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Opening default browser E-mail
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Opening default browser in Java can be done using the following BrowserControl class. To be able to run it with different browsers in Linux , you just need to change UNIX_PATH and UNIX_FLAG parameters.(Note that you don't need to change anyting for windows)

import java.io.IOException;

public class BrowserControl {
    
    // Used to identify the windows platform.
    private static final String WIN_ID = "Windows";
    // The default system browser under windows.
    private static final String WIN_PATH = "rundll32";
    // The flag to display a url.
    private static final String WIN_FLAG = "url.dll,FileProtocolHandler";
    // The default browser under unix.
    private static final String UNIX_PATH = "netscape";
    // The flag to display a url.
    private static final String UNIX_FLAG = "-remote openURL";
    
    /**
     * Display a file in the system browser.  If you want to display a
     * file, you must include the absolute path name.
     *
     @param url the file's url (the url must start with either "http://"
     * or
     * "file://").
     */
    public static void displayURL(String url) {
        boolean windows = isWindowsPlatform();
        String cmd = null;
        try {
            if (windows) {
                // cmd = 'rundll32 url.dll,FileProtocolHandler http://...'
                cmd = WIN_PATH + " " + WIN_FLAG + " " + url;
                Process p = Runtime.getRuntime().exec(cmd);
            else {
                // Under Unix, Netscape has to be running for the "-remote"
                // command to work.  So, we try sending the command and
                // check for an exit value.  If the exit command is 0,
                // it worked, otherwise we need to start the browser.
                // cmd = 'netscape -remote openURL(http://www.java-tips.org)'
                cmd = UNIX_PATH + " " + UNIX_FLAG + "(" + url + ")";
                Process p = Runtime.getRuntime().exec(cmd);
                try {
                    // wait for exit code -- if it's 0, command worked,
                    // otherwise we need to start the browser up.
                    int exitCode = p.waitFor();
                    if (exitCode != 0) {
                        // Command failed, start up the browser
                        // cmd = 'netscape http://www.java-tips.org'
                        cmd = UNIX_PATH + " "  + url;
                        p = Runtime.getRuntime().exec(cmd);
                    }
                catch(InterruptedException x) {
                    System.err.println("Error bringing up browser, cmd='" +
                            cmd + "'");
                    System.err.println("Caught: " + x);
                }
            }
        catch(IOException x) {
            // couldn't exec browser
            System.err.println("Could not invoke browser, command=" + cmd);
            System.err.println("Caught: " + x);
        }
    }
    /**
     * Try to determine whether this application is running under Windows
     * or some other platform by examing the "os.name" property.
     *
     @return true if this application is running under a Windows OS
     */
    public static boolean isWindowsPlatform() {
        String os = System.getProperty("os.name");
        if os != null && os.startsWith(WIN_ID))
            return true;
        else
            return false;
        
    }
}

You can use this class with different kind of documents as follows:

  • BrowserControl.displayURL("http://www.java-tips.org");
  • BrowserControl.displayURL("file://c:\\docs\\index.html");
  • BrowserContorl.displayURL("file:///user/joe/index.html");

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