Commons IO 2.7 Jar Download: A Guide for Java Developers
If you are a Java developer, you probably know how tedious and error-prone it can be to work with input and output (IO) operations. You have to deal with streams, readers, writers, files, directories, filters, comparators, and more. You have to write boilerplate code, handle exceptions, close resources, and ensure compatibility across different platforms.
Fortunately, there is a library that can make your life easier: Apache Commons IO. In this article, we will explain what Commons IO is, why you should use it, how to download and install it, how to use it in your Java project, and what are some alternatives to it.
commons io 2.7 jar download
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What is Commons IO and why use it?
Commons IO is a library of utilities that assists with developing IO functionality. It provides various utility classes for common operations for file IO covering a wide range of use cases. It helps you avoid writing boilerplate code and rely on well-tested code.
Commons IO is part of the Apache Commons project, which aims to provide developers with a set of common libraries that they can use in their day-to-day code. Commons IO has been around since 2004 and has been updated regularly to support new features and bug fixes.
Benefits of Commons IO
Some of the benefits of using Commons IO are:
It simplifies common IO tasks such as reading, writing, copying, moving, deleting, and comparing files.
It provides utility classes for working with streams, readers, writers, files, directories, filters, comparators, and more.
It supports both byte and character streams, as well as buffered and unbuffered streams.
It provides endian classes for converting between big-endian and little-endian byte orders.
It provides input and output classes that extend the functionality of the standard Java classes.
It provides file filters that implement both FileFilter and FilenameFilter interfaces.
It provides file monitors that can detect changes in files and directories.
It provides serialization classes that can control the deserialization of objects.
It is compatible with Java 6 or higher and works across different platforms.
It is open source and free to use under the Apache License 2.0.
Features of Commons IO
The main features of Commons IO are:
Package
Description
org.apache.commons.io
This package defines utility classes for working with streams, readers, writers, and files.
org.apache.commons.io.comparator
This package provides various Comparator implementations for Files.
org.apache.commons.io.file
This package provides extensions in the realm of java.nio.file.
org.apache.commons.io.filefilter
This package defines an interface (IOFileFilter) that combines both FileFilter and FilenameFilter.
How to download and install Commons IO 2.7 jar
The latest version of Commons IO is 2.7, which was released on October 16, 2020. There are two ways to download and install Commons IO 2.7 jar: from the Apache website or from Maven Central.
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Prerequisites
Before you download and install Commons IO 2.7 jar, you need to have the following prerequisites:
A Java Development Kit (JDK) version 6 or higher installed on your system. You can download the JDK from .
A Java IDE (Integrated Development Environment) such as Eclipse, IntelliJ IDEA, NetBeans, or Visual Studio Code. You can use any IDE that supports Java development.
A basic knowledge of Java programming and IO operations.
Downloading from Apache website
To download Commons IO 2.7 jar from the Apache website, follow these steps:
Go to the .
Under the "Binaries" section, click on the link that says "commons-io-2.7-bin.zip". This will download a zip file containing the jar files and other resources.
Extract the zip file to a location of your choice. You will see a folder named "commons-io-2.7" that contains several subfolders and files.
Locate the file named "commons-io-2.7.jar" in the "commons-io-2.7" folder. This is the main jar file that contains all the classes and methods of Commons IO.
Copy the "commons-io-2.7.jar" file to your project's classpath or library folder. Alternatively, you can add it as an external jar in your IDE.
Downloading from Maven Central
If you are using Maven as your build tool, you can download and install Commons IO 2.7 jar from Maven Central by adding the following dependency to your pom.xml file:
<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-io</artifactId> <version>2.7</version> </dependency>
Maven will automatically download and install the jar file and its dependencies when you run your project.
Verifying the integrity of the downloaded files
It is recommended that you verify the integrity of the downloaded files using cryptographic signatures or checksums. This will ensure that the files have not been tampered with or corrupted during transmission.
The Apache website provides to verify the signatures or checksums.
For example, to verify the PGP signature of the "commons-io-2.7-bin.zip" file, you can use the following command:
gpg --verify commons-io-2.7-bin.zip.asc commons-io-2.7-bin.zip
If the verification is successful, you will see a message like this:
gpg: Signature made Fri 16 Oct 2020 10:32:50 AM PDT gpg: using RSA key CBF9E9A8F6AC6C4068F5B1B33B465E64C4FAA07F gpg: Good signature from "Gary Gregory <ggregory@apache.org>" [unknown] gpg: aka "Gary Gregory <ggregory@seagullsw.com>" [unknown] gpg: aka "Gary Gregory <ggregory@seagullsoftware.com>" [unknown] gpg: aka "Gary Gregory <garydgregory@gmail.com>" [unknown] gpg: WARNING: This key is not certified with a trusted signature! gpg: There is no indication that the signature belongs to the owner. How to use Commons IO in your Java project
Once you have downloaded and installed Commons IO 2.7 jar, you can start using it in your Java project. Here are some steps to follow:
Adding Commons IO as a dependency
If you are using Maven as your build tool, you don't need to do anything else, as Maven will automatically add Commons IO as a dependency to your project. However, if you are not using Maven, you need to manually add Commons IO to your project's classpath or library folder.
You can do this by copying the "commons-io-2.7.jar" file to your project's classpath or library folder, or by adding it as an external jar in your 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.
Importing Commons IO classes
To use Commons IO classes in your Java code, you need to import them first. You can either import specific classes or packages, or use a wildcard (*) to import all classes from a package.
For example, to import the FileUtils class, which provides various utility methods for working with files, you can use the following statement:
import org.apache.commons.io.FileUtils;
Or, to import all classes from the org.apache.commons.io package, you can use the following statement:
import org.apache.commons.io.*;
Using Commons IO utility classes
Commons IO provides various utility classes that offer static methods for common IO tasks. Some of the most useful utility classes are:
FileUtils: This class provides methods for reading, writing, copying, moving, deleting, and comparing files and directories.
IOUtils: This class provides methods for reading, writing, copying, and closing streams.
FilenameUtils: This class provides methods for manipulating filenames and paths.
EndianUtils: This class provides methods for converting between big-endian and little-endian byte orders.
HexDump: This class provides methods for dumping data in hexadecimal format.
Charsets: This class provides constants for common character sets.
For example, to copy a file from one location to another using FileUtils, you can use the following code:
// Copy file from source to destination File source = new File("C:\\Users\\user\\Documents\\source.txt"); File destination = new File("C:\\Users\\user\\Documents\\destination.txt"); FileUtils.copyFile(source, destination);
Using Commons IO input and output classes
Commons IO also provides input and output classes that extend the functionality of the standard Java classes. Some of the most useful input and output classes are:
TeeInputStream: This class allows you to read from an input stream and write to one or more output streams at the same time.
TeeOutputStream: This class allows you to write to an output stream and read from one or more input streams at the same time.
CountingInputStream: This class counts the number of bytes read from an input stream.
CountingOutputStream: This class counts the number of bytes written to an output stream.
ClosedInputStream: This class returns -1 when read is called.
ClosedOutputStream: This class does nothing when write is called.
NullInputStream: This class provides an input stream that has no content.
NullOutputStream: This class provides an output stream that discards all data.
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.
ChunkedInputStream: This class decodes data written in chunked format from an input stream.
ChunkedOutputStream: This class encodes data in chunked format to an output stream.
SwappedDataInputStream: This class reads data from an input stream with a different byte order than the native order.
SwappedDataOutputStream: This class writes data to an output stream with a different byte order than the native order.
ProxyInputStream: This class provides a base class for implementing proxy input streams.
ProxyOutputStream: This class provides a base class for implementing proxy output streams.
For example, to count the number of bytes read from an input stream using CountingInputStream, you can use the following code:
// Create a counting input stream that wraps another input stream InputStream in = new FileInputStream("C:\\Users\\user\\Documents\\source.txt"); CountingInputStream cin = new CountingInputStream(in); // Read data from the counting input stream byte[] buffer = new byte[1024]; int len; while ((len = cin.read(buffer)) != -1) // Do something with the data // Get the number of bytes read long count = cin.getByteCount(); // Close the streams cin.close(); in.close();
Using Commons IO file filters
Commons IO also provides file filters that implement both FileFilter and FilenameFilter interfaces. These filters can be used to filter files and directories based on various criteria, such as name, size, date, extension, and more. Some of the most useful file filters are:
NameFileFilter: This filter matches files and directories by their names.
SizeFileFilter: This filter matches files and directories by their sizes.
DateFileFilter: This filter matches files and directories by their last modified dates.
ExtensionFileFilter: This filter matches files by their extensions.
PrefixFileFilter: This filter matches files and directories by their prefixes.
SuffixFileFilter: This filter matches files and directories by their suffixes.
RegexFileFilter: This filter matches files and directories by a regular expression.
WildcardFileFilter: This filter matches files and directories by a wildcard pattern.
AndFileFilter: This filter combines multiple filters using a logical AND operation.
OrFileFilter: This filter combines multiple filters using a logical OR operation.
NotFileFilter: This filter negates another filter using a logical NOT operation.
TrueFileFilter: This filter always returns true.
FalseFileFilter: This filter always returns false.
DirectoryFileFilter: This filter matches directories only.
FileFileFilter: This filter matches files only.
HiddenFileFilter: This filter matches hidden files and directories only.
CanReadFileFilter: This filter matches files and directories that can be read only.
CanWriteFileFilter: This filter matches files and directories that can be written only.
CanExecuteFileFilter: This filter matches files and directories that can be executed only.
EmptyFileFilter: This filter matches empty files and directories only.
For example, to list all the text files in a directory using ExtensionFileFilter, you can use the following code:
// Create an extension file filter that accepts txt files ExtensionFileFilter txtFilter = new ExtensionFileFilter("txt"); // List all the text files in a directory File dir = new File("C:\\Users\\user\\Documents"); String[] txtFiles = dir.list(txtFilter); // Print the names of the text files for (String txtFile : txtFiles) System.out.println(txtFile);
Alternatives to Commons IO
Commons IO is not the only library that provides IO functionality for Java developers. There are some alternatives that you can consider, depending on your needs and preferences. Some of the most popular alternatives are:
Guava
, and more. It also provides some IO utilities, such as Files, ByteStreams, CharStreams, Closer, and Resources. Guava is compatible with Java 8 or higher and works across different platforms. Guava is open source and free to use under the Apache License 2.0.
NIO
(New IO) is a set of APIs that provide advanced IO functionality for Java development. It includes features such as non-blocking IO, channels, buffers, selectors, charsets, regular expressions, file systems, and more. NIO is part of the standard Java platform since Java 1.4 and has been updated regularly to support new features and bug fixes. NIO is compatible with Java 6 or higher and works across different platforms. NIO is open source and free to use under the GNU General Public License.
Spring Framework
is a comprehensive framework that provides a wide range of features for Java development. It includes modules for dependency injection, aspect-oriented programming, web development, data access, testing, security, and more. It also provides some IO utilities, such as Resource, ResourceLoader, FileSystemResource, ClassPathResource, UrlResource, and InputStreamResource. Spring Framework is compatible with Java 8 or higher and works across different platforms. Spring Framework is open source and free to use under the Apache License 2.0.
Conclusion
In this article, we have learned about Commons IO 2.7 jar download, a library of utilities that assists with developing IO functionality for Java developers. We have explained what Commons IO is, why you should use it, how to download and install it, how to use it in your Java project, and what are some alternatives to it.
We hope that this article has helped you understand Commons IO better and how it can simplify your IO tasks. If you have any questions or feedback, please feel free to leave a comment below.
Frequently Asked Questions
Here are some frequently asked questions about Commons IO:
Q: What is the difference between Commons IO and Apache IO?
A: Commons IO and Apache IO are the same thing. Commons IO is part of the Apache Commons project, which is a collection of common libraries for Java development.
Q: How do I update Commons IO to the latest version?
A: To update Commons IO to the latest version, you need to download and install the new jar file from the Apache website or Maven Central. You also need to update your project's classpath or dependency settings accordingly.
Q: How do I uninstall Commons IO?
A: To uninstall Commons IO, you need to remove the jar file from your project's classpath or library folder. You also need to remove any references to Commons IO classes in your code.
Q: Is Commons IO thread-safe?
A: Commons IO does not guarantee thread-safety for its classes and methods. You need to ensure proper synchronization and concurrency control when using Commons IO in a multi-threaded environment.
Q: Where can I find more information about Commons IO?
A: You can find more information about Commons IO on the , which includes documentation, examples, source code, issue tracker, mailing list, and more. 44f88ac181
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