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Thread: Using JFileChooser to open and display an image

  1. #1
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    Default Using JFileChooser to open and display an image

    Hey everyone, okay so im pretty new to java, i normally use c but now im learning java...

    What i need to do is open and select an image then display it the panel but am not sure how to do this..

    this is what i have so far:
    import java.io.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.awt.image.*;
    import java.awt.print.*;
    import javax.swing.*;
    import javax.swing.filechooser.*;
    import javax.imageio.*;
     
     
    public class assignment1 extends JPanel implements ActionListener {
    	JLabel label = new JLabel();
    	JMenuItem openItem, quitItem;
    	BufferedImage image = null;
     
    	public static void main(String[] args) {
    		new assignment1();
    	}
    	public void actionPerformed(ActionEvent event) {
    		JMenuItem source = (JMenuItem)event.getSource();
     
    	if (source == openItem){
    		JFileChooser chooser = new JFileChooser();
    		chooser.setAcceptAllFileFilterUsed(false);
          chooser.setFileFilter(new ImageFilter());
    		int retVal = chooser.showOpenDialog(this);
    		if (retVal == JFileChooser.APPROVE_OPTION) {
    				File myFile = chooser.getSelectedFile();
    				try {
    					image = ImageIO.read(myFile);
    				}
    				catch( IOException e ){ 
                e.printStackTrace(); 
    				}
    		}
    	}	
    	else if (source == quitItem){
    		System.out.println("Quitting....");
    		System.exit(0);
    	}
    }
     
     
    	public assignment1(){
    		JFrame frame = new JFrame("make window");
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame.setSize(400,200);
    		//JPanel panel = new JPanel();
     
    		//add menu bar.
    		JMenuBar menuBar = new JMenuBar();
    		frame.setJMenuBar(menuBar);
     
     
    		//FILE MENU !!
    		JMenu fileMenu = new JMenu("File");
    		menuBar.add(fileMenu);
     
    		//OPEN ITEM TOOL
    		openItem = new JMenuItem("Open");
    		openItem.addActionListener(this);
    		fileMenu.add(openItem);
     
    		//CLOSE ITEM TOOL
    		quitItem = new JMenuItem("Quit Item");
    		quitItem.addActionListener(this);
    		fileMenu.add(quitItem);
    		frame.setVisible(true);
    		ImageDemo panel = new ImageDemo();
    		frame.setContentPane(panel);
    		//	JPanel panel = new JPanel();
    	//	panel.setVisible(true);
    	}
    		public void paintComponent( Graphics g ){
    			if( image != null ){
    				Graphics2D g2 = (Graphics2D)g;
    				System.out.println("Calling paint");
    				g2.drawImage( image, 0, 0, null );
    			}
    		}
    }
    Last edited by helloworld922; July 31st, 2010 at 09:18 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Using JFileChooser to open and display an image

    There are several parts to your problem. Which are you having trouble with?
    Get the path to a file using JFileChooser
    Read the file from the path as an image
    Display the image in a JPanel.

    Work on each of these steps one at a time and test/show the results using println() and then move to the next step.

  3. #3
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    Default Re: Using JFileChooser to open and display an image

    Quote Originally Posted by Norm View Post
    There are several parts to your problem. Which are you having trouble with?
    Get the path to a file using JFileChooser
    Read the file from the path as an image
    Display the image in a JPanel.

    Work on each of these steps one at a time and test/show the results using println() and then move to the next step.
    I am able to select the file from the dialog box i want to know how to store that image in a buffer or somthing then display it under my menubar. thxs.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Using JFileChooser to open and display an image

    Look at the ImageIO class. It has methods for reading image files into Images.

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