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Aug 2, 20237 min read

commons-io-2.4.jar: The Ultimate Java IO Library You Can't Miss

How to Download and Use commons-io-2.4.jar in Java

If you are a Java developer, you might have encountered the need to perform various operations on files, streams, readers, writers, and other IO-related tasks. However, the standard Java IO API can be cumbersome and verbose to use, and it does not provide many useful features that can make your life easier. That's where commons-io-2.4.jar comes in handy.

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What is commons-io-2.4.jar

commons-io-2.4.jar is a library of utilities that assists with developing IO functionality. It is part of the Apache Commons project, which provides a set of common libraries that can be used in various Java applications. The commons-io-2.4.jar library contains many classes that can help you with tasks such as copying, deleting, moving, comparing, filtering, and monitoring files, working with streams, readers, writers, and byte arrays, converting between different character sets, and much more.

Why use commons-io-2.4.jar

There are many benefits of using commons-io-2.4.jar in your Java projects. Some of them are:

It simplifies the code and reduces boilerplate.

It provides consistent and reliable behavior across different platforms.

It supports compression, encryption, serialization, and other advanced features.

It is well-tested and widely used by many developers.

It is compatible with Java 6 and above.

How to Download commons-io-2.4.jar

There are several ways to download commons-io-2.4.jar and add it to your project. Here are some of the most common ones:

Using Maven

If you are using Maven as your build tool, you can simply add the following dependency to your pom.xml file:

<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency>

Maven will automatically download the jar file and its dependencies from the Maven Central repository and add them to your project.

Using Java2s

If you prefer to download the jar file manually, you can use the Java2s website, which provides a collection of jar files for various Java libraries. To download commons-io-2.4.jar from Java2s, you can follow these steps:

Go to

Click on the "Download commons-io-2.4.jar" link.

Save the jar file to your desired location.

Using Apache Commons IO website

You can also download the jar file directly from the Apache Commons IO website, which provides the latest and previous versions of the library, as well as the source code and documentation. To download commons-io-2.4.jar from the Apache Commons IO website, you can follow these steps:

Go to

Click on the "Download" link on the left sidebar.

Select "Commons IO 2.4" from the list of releases.

Click on the "Binaries Using Apache Commons IO website

Go to

Click on the "Download" link on the left sidebar.

Select "Commons IO 2.4" from the list of releases.

Click on the "Binaries" link under the "Files" section.

Click on the "commons-io-2.4-bin.zip" or "commons-io-2.4-bin.tar.gz" link, depending on your preferred format.

Extract the zip or tar file to your desired location.

Find the commons-io-2.4.jar file inside the extracted folder.

How to Use commons-io-2.4.jar

Once you have downloaded the jar file, you can start using it in your Java projects. Here are some of the steps you need to follow:

How to download commons-io-2.4.jar from Maven repository

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Adding the jar file to the classpath

To use commons-io-2.4.jar in your Java projects, you need to add it to the classpath, which is a list of locations where Java looks for classes and resources. There are different ways to add a jar file to the classpath, depending on your development environment and preferences. Here are some of the most common ones:

If you are using an IDE (Integrated Development Environment) such as Eclipse, NetBeans, or IntelliJ IDEA, you can simply right-click on your project, select "Properties", and then "Java Build Path". Then, click on the "Libraries" tab and then on the "Add External JARs..." button. Browse to the location where you saved commons-io-2.4.jar and select it. Click on "OK" and then "Apply and Close".

If you are using a command-line tool such as javac or java, you can use the -cp or -classpath option to specify the location of commons-io-2.4.jar. For example, if you want to compile a Java file named Test.java that uses commons-io-2.4.jar, you can use this command:

javac -cp .;commons-io-2.4.jar Test.java

The . (dot) represents the current directory, and the ; (semicolon) is used to separate multiple locations. If you are using Linux or Mac OS, you need to use : (colon) instead of ; (semicolon). To run the compiled class file, you can use this command:

java -cp .;commons-io-2.4.jar Test

If you are using a build tool such as Maven or Gradle, you can add commons-io-2.4.jar as a dependency in your pom.xml or build.gradle file, respectively. For example, if you are using Maven, you can add this snippet to your pom.xml file:

<dependencies> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> </dependencies>

The build tool will automatically download and add commons-io-2.4.jar to your classpath.

Using utility classes

The commons-io-2.4.jar library provides many utility classes that can help you with various IO tasks. Some of them are:

FileUtils: This class provides static methods for working with files and directories, such as copying, moving, deleting, reading, writing, comparing, listing, filtering, and monitoring files.

IOUtils: This class provides static methods for working with streams, readers, writers, and byte arrays, such as copying, closing, reading, writing, converting, and comparing them.

FilenameUtils: This class provides static methods for working with filenames and paths, such as normalizing, concatenating, splitting, getting extensions, and checking prefixes and suffixes.

FileSystemUtils: This class provides static methods for working with file systems, such as getting free space and disk size.

EndianUtils: This class EndianUtils: This class provides static methods for converting between different byte orderings, such as big-endian and little-endian.

Hex: This class provides static methods for encoding and decoding hexadecimal strings.

Charsets: This class provides constants and methods for working with different character sets, such as UTF-8, ISO-8859-1, and US-ASCII.

To use these utility classes, you need to import them in your Java code. For example, if you want to use FileUtils, you need to add this statement at the top of your Java file:

import org.apache.commons.io.FileUtils;

Then, you can use the methods of FileUtils in your code. For example, if you want to copy a file from one location to another, you can use this statement:

FileUtils.copyFile(new File("source.txt"), new File("destination.txt"));

Using input and output classes

The commons-io-2.4.jar library also provides many input and output classes that can help you with reading and writing data in different formats and scenarios. Some of them are:

TeeInputStream: This class allows you to read from an input stream and write the same data to one or more output streams at the same time.

TeeOutputStream: This class allows you to write to an output stream and read the same data from one or more input streams at the same time.

CountingInputStream: This class counts the number of bytes that have been read from an input stream.

CountingOutputStream: This class counts the number of bytes that have been written to an output stream.

BoundedInputStream: This class limits the number of bytes that can be read from an input stream.

BoundedOutputStream: This class limits the number of bytes that can be written to an output stream.

CloseShieldInputStream: This class prevents the underlying input stream from being closed when this stream is closed.

CloseShieldOutputStream: This class prevents the underlying output stream from being closed when this stream is closed.

SwappedDataInputStream: This class reads data from an input stream using a different byte order than the native one.

SwappedDataOutputStream: This class writes data to an output stream using a different byte order than the native one.

ReversedLinesFileReader: This class reads lines from a file in reverse order.

Tailer: This class monitors a file for changes and notifies a listener when new data is appended to the file.

To use these input and output classes, you need to import them in your Java code. For example, if you want to use TeeInputStream, you need to add this statement at the top of your Java file:

import org.apache.commons.io.input.TeeInputStream;

Then, you can create an instance of TeeInputStream and use it in your code. For example, if you want to read from a file and write the same data to another file and to the console, you can use this code:

FileInputStream fis = new FileInputStream("input.txt"); FileOutputStream fos = new FileOutputStream("output.txt"); TeeOutputStream tos = new TeeOutputStream(fos, System.out); TeeInputStream tis = new TeeInputStream(fis, tos); byte[] buffer = new byte[1024]; int len; while ((len = tis.read(buffer)) != -1) // do something with buffer tis.close(); // this will also close fis, fos, and tos

Using filters

The commons-io-2.4.jar library also provides many filters that can help you with selecting files or directories based on certain criteria. Some of them are:

NameFileFilter: This filter accepts files or directories that match a specified name or a list of names.

SuffixFileFilter: This filter accepts files or directories that have a specified suffix or a list of suffixes.

PrefixFileFilter: This filter accepts files or directories that have a specified prefix or a list of prefixes.

WildcardFileFilter: This filter accepts files or directories that match a specified wildcard pattern or a list dependencies implementation 'commons-io:commons-io:2.4'

Q: How can I use commons-io-2.4.jar with Spring Boot?

A: You can use commons-io-2.4.jar with Spring Boot projects by adding it as a dependency in your pom.xml file. For example, you can add this snippet to your pom.xml file: