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Full Java Code - How to list specific type of files in Java using FileFilter interface?
Table of Contents [hide]
Program Output
Output of the program will look like this:
All Types of Files:
c:\projects\flowers.gif
c:\projects\error.log
c:\projects\z.src
c:\projects\start.xml
c:\projects\end.xml
c:\projects\documentation.txt
XML Files:
c:\projects\start.xml
c:\projects\end.xml
TEXT Files:
c:\projects\documentation.txt
c:\projects\flowers.gif
c:\projects\error.log
c:\projects\z.src
c:\projects\start.xml
c:\projects\end.xml
c:\projects\documentation.txt
XML Files:
c:\projects\start.xml
c:\projects\end.xml
TEXT Files:
c:\projects\documentation.txt
Example Program: FilterFiles.java
// Java class FilterFiles
import java.io.File;
import java.io.FileFilter;
public class FilterFiles
{
// StringThe String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class. Below are all the articles related to String. constants - file extensions
public static final String EXT_XML = ".xml";
public static final String EXT_TXT = ".txt";
protected FileFilter xmlFilter = null;
protected FileFilter txtFilter = null;
public FilterFiles()
{
// Create a file filter to locate only xml files
xmlFilter = new FileFilter()
{
public boolean accept(File file)
{
String sPath = file.getName();
if( sPath.endsWith(EXT_XML) )
{
return true;
}
else
{
return false;
}
}
};
// Create a file filter to locate only text files
txtFilter = new FileFilter()
{
public boolean accept(File file)
{
String sPath = file.getName();
if( sPath.endsWith(EXT_TXT) )
{
return true;
}
else
{
return false;
}
}
};
}
public void getFiles(String dirPath)
{
File dir = new File(dirPath);
if(dir.exists())
{
// list all types of files
File[] allFiles = dir.listFiles();
if(allFiles != null)
{
// Print them out in the console
System.out.println("All Types of Files: ");
for(int n = 0; n < allFiles.length; n++)
{
System.out.println(allFiles[n]);
}
}
else
{
System.out.println("No files in folder: "+ dirPath);
}
// list only xml files
File[] xmlFiles = dir.listFiles(xmlFilter);
if(xmlFiles != null)
{
// Print them out in the console
System.out.println("XML Files: ");
for(int n = 0; n < xmlFiles.length; n++)
{
System.out.println(xmlFiles[n]);
}
}
else
{
System.out.println("No xml files in folder: "+ dirPath);
}
// list only text files
File[] txtFiles = dir.listFiles(txtFilter);
if(txtFiles != null)
{
// Print them out in the console
System.out.println("TEXT Files: ");
for(int n = 0; n < txtFiles.length; n++)
{
System.out.println(txtFiles[n]);
}
}
else
{
System.out.println("No text files in folder: "+ dirPath);
}
}
else
{
System.out.println("Folder "+ dirPath + " does not exist!");
}
}
/**
* @param args
*/
public static void main(String[] args)
{
FilterFiles object = new FilterFiles();
object.getFiles("c:/projects");
}
} // End of class
import java.io.File;
import java.io.FileFilter;
public class FilterFiles
{
// StringThe String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class. Below are all the articles related to String. constants - file extensions
public static final String EXT_XML = ".xml";
public static final String EXT_TXT = ".txt";
protected FileFilter xmlFilter = null;
protected FileFilter txtFilter = null;
public FilterFiles()
{
// Create a file filter to locate only xml files
xmlFilter = new FileFilter()
{
public boolean accept(File file)
{
String sPath = file.getName();
if( sPath.endsWith(EXT_XML) )
{
return true;
}
else
{
return false;
}
}
};
// Create a file filter to locate only text files
txtFilter = new FileFilter()
{
public boolean accept(File file)
{
String sPath = file.getName();
if( sPath.endsWith(EXT_TXT) )
{
return true;
}
else
{
return false;
}
}
};
}
public void getFiles(String dirPath)
{
File dir = new File(dirPath);
if(dir.exists())
{
// list all types of files
File[] allFiles = dir.listFiles();
if(allFiles != null)
{
// Print them out in the console
System.out.println("All Types of Files: ");
for(int n = 0; n < allFiles.length; n++)
{
System.out.println(allFiles[n]);
}
}
else
{
System.out.println("No files in folder: "+ dirPath);
}
// list only xml files
File[] xmlFiles = dir.listFiles(xmlFilter);
if(xmlFiles != null)
{
// Print them out in the console
System.out.println("XML Files: ");
for(int n = 0; n < xmlFiles.length; n++)
{
System.out.println(xmlFiles[n]);
}
}
else
{
System.out.println("No xml files in folder: "+ dirPath);
}
// list only text files
File[] txtFiles = dir.listFiles(txtFilter);
if(txtFiles != null)
{
// Print them out in the console
System.out.println("TEXT Files: ");
for(int n = 0; n < txtFiles.length; n++)
{
System.out.println(txtFiles[n]);
}
}
else
{
System.out.println("No text files in folder: "+ dirPath);
}
}
else
{
System.out.println("Folder "+ dirPath + " does not exist!");
}
}
/**
* @param args
*/
public static void main(String[] args)
{
FilterFiles object = new FilterFiles();
object.getFiles("c:/projects");
}
} // End of class
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