Sunday, 29 January 2012

File and Folder Selectors in JAVA

There are basically three methods or mechanisms in java which can be used to select files or folders. These are as follow:

1) JFileChooser  :

JFileChooser provides a simple mechanism for the user to choose a file or folder. Here is the hierarchy of JFileChoose class.

java.lang.Object
  extended byjava.awt.Component
      extended byjava.awt.Container
          extended byjavax.swing.JComponent
              extended byjavax.swing.JFileChooser
 
Example :   
 
final JFrame frame = new JFrame();





JFileChooser chooser = new JFileChooser();
 
//If you want any folder or files to be selected by default use this  
//JFileChooser chooser = new JFileChooser("C:\\Users\\sshankar\\Desktop\\ftp");

//To select only folders use this 
//chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); 


//Code to select files of a particular extensions
ExampleFileFilter filter = new ExampleFileFilter();
filter.addExtension("jpg");
filter.addExtension("gif");
filter.setDescription("JPG & GIF Images");
chooser.setFileFilter(filter);

JTextField jTextField1 = new javax.swing.JTextField();

int choice = chooser.showOpenDialog(frame);
 
int returnVal = chooser.showOpenDialog(parent);
if(returnVal == JFileChooser.APPROVE_OPTION) {
     System.out.println("You chose to open this file: " +
            chooser.getSelectedFile().getName());
} 

 
Note : To use ExampleFileFilter class you need to need to include 
ExampleFileFilter.java file.You can download it from here

2) FolderChooser  :  

FolderChooser provides a simple mechanism for the user to choose a folder.

In addition to supporting the basic folder choosing function, it also supports create new folder, delete an existing folder. Another useful feature is recent list. It allows you to set a list of recent selected folders so that user can choose them directly instead of navigating to it in the file system tree.

Following is the hierarchy of FolderChooser class.

java.lang.Object
  extended by java.awt.Component
      extended by java.awt.Container
          extended by javax.swing.JComponent
              extended by javax.swing.JFileChooser
                  extended by com.jidesoft.swing.FolderChooser

Example : 


final JFrame frame = new JFrame();

FolderChooser chooser = new FolderChooser("C:\\Users\\sshankar\\Desktop\\shiv");
 
int returnVal = chooser.showOpenDialog(frame);
if(returnVal == FolderChooser.APPROVE_OPTION) {
       System.out.println("You chose to open this file: " +      
                                             chooser.getSelectedFile().getName());
}

3) JDirectoryChooser :

JDirectoryChooser also provides the mechanism for the user to choose a folder. 
A fix to JFileChooser that correctly allows only directories to be selected. Does the trick by accepting "." as selection of the currently displayed directory. 

Following is the hierarchy of JDirectoryChooser class.

java.lang.Object
  extended by java.awt.Component
      extended by java.awt.Container
          extended by javax.swing.JComponent
              extended by javax.swing.JFileChooser
                  extended by se.datadosen.component.JDirectoryChooser


Example :

final JFrame frame = new JFrame();

JDirectoryChooser chooser = new JDirectoryChooser("C:\\Users\\sshankar\\Desktop\\shiv");

int choice = chooser.showOpenDialog(frame);

if(returnVal == FolderChooser.APPROVE_OPTION) {
           System.out.println("You chose to open this file: " + 

                                        chooser.getSelectedFile().getName());
}



Key Differences :

1) FolderChooser is slower than both JFileChooser and JDirectoryChooser.

2) JDirectoryChooser provides the additional facility to delete the folder.

3) Appearance of JFileChooser dialog box is different from both JDirectoryChooser and FolderChooser while JDirectoryChooser and FolderChooser dialog boxes almost looks same.

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