Current timestamp as filename in Java

问题

I want to name new files created by my Java application with the current timestamp.

I need help with this. How do I name the new files created with the current timestamp? Which classes should I include?

回答1:

No need to get too complicated, try this one liner:

String fileName = new SimpleDateFormat("yyyyMMddHHmm'.txt'").format(new Date());

回答2:

try this one

String fileSuffix = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());

回答3:

You can get the current timestamp appended with a file extension in the following way:

String fileName = new Date().getTime() + ".txt";

回答4:

Use SimpleDateFormat as aix suggested to format the current time into a string. You should use a format that does not include / characters etc. I would suggest something like yyyyMMddhhmm

回答5:

You can use DateTime

import org.joda.time.DateTime

Option 1 : with yyyyMMddHHmmss

DateTime.now().toString("yyyyMMddHHmmss")

Will give 20190205214430

Option 2 : yyyy-dd-M--HH-mm-ss

   DateTime.now().toString("yyyy-dd-M--HH-mm-ss")

will give 2019-05-2--21-43-32

回答6:

Date, SimpleDateFormat and whatever classes are required on the I/O side of things (there are many possibilities).

来源：https://stackoverflow.com/questions/7488559/current-timestamp-as-filename-in-java