Accessing a PDF in Jar

I'm crea开发者_如何学Goting a Java application using Netbeans. From the 'Help' Menu item, I'm required to open a PDF file. When I run the application via Netbeans, the document opens, but on opening via the jar file, it isn't opening. Is there anything that can be done?

m_aboutItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
           Runtime rt = Runtime.getRuntime();
                URL link2=getClass().getResource("/newpkg/Documentation.pdf");
                String link=link2.toString();
                link=link.substring(6);
                System.out.println(link);
                System.out.println(link2);
                String link3="E:/new/build/classes/newpkg/Documentation.pdf";
                try {
                Process proc = rt.exec("rundll32.exe url.dll,FileProtocolHandler " + link3);
            } catch (IOException ex) {
                Logger.getLogger(Menubar1.class.getName()).log(Level.SEVERE, null, ex);
            }

        }
    });

The two outputs are as follows:

E:/new/build/classes/newpkg/Documentation.pdf
file:/E:/new/build/classes/newpkg/Documentation.pdf

Consider the above code snippet. On printing 'link',we can see that it is exactly same as the hard coded 'link3'. On using the hard coded 'link3' , the PDF file gets opened from jar application. But when we use link, though it is exactly same as 'link3', the PDF doesn't open.

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This is most likely related to the incorrect PDF resource loading. In the IDE you have the PDF file either as part of the project structure or with a directly specified relative path. When a packaged application is running it does not see the resource.

EDIT: Your code reveals the problem as I have described. The following method could be used to properly identify resource path.

public static URL getURL(final String pathAndFileName) {
    return Thread.currentThread().getContextClassLoader().getResource(pathAndFileName);
}

Pls refer to this question, which might provide additional information.

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Try out this:

m_aboutItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        if (Desktop.isDesktopSupported()) {
        Desktop desktop = Desktop.getDesktop();
        URL link2=Menubar1.class.getResource("/newpkg/Documentation.pdf");
            String link=link2.toString();
            link=link.substring(6);
            System.out.println(link); 
        File file=new File(link);
        System.out.println(file);
            try {
                desktop.open(file);
            } catch (IOException ex) {
                Logger.getLogger(Menubar1.class.getName()).log(Level.SEVERE, null, ex);
            }
        }

    }
});