Apache Commons IO - FilenameUtils
Provides method to work with file names without using File Object. It works on different operating systems in similar way. This class solves problems when moving from a Windows based development machine to a Unix based production machine.
Class Declaration
Following is the declaration for org.apache.commons.io.FilenameUtils Class −
public class FilenameUtils
extends Object
Features
This class defines six components within a filename. Consider an example location as C:\dev\project\file.txt. Then the components are −
- Prefix - C:\
- Relative Path - dev\project\
- Absolute path - C:\dev\project\
- Name - file.txt
- Base name - file
- Extension - txt
To identify a directory, add a separator to file name.
Example of FilenameUtils Class
IOTester.java
import java.io.IOException;
import org.apache.commons.io.FilenameUtils;
public class IOTester {
public static void main(String[] args) {
try {
//Using FilenameUtils
usingFilenameUtils();
} catch(IOException e) {
System.out.println(e.getMessage());
}
}
public static void usingFilenameUtils() throws IOException {
String path = "C:\\dev\\project\\file.txt";
System.out.println("Full Path: " +FilenameUtils.getFullPath(path));
System.out.println("Relative Path: " +FilenameUtils.getPath(path));
System.out.println("Prefix: " +FilenameUtils.getPrefix(path));
System.out.println("Extension: " + FilenameUtils.getExtension(path));
System.out.println("Base: " + FilenameUtils.getBaseName(path));
System.out.println("Name: " + FilenameUtils.getName(path));
String filename = "C:/commons/io/../lang/project.xml";
System.out.println("Normalized Path: " + FilenameUtils.normalize(filename));
}
}
Output
It will print the following result.
Full Path: C:\dev\project\
Relative Path: dev\project\
Prefix: C:\
Extension: txt
Base: file
Name: file.txt
Normalized Path: C:\commons\lang\project.xml