Path processing and file name operation technical principles in Apache Commons IO frameworks
The Apache Commons IO framework is a popular Java development toolkit, which provides many technologies for path processing and file name operations.This article will explore the principles of these technologies and provide some Java code examples.
1. Path processing:
Path processing refers to the process of analyzing, standardizing and conversion of the file path.The Apache Commons IO framework provides many convenient methods to handle paths.
a. Analysis path:
Apache Commons IO provides the `Filenameutils` class to analyze the file path.You can use the method to get the directory part in the path to obtain the directory part in the path, and use the method to obtain the file name part in the directory part in the path.
import org.apache.commons.io.FilenameUtils;
String fullPath = "C:\\mydir\\myfile.txt";
String directory = FilenameUtils.getFullPath(fullPath);
String filename = FilenameUtils.getName(fullPath);
System.out.println("directory: " + directory);
System.out.println("filename: " + filename);
Output results:
directory: C:\mydir\
filename: myfile.txt
b. Standardized road:
Sometimes the path needs to be standardized to remove the excess slash and dot number.Apache Commons IO provides a method to complete this task with `FILENAMEUTILS.NORMALIZE ()` method.
import org.apache.commons.io.FilenameUtils;
String path = "C:\\mydir\\..\\myfile.txt";
String normalizedPath = FilenameUtils.normalize(path);
System.out.println("normalized path: " + normalizedPath);
Output results:
normalized path: C:\myfile.txt
c. Conversion path:
Sometimes the path needs to be converted from the UNIX style to the Windows style, or vice versa.Apache Commont IO provides `Filenameutils.Sepratorsstounix () and` Filenameutils.SepratorsStowindows () and `Filenameutils.normalizeParators () 'to complete these transfers. Change.
import org.apache.commons.io.FilenameUtils;
String unixPath = "dir1/dir2/file.txt";
String windowsPath = FilenameUtils.separatorsToWindows(unixPath);
String normalizedPath = FilenameUtils.normalizeNoEndSeparator(windowsPath);
System.out.println("Unix path: " + unixPath);
System.out.println("Windows path: " + windowsPath);
System.out.println("Normalized path: " + normalizedPath);
Output results:
Unix path: dir1/dir2/file.txt
Windows path: dir1\dir2\file.txt
Normalized path: dir1\dir2
2. File name operation:
File name operation refers to the process of modifying, stitching and comparison of the file name.The Apache Commons IO framework provides some practical methods to perform these operations.
a. Modify the file name:
Apache Commont IO provides `Filenameutils.getName () and` Filenameutils.GetextExSION () method to obtain the name and expansion name in the file name.You can also use the `FILENAMEUTILS.RMoveExtent () method to remove the expansion name in the file name.
import org.apache.commons.io.FilenameUtils;
String filename = "myfile.txt";
String name = FilenameUtils.getName(filename);
String extension = FilenameUtils.getExtension(filename);
String baseName = FilenameUtils.removeExtension(filename);
System.out.println("file name: " + filename);
System.out.println("name: " + name);
System.out.println("extension: " + extension);
System.out.println("base name: " + baseName);
Output results:
file name: myfile.txt
name: myfile
extension: txt
base name: myfile
b. Stitching file name:
Apache Commons IO provides `Filenameutils.concat ()` method for stitching two file names.
import org.apache.commons.io.FilenameUtils;
String directory = "C:\\mydir";
String filename = "myfile.txt";
String concatenated = FilenameUtils.concat(directory, filename);
System.out.println("concatenated: " + concatenated);
Output results:
concatenated: C:\mydir\myfile.txt
c. Compare file name:
Apache Commons IO provides `Filenameutils.WildCardmatch ()` method is used to compare the file name and a pattern with compatible matching.
import org.apache.commons.io.FilenameUtils;
String filename = "myfile.txt";
String pattern = "*.txt";
boolean isMatch = FilenameUtils.wildcardMatch(filename, pattern);
System.out.println("filename: " + filename);
System.out.println("pattern: " + pattern);
System.out.println("is match: " + isMatch);
Output results:
filename: myfile.txt
pattern: *.txt
is match: true
In summary, the Apache Commons IO framework provides a set of powerful tools and methods for processing paths and file names.Through these technologies, developers can easily analyze, standardize, convers, and operate file paths and file names.These technologies can greatly simplify the development process whether in the file system operation or writing the file operation tool class.
