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Thread: Opening a file with a java program

  1. #1
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    Default [SOLVED] Opening a file with a java program

    Hi, beginner java programmer here

    How do I open a file with a java program? Search results return people trying to open a file with streams, or native applications and command lines and such; this is not what I want.

    What I want, is to be able to double-click, say, an image on the desktop then have it open in my java image viewer.

    I've gotten so far as to load an image from a command line argument, but that means I need to use the command prompt or a batch file for it to work...

    Thanks.
    Last edited by hafunui; March 1st, 2011 at 03:53 PM.


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    Default Re: Opening a file with a java program

    This is an OS problem as opposed to a java problem. For each OS you need to associate the file with the application, which can be relatively easy or relatively hard depending upon the OS. Alternatively, a user could define the application to open the file with using a simple right click and defining your application.

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    Default Re: Opening a file with a java program

    I've managed to associate the .jar with a file, but the program does not launch. Here's some code.

    package simpleImageViewer;
     
    import javax.swing.ImageIcon;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.SwingUtilities;
     
    public class Main extends JFrame{
     
    	public String source = null;
    	public JPanel stage = null;
     
    	public Main(String src) {
    		source = src;
     
    		add(stage = new JPanel());
    		stage.add(new JLabel(new ImageIcon(source)));
     
    		this.pack();
    		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    		this.setLocationRelativeTo(null);
    		this.setVisible(true);
    	}
     
        public static void main(final String[] args) {
    		SwingUtilities.invokeLater(new Runnable() {
    			public void run() {
    				Main m = new Main(args[0]);
    			}
    		});
        }
     
    }

    I think, perhaps, I am making assumptions on what is being passed as the parameter to main(). I've assumed a path to the file is being passed, but this probably isn't the case, is it?

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    Default Re: Opening a file with a java program

    Sorry to bump, but I still haven't figured this out yet.

    To reiterate, what I'm trying to do is to open a file by dragging it over MyJavaApp.jar, or in windows (MyFile > open with > MyJavaApp.jar).
    What I've assumed was to happen is that the file path is passed to the application as an argument to the main method, but my app doesn't even start up.

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    Default Re: Opening a file with a java program

    Ok, I was looking into batch scripts and I found out I can do this:

    "C:\Program Files\Java\jre6\bin\javaw.exe" -Xms64M -Xmx4G -jar "C:\path\to\myApp.jar" %*

    I just open my file with the .bat file, which then passes it to the .jar.
    This solution is good enough for my current needs

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