Description
Swing FileChooser, Swing component is an object having a graphical representation that can be displayed on the screen and that can interact with the user. Examples of components are the buttons, checkboxes, and scrollbars of a typical graphical user interface. Swing components are fundamental building pieces of an application. Swing FileChooser is a component which gives a functionality to select the data from the system. Following is an example which describes more about this concept.
Example
Following is an example for Swing FileChooser from the system.
SimpleFileChooser.java
[java]package splessons;
//SimpleFileChooser.java
//A simple file chooser to see what it takes to make one of these work.
//
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class SimpleFileChooser extends JFrame {
public SimpleFileChooser() {
super("SPLesson - File Chooser Test Frame");
setSize(350, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
Container c = getContentPane();
c.setLayout(new FlowLayout());
JButton openButton = new JButton("Open");
JButton saveButton = new JButton("Save");
JButton dirButton = new JButton("Pick Dir");
final JLabel statusbar =
new JLabel("Output of your selection will go here");
// Here Create a file chooser that opens up as an Open dialog
openButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JFileChooser chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(true);
int option = chooser.showOpenDialog(SimpleFileChooser.this);
if (option == JFileChooser.APPROVE_OPTION) {
File[] sf = chooser.getSelectedFiles();
String filelist = "nothing";
if (sf.length > 0) filelist = sf[0].getName();
for (int i = 1; i < sf.length; i++) {
filelist += ", " + sf[i].getName();
}
statusbar.setText("You chose " + filelist);
}
else {
statusbar.setText("You canceled.");
}
}
});
// Create a file chooser that opens up as a Save dialog
saveButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JFileChooser chooser = new JFileChooser();
int option = chooser.showSaveDialog(SimpleFileChooser.this);
if (option == JFileChooser.APPROVE_OPTION) {
statusbar.setText("You saved " + ((chooser.getSelectedFile()!=null)?
chooser.getSelectedFile().getName():"nothing"));
}
else {
statusbar.setText("You canceled.");
}
}
});
// Create a file chooser that allows you to pick a directory
// rather than a file
dirButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int option = chooser.showOpenDialog(SimpleFileChooser.this);
if (option == JFileChooser.APPROVE_OPTION) {
statusbar.setText("You opened " + ((chooser.getSelectedFile()!=null)?
chooser.getSelectedFile().getName():"nothing"));
}
else {
statusbar.setText("You canceled.");
}
}
});
c.add(openButton);
c.add(saveButton);
c.add(dirButton);
c.add(statusbar);
}
public static void main(String args[]) {
SimpleFileChooser sfc = new SimpleFileChooser();
sfc.setVisible(true);
}
}[/java]
Create a class that should extend JFrame.
[java]public class SimpleFileChooser extends JFrame {
public SimpleFileChooser() {
super("SPLesson - File Chooser Test Frame");
setSize(350, 200);[/java]
Create the container.
[java]Container c = getContentPane();[/java]
Set the logic at status bar.
[java]statusbar.setText("You opened " + ((chooser.getSelectedFile()!=null)?
chooser.getSelectedFile().getName():"nothing"));[/java]
Output
When compile the program following is the output will be displayed.
When click on open following output will be displayed.
Points
setDefaultCloseOperation(EXIT_ON_CLOSE); to close the operation done user.