Remove the extension of a file [duplicate]

This question already has answers here: How do I trim a file extension from a String in Java? (24 answers) Closed 6 years ago.

Given a filename like:

 package.zip    image.jpeg   video.avi etc

I'd like to remove the extension if exists. How can I m开发者_Python百科ake this in Java? THanks!

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Something like

if (name.indexOf(".") > 0)
    name = name.substring(0, name.lastIndexOf("."));

The index check avoids turning hidden files like ".profile" into "", and the lastIndexOf() takes care of names like cute.kitty.jpg.

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Use Apache Commons IO, FilenameUtils.getBaseName(String filename) or removeExtension(String filename), if you need the path too.

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Here is a slightly more robust version:

public static String stripExtension(final String s)
{
    return s != null && s.lastIndexOf(".") > 0 ? s.substring(0, s.lastIndexOf(".")) : s;
}

Gracefully handles null, cases where there is nothing that looks like an extension and doesn't molest files that start with a ., this also handles the .kitty.jpg problem as well.

This will handle most general cases in a controlled environment, if the suffix isn't actually an extension, just something . separated then you need to add some checking to see if the trailing part actually is an extension you recognize.

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myString = myString.replaceAll("\\.\\w+", "");

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String result = filename.substring(0, filename.lastIndexOf("."))

Do check to see if the filename has a . before calling substring().

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String name = filename.lastIndexOf('.') > filename.lastIndexOf(File.separatorChar) ?
     filename.substring(0, filename.lastIndexOf('.'))
   : filename;

The comparison checks that the filename itself contains a ., otherwise the string is returned unchanged.

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Pattern suffix = Pattern.compile("\\.\\p{Alnum}+$");
Matcher m = suffix.matcher(filename);
String clearFilename = m.replaceAll("");

The problem of this solution is that, depending of your requirements, you need to extend it to support composed extensions, like filename.tar.gz, filename.tar.bz2

[]'s

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