Convert Json date to java calendar

问题

I have the following value /Date(1234043600000)/ in string type and I need to convert it to java calendar type without a success,I have tried to use the following post and create date and than do something like the post

How do I format a Microsoft JSON date?

Date date = new Date(parseInt(jsonDate.substr(6))); 

and than do someting like

Calendar cal = Calendar.getInstance();
cal.setTime(date);

I got error in the first line since in the word date i have line in the middle and substr(6) have error (The method substr(int) is undefined for the type String) ,how should I continue .

Thanks!

回答1:

This should work in Java

Date date = new Date(Long.parseLong(jsonDate.replaceAll(".*?(\\d+).*", "$1")));

the problem with your example is that it's only good for javascript

回答2:

The easiest way for you to get the number is to use

Long dateInMiliSeconds = new Scanner(jsonDate).nextLong();
Date date = new Date(dateInMiliSeconds);
Calendar cal = Calendar.getInstance();
cal.setTime(date);

Also the reason for your compilation error is that the method to get a sub string in Java String class is called subString not substr.

Although using the scanner is cleaner if you don't know much regex Evgeniy's answer may be better performance wise. I have no idea about the two approaches performance differences.

来源：https://stackoverflow.com/questions/18121082/convert-json-date-to-java-calendar