How to Download and Use the Jar File for org.apache.commons.io.fileutils
If you are working with Java and need to perform various file manipulation tasks, such as reading, writing, copying, deleting, comparing, or listing files and directories, you might want to use the org.apache.commons.io.fileutils class. This class is part of the Apache Commons IO library, which provides many useful utilities for input/output operations.
In this article, you will learn what is org.apache.commons.io.fileutils, how to download and install the jar file for it, and how to use it in your code. You will also find some FAQs at the end of the article.
download jar for org.apache.commons.io.fileutils
What is org.apache.commons.io.fileutils?
A brief introduction to the class and its features
The org.apache.commons.io.fileutils class is a static class that provides general file manipulation utilities. It extends the functionality of the java.io.File class and offers many methods that are not available in the standard Java API. Some of these methods are:
writing to a file: you can write a string, a byte array, an input stream, or a collection of lines to a file, with options to append, overwrite, or create a new file.
reading from a file: you can read a file as a string, a byte array, an input stream, or a list of lines, with options to specify the encoding, the line separator, or the buffer size.
making a directory: you can create a directory, including any necessary parent directories.
copying files and directories: you can copy a file or a directory from one location to another, with options to preserve the date, filter the files, or overwrite existing files.
deleting files and directories: you can delete a file or a directory, including any subdirectories and files.
converting to and from a URL: you can convert a file to a URL or vice versa.
listing files and directories by filter and extension: you can list all files or directories in a directory that match certain criteria, such as name, size, date, extension, or custom filters.
comparing file content: you can compare two files by their content, ignoring end-of-line differences.
file last changed date: you can get or set the last modified date of a file.
calculating a checksum: you can calculate the checksum of a file using various algorithms, such as CRC32 or MD5.
The benefits of using it for file manipulation
Using org.apache.commons.io.fileutils for file manipulation has many benefits over using java.io.File or other classes in the standard Java API. Some of these benefits are:
Simplicity: you can perform complex file operations with a single line of code, without having to deal with low-level details, such as streams, buffers, exceptions, or loops.
Consistency: you can use the same methods for different types of files and directories, without having to worry about the differences in behavior or performance.
Reliability: you can trust that the methods will work as expected, as they have been tested and verified by many users and developers.
Flexibility: you can customize the methods to suit your needs, by using various parameters, options, or filters.
Compatibility: you can use the methods with any Java version from 1.2 onwards, and with any operating system that supports Java.
How to Download the Jar File for org.apache.commons.io.fileutils
The official website and the download link
The official website for the Apache Commons IO library is . Here you can find the latest news, releases, documentation, and source code for the library.
The download link for the jar file for org.apache.commons.io.fileutils is . Here you can find the binary and source distributions for the latest and previous versions of the library. You can also find the checksums and signatures for verifying the integrity of the downloaded files.
The steps to download and install the jar file
To download and install the jar file for org.apache.commons.io.fileutils, you need to follow these steps:
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import org.apache.commons.io.fileutils in java
use org.apache.commons.io.fileutils in eclipse
use org.apache.commons.io.fileutils to copy files
use org.apache.commons.io.fileutils to delete files
use org.apache.commons.io.fileutils to read files
use org.apache.commons.io.fileutils to write files
use org.apache.commons.io.fileutils to move files
use org.apache.commons.io.fileutils to compare files
use org.apache.commons.io.fileutils to list files
use org.apache.commons.io.fileutils to zip files
use org.apache.commons.io.fileutils to unzip files
use org.apache.commons.io.fileutils to create directories
use org.apache.commons.io.fileutils to check file size
use org.apache.commons.io.fileutils to check file extension
use org.apache.commons.io.fileutils to check file existence
use org.apache.commons.io.fileutils to check file permissions
use org.apache.commons.io.fileutils to rename files
use org.apache.commons.io.fileutils to filter files by name, size, date, etc.
use org.apache.commons.io.fileutils to monitor file changes
use org.apache.commons.io.fileutils to clean up temporary files
use org.apache.commons.io.fileutils to convert file paths and names
use org.apache.commons.io.fileutils to handle file encoding and decoding
use org.apache.commons.io.fileutils to handle file input and output streams and readers and writers
use org.apache.commons.io.fileutils to handle file endianness and byte order
use org.apache.commons.io.fileutils to handle file hex dump and byte array
use org.apache.commons.io.fileutils to handle file line iterator and line separator
Go to the download link and choose the binary distribution that matches your Java version and platform. For example, if you are using Java 8 on Windows, you can choose commons-io-2.11.0-bin.zip.
Click on the link and save the zip file to your preferred location on your computer.
Extract the zip file using a tool such as WinZip or 7-Zip. You will see a folder named commons-io-2.11.0, which contains several files and subfolders.
Locate the jar file named commons-io-2.11.0.jar, which is in the subfolder named commons-io-2.11.0. This is the jar file that contains the org.apache.commons.io.fileutils class and other classes in the library.
Copy or move the jar file to a location where you can access it from your Java project. For example, you can create a folder named lib in your project directory and paste the jar file there.
How to verify the integrity of the downloaded file
To verify the integrity of the downloaded file, you need to compare its checksum or signature with the ones provided on the download page. A checksum is a string of characters that represents a unique fingerprint of a file. A signature is a file that contains a digital signature of another file, created by a trusted authority using a private key. By comparing these values, you can ensure that the file has not been tampered with or corrupted during transmission.
To verify the checksum or signature of the downloaded file, you need to follow these steps:
Go to the download page and locate the checksum or signature that corresponds to your chosen binary distribution. For example, if you downloaded commons-io-2.11.0-bin.zip, you can find its checksum in .
Copy or save these values to a text file on your computer.
Use a tool such as SHA512sum or GPG to calculate or verify the checksum or signature of your downloaded file. For example, if you are using SHA512sum on Windows, you can open a command prompt and type sha512sum commons-io-2.11.0-bin.zip. If you are using GPG on Windows, you can open a command prompt and type gpg --verify commons-io-2 -11.0-bin.zip.asc commons-io-2.11.0-bin.zip.
Compare the output of the tool with the values you copied or saved in step 2. If they match, then the file is authentic and intact. If they do not match, then the file is corrupted or compromised and you should download it again from a trusted source.
How to Use the Jar File for org.apache.commons.io.fileutils
How to add the jar file to the classpath
To use the jar file for org.apache.commons.io.fileutils in your Java project, you need to add it to the classpath. The classpath is a list of locations where Java looks for classes and resources. There are different ways to set the classpath, depending on your development environment and your preferences. Some of these ways are:
Using an IDE: if you are using an integrated development environment (IDE) such as Eclipse, NetBeans, or IntelliJ IDEA, you can add the jar file to the classpath by using the built-in features of the IDE. For example, in Eclipse, you can right-click on your project, select Properties, then Java Build Path, then Libraries, then Add External JARs, and browse to the location of the jar file.
Using a build tool: if you are using a build tool such as Maven, Gradle, or Ant, you can add the jar file to the classpath by using the configuration files of the tool. For example, in Maven, you can add the following dependency to your pom.xml file:
<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.11.0</version> </dependency>
Using a command line: if you are using a command line to compile and run your Java program, you can add the jar file to the classpath by using the -cp or -classpath option of the javac and java commands. For example, if your jar file is in the lib folder and your source code is in the src folder, you can use these commands:
javac -cp lib/commons-io-2.11.0.jar src/*.java java -cp lib/commons-io-2.11.0.jar:src MainClass
How to import the class in the code
To use the methods of org.apache.commons.io.fileutils in your code, you need to import the class at the beginning of your source file. You can use either a single import statement or a wildcard import statement. For example:
// single import statement import org.apache.commons.io.FileUtils; // wildcard import statement import org.apache.commons.io.*;
You can also use the fully qualified name of the class without importing it, but this is not recommended as it makes your code less readable and more verbose. For example:
// fully qualified name org.apache.commons.io.FileUtils.copyFile(sourceFile, destFile);
Some examples of using the methods of the class
Here are some examples of using some of the methods of org.apache.commons.io.fileutils in your code. Assume that you have imported the class as shown above.
MethodDescriptionExample
writeStringToFile(File file, String data)Writes a string to a file, creating or overwriting it.// write "Hello world" to hello.txt FileUtils.writeStringToFile(new File("hello.txt"), "Hello world");
readFileToString(File file)Reads a file into a string.// read hello.txt into a string String content = FileUtils.readFileToString(new File("hello.txt"));
copyFile(File srcFile, File destFile)Copies a file from one location to another.// copy hello.txt to backup.txt FileUtils.copyFile(new File("hello.txt"), new File("backup.txt"));
deleteFile(File file)Deletes a file.// delete hello.txt FileUtils.deleteFile(new File("hello.txt"));
sizeOf(File file)Returns the size of a file in bytes.// get the size of backup.txt long size = FileUtils.sizeOf(new File("backup.txt"));
listFiles(File directory, String[] extensions, boolean recursive)Returns a collection of files in a directory that match the specified extensions, optionally including subdirectories.// get all the .txt and .java files in the src folder and its subfolders Collection files = FileUtils.listFiles(new File("src"), new String[]"txt", "java", true);
contentEquals(File file1, File file2)Compares the content of two files and returns true if they are equal.// check if backup.txt and hello.txt have the same content boolean equal = FileUtils.contentEquals(new File("backup.txt"), new File("hello.txt"));
Conclusion
In this article, you have learned how to download and use the jar file for org.apache.commons.io.fileutils, a useful class for file manipulation in Java. You have seen what is org.apache.commons.io.fileutils, how to download and install the jar file, how to add it to the classpath, how to import it in the code, and some examples of using its methods. You have also learned how to verify the integrity of the downloaded file using checksums or signatures.
If you want to learn more about org.apache.commons.io.fileutils or the Apache Commons IO library, you can visit the official website or check out the FAQs below. You can also try out the methods yourself by downloading the jar file and writing your own code. You will find that org.apache.commons.io.fileutils can make your file manipulation tasks much easier and faster.
FAQs
What are some alternatives to org.apache.commons.io.fileutils?
If you don't want to use org.apache.commons.io.fileutils or the Apache Commons IO library, you can use other libraries or frameworks that provide similar functionality. Some of these are:
Google Guava: a set of core libraries for Java that includes utilities for input/output, collections, concurrency, strings, and more. You can use the com.google.common.io.Files class for file manipulation.
NIO.2: a package in Java 7 and later that provides improved features for input/output, such as asynchronous channels, file attributes, file locking, and symbolic links. You can use the java.nio.file.Files class for file manipulation.
Spring Framework: a popular framework for Java that provides comprehensive infrastructure support for developing applications. You can use the org.springframework.util.FileCopyUtils class for file manipulation.
What are some common errors and exceptions when using org.apache.commons.io.fileutils?
When using org.apache.commons.io.fileutils, you might encounter some errors and exceptions that indicate something went wrong with your file operation. Some of these are:
FileNotFoundException: this exception is thrown when a file or directory does not exist or cannot be accessed.
IOException: this exception is thrown when an input/output error occurs, such as a network failure, a disk full, or a permission denied.
IllegalArgumentException: this exception is thrown when an invalid argument is passed to a method, such as a null value, an empty string, or an illegal character.
UnsupportedOperationException: this exception is thrown when a method is not supported by the underlying system or platform, such as creating a symbolic link on Windows.
How to update or uninstall the jar file for org.apache.commons.io.fileutils?
To update or uninstall the jar file for org.apache.commons.io.fileutils, you need to follow these steps:
To update the jar file, you need to download the latest version from the official website and replace the old jar file with the new one in your classpath. You might also need to update your code if there are any changes or additions in the new version of the library.
To uninstall the jar file, you need to remove it from your classpath and delete it from your computer. You might also need to remove any references to it in your code or replace them with other libraries or classes.
How to get help or support for org.apache.commons.io.fileutils?
If you need help or support for org.apache.commons.io.fileutils or the Apache Commons IO library, you can use the following resources:
The official website: you can find the latest documentation, source code, examples, and release notes on the official website.
The user mailing list: you can subscribe to the user mailing list and ask questions, share experiences, or provide feedback to other users and developers of the library. You can also browse the archives of previous messages.
The issue tracker: you can report bugs, request features, or suggest improvements on the issue tracker. You can also view the status and resolution of existing issues.
The Stack Overflow: you can search for questions and answers related to org.apache.commons.io.fileutils or the Apache Commons IO library on Stack Overflow, a popular online community for programmers. You can also post your own questions and answer others' questions.
Where can I find more documentation and tutorials on org.apache.commons.io.fileutils?
If you want to find more documentation and tutorials on org.apache.commons.io.fileutils or the Apache Commons IO library, you can use the following resources:
The Javadoc: you can find the detailed description of each class and method in the library, along with their parameters, return values, exceptions, and examples.
The Wiki: you can find various articles and guides on how to use the library for different purposes and scenarios.
The Cookbook: you can find a collection of recipes that demonstrate how to use the library for common tasks and problems.
The Blog: you can find news, tips, tricks, and insights on the library from the developers and contributors.
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