Introduction
Commons IO is a library of utilities to assist with developing IO functionality in Java. It provides various utility classes for common operations for File IO covering wide range of use cases. It helps avoid writing boilerplate code. It also provides various Comparator implementations for Files.
To use Commons IO, you need to download the latest version from the . You can also use Maven or Gradle to manage the dependency. For example, if you use Maven, you can add the following dependency to your pom.xml file:
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<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.11.0</version> </dependency>
Once you have the jar file or the dependency in your project, you can import the classes from the org.apache.commons.io package and start using them.
Using Commons IO
Commons IO provides many utility classes for working with files, streams, readers, writers, and more. In this section, I will show you some examples of how to use some of the most popular classes and methods.
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How to use FileUtils for file operations
FileUtils is a class that provides different operations on files, such as opening, reading, writing, copying, moving, deleting, comparing, filtering, listing, and more. For example, to read an entire file line by line, you can use the readLines method:
File file = new File("/commons/io/project.properties"); List<String> lines = FileUtils.readLines(file, "UTF-8");
To copy a file to another directory, you can use the copyFileToDirectory method:
File source = new File("/commons/io/project.properties"); File destDir = new File("/tmp"); FileUtils.copyFileToDirectory(source, destDir);
To delete a file or a directory recursively, you can use the deleteQuietly method:
File file = new File("/tmp/project.properties"); FileUtils.deleteQuietly(file);
How to use FilenameUtils for filename manipulation
FilenameUtils is a class that provides utility methods for working with filenames without using File objects. The class aims to be consistent between Unix and Windows, to aid transitions between these environments. For example, to get the extension of a filename, you can use the getExtension method:
String filename = "C:/commons/io/project.xml"; String extension = FilenameUtils.getExtension(filename); // result is "xml"
To get the base name of a filename without the extension, you can use the getBaseName method:
String filename = "C:/commons/io/project.xml"; String baseName = FilenameUtils.getBaseName(filename); // result is "project"
To normalize a filename by removing double dots and single dots segments, you can use the normalize method:
String filename = "C:/commons/io/../lang/project.xml"; String normalized = FilenameUtils.normalize(filename); // result is "C:/commons/lang/project.xml How to use IOUtils for stream and byte array handling
IOUtils is a class that provides utility methods for working with streams, readers, writers, and byte arrays. It can help you to copy, close, read, write, and convert data easily. For example, to copy the contents of an InputStream to an OutputStream, you can use the copy method:
InputStream in = new FileInputStream("/commons/io/project.xml"); OutputStream out = new FileOutputStream("/tmp/project.xml"); IOUtils.copy(in, out);
To read the contents of an InputStream into a byte array, you can use the toByteArray method:
InputStream in = new FileInputStream("/commons/io/project.xml"); byte[] bytes = IOUtils.toByteArray(in);
To write a String to a Writer using a specific encoding, you can use the write method:
Writer writer = new FileWriter("/tmp/project.txt"); String content = "This is a test"; IOUtils.write(content, writer, "UTF-8");
How to use FileSystemUtils for disk space information
FileSystemUtils is a class that provides utility methods for getting disk space information. It works on Windows, Unix, and Linux platforms. For example, to get the free space on a drive or volume in bytes, you can use the freeSpaceKb method:
long freeSpace = FileSystemUtils.freeSpaceKb("C:"); // result is in kilobytes
To get the total size of a drive or volume in bytes, you can use the totalSizeKb method:
long totalSpace = FileSystemUtils.totalSizeKb("C:"); // result is in kilobytes
How to use EndianUtils for byte order conversion
EndianUtils is a class that provides utility methods for converting between big-endian and little-endian byte order. Big-endian and little-endian are two ways of storing multibyte data types (such as int, long, float, double) in memory. Big-endian means that the most significant byte is stored first, while little-endian means that the least significant byte is stored first. For example, to convert an int value from big-endian to little-endian, you can use the swapInt method:
int value = 123456789; // 0x075BCD15 in hex int swapped = EndianUtils.swapInt(value); // 0x15CD5B07 in hex
To convert a long value from little-endian to big-endian, you can use the swapLong method:
long value = 1234567890123456789L; // 0x112210F4B16C9981 in hex long swapped = EndianUtils.swapLong(value); // 0x8199C6B14F102211 in hex
Benefits of Commons IO
Commons IO is a useful and convenient library for Java developers who need to work with IO functionality. It provides many benefits, such as:
- It can save time and avoid boilerplate code by providing ready-made utility methods for common tasks. - It can handle different platforms and encodings by abstracting away the details and providing consistent behavior. - It can reduce bugs and errors by providing robust and tested code that handles edge cases and exceptions. - It can improve readability and maintainability by providing clear and concise code that follows standard conventions. Alternatives to Commons IO
Commons IO is not the only library that provides IO utilities for Java. There are some other libraries that provide similar or complementary functionality, such as:
- Guava: A Google library that provides a wide range of utilities for collections, concurrency, functional programming, caching, primitives, strings, networking, math, and more. It also has some IO utilities for files, resources, streams, and byte arrays. - Apache Commons Lang: Another Apache library that provides utilities for strings, numbers, dates, arrays, objects, concurrency, reflection, and more. It also has some IO utilities for serialization and hex encoding. - Java NIO: A Java package that provides classes for non-blocking IO operations on channels, buffers, selectors, sockets, files, and more. It also has some utilities for file attributes, file systems, file visitors, and paths. Conclusion
In this article, I have shown you how to download and install Commons IO, and how to use some of its most useful classes and methods. I have also explained the benefits of using Commons IO, and some alternatives that you can consider. I hope you have learned something new and useful from this article, and that you will be able to use Commons IO in your own projects. If you want to learn more about Commons IO, you can visit the on GitHub, where you can see how the library is implemented and contribute to its development. Thank you for reading this article, and happy coding! FAQs
What is the difference between Commons IO and Java IO?
Commons IO is a library that provides additional utilities for working with IO functionality in Java. Java IO is a package that provides the core classes and interfaces for input and output operations in Java. Commons IO complements Java IO by providing more convenience methods, features, and abstractions.
How can I use Commons IO with Spring Boot?
Spring Boot is a framework that simplifies the development of Java applications. To use Commons IO with Spring Boot, you can add the dependency to your pom.xml file or your build.gradle file, depending on whether you use Maven or Gradle. Then, you can import and use the Commons IO classes in your code as usual.
How can I test my code that uses Commons IO?
Testing your code that uses Commons IO is similar to testing any other code that uses external libraries. You can use any testing framework or tool that you prefer, such as JUnit, TestNG, Mockito, etc. You can also use some of the classes provided by Commons IO itself for testing purposes, such as TestFileUtils and TestIOUtils.
How can I report bugs or request features for Commons IO?
If you encounter any bugs or issues with Commons IO, or if you have any suggestions or ideas for improving it, you can report them or request them on the to discuss with other users and developers of Commons IO.
How can I support the development of Commons IO?
If you want to support the development of Commons IO, you can do so in various ways. You can contribute code, documentation, tests, or translations to the project on GitHub. You can also donate money to the , which hosts and supports Commons IO and many other open source projects. 44f88ac181
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