How to Efficiently Retrieve File Extensions in Java?

Retrieving File Extensions in Java

Obtaining the file extension of a given file in Java is a common task. To achieve this without creating custom parsers, there are several built-in methods available.

Using FilenameUtils.getExtension from Apache Commons IO

The Apache Commons IO library offers a convenient method, FilenameUtils.getExtension, to extract file extensions. It can be used as follows:

import org.apache.commons.io.FilenameUtils;

// ...

String ext1 = FilenameUtils.getExtension("/path/to/file/foo.txt"); // "txt"
String ext2 = FilenameUtils.getExtension("bar.exe"); // "exe"

Maven Dependency

To use FilenameUtils.getExtension, you can include the following dependency in your Maven project:

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.6</version>
</dependency>

Gradle Dependencies

For Gradle Groovy DSL and Kotlin DSL, the dependencies are as follows:

Groovy DSL

implementation 'commons-io:commons-io:2.6'

Kotlin DSL

implementation("commons-io:commons-io:2.6")

For other dependency management systems, please refer to Maven Central:

https://search.maven.org/artifact/commons-io/commons-io/2.6/jar

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