Remove filename extension in Java

java file-extension
hpique picture hpique · Aug 10, 2010 · Viewed 27.6k times · Source

(Without including any external libraries.)

What's the most efficient way to remove the extension of a filename in Java, without assuming anything of the filename?

Some examples and expected results:

  • folder > folder
  • hello.txt > hello
  • read.me > read
  • hello.bkp.txt > hello.bkp
  • weird..name > weird.
  • .hidden > .hidden

(or should the last one be just hidden?)

Edit: The original question assumed that the input is a filename (not a file path). Since some answers are talking about file paths, such functions should also work in cases like:

  • rare.folder/hello > rare.folder/hello

This particular case is handled very well by Sylvain M's answer.

Answer

sly7_7 picture sly7_7 · Aug 10, 2010

Using common io from apache http://commons.apache.org/io/

public static String removeExtension(String filename)

FYI, the source code is here:

http://commons.apache.org/proper/commons-io/javadocs/api-release/src-html/org/apache/commons/io/FilenameUtils.html#line.1025

Arg, I've just tried something...

System.out.println(FilenameUtils.getExtension(".polop")); // polop
System.out.println(FilenameUtils.removeExtension(".polop")); // empty string

So, this solution seems to be not very good... Even with common io, you'll have to play with removeExtension() getExtension() indexOfExtension()...

Related questions

Does groovy have an easy way to get a filename without the extension?

Say I have something like this: new File("test").eachFile() { file-> println file.getName() } This prints the full filename of every file in the test directory. Is there a Groovy way to get the filename without any extension? (Or …

Read More
Is there a new Java 8 way of retrieving the file extension?

What I did up until now is following: String fileName = "file.date.txt"; String ext = fileName.substring(fileName.lastIndexOf('.') + 1); System.out.printf("'%s'%n", ext); // prints: 'txt' Is there a more convenient way in Java 8?

Read More
How to get the format(ex:jpen,png,gif) of image file (BufferedImage) in java

i want to get the buffered image format or type of image using java, InputStream stream = request.getResponseStream(); BufferedImage image= ImageIO.read(stream); LOGGER.info(image);

Read More