符串（例如“1d 1m 1s”）转换为毫秒？(Is there a java library that converts strings describing measures of time (e.g. “1d 1m 1s”) to milliseconds?)

在JIRA中设置问题估算值时，您可以输入一个字符串，如"1d 2h 30m" ，JIRA会将此（我假设）转换为相应的毫秒数。

有没有可用的Java库来做到这一点？

我使用的是一个Spring托管bean，它接受一个属性，指明目录应该被清除的频率，并且我希望允许配置采用人类可读的字符串，而不是明确的毫秒数。

或者，如果我没有想到更好的方法，我很乐意听到它。

When setting issue estimates in JIRA, you can enter a string like "1d 2h 30m" and JIRA will translate this (I'm assuming) into a corresponding number of milliseconds.

Is there an available Java library that does this?

I'm using a Spring managed bean that takes a property indicating how often a directory ought to be purged, and I'd like to allow the configuration to take a human-readable string rather than an explicit number of milliseconds.

Alternatively, if there's a better approach I'm not thinking of, I'd love to hear it.

最满意答案

解析器不太复杂：

public static long parse(String input) { long result = 0; String number = ""; for (int i = 0; i < input.length(); i++) { char c = input.charAt(i); if (Character.isDigit(c)) { number += c; } else if (Character.isLetter(c) && !number.isEmpty()) { result += convert(Integer.parseInt(number), c); number = ""; } } return result; } private static long convert(int value, char unit) { switch(unit) { case 'd' : return value * 1000*60*60*24; case 'h' : return value * 1000*60*60; case 'm' : return value * 1000*60; case 's' : return value * 1000; } return 0; }

该代码具有相当的容错能力，它只是忽略了它无法解码的任何东西（并且忽略了任何空白区域，所以它接受“1d 1s”，“1s 1d”，“1d20m300s”等等）。

The parser is not too complex:

public static long parse(String input) { long result = 0; String number = ""; for (int i = 0; i < input.length(); i++) { char c = input.charAt(i); if (Character.isDigit(c)) { number += c; } else if (Character.isLetter(c) && !number.isEmpty()) { result += convert(Integer.parseInt(number), c); number = ""; } } return result; } private static long convert(int value, char unit) { switch(unit) { case 'd' : return value * 1000*60*60*24; case 'h' : return value * 1000*60*60; case 'm' : return value * 1000*60; case 's' : return value * 1000; } return 0; }

The code is pretty fault tolerant, it just ignores almost anything it can't decode (and it ignores any whitspace, so it accepts "1d 1s", "1s 1d", "1d20m300s" and so on).