http://www.google.de/search?hl=de&q=pdf+viewer+java&btnG=Google-Suche&meta=

You are going about it the hard way.  Look at:

< http://www.javaworld.com/javaworld/javatips/jw-javatip66.html>

This code is austensibly to open a url in a browser, but on Windows it will
open any file type using the application registered for that file type
(including PDF!!).

I have augmented the code to work on Mac OS X.  Here is the final version:

import java.io.*;
import java.net.*;

/**
* A simple, static class to display a URL in the system browser.
*
*
*
* Under Unix, the system browser is hard-coded to be 'netscape'.
* Netscape must be in your PATH for this to work.  This has been
* tested with the following platforms: AIX, HP-UX and Solaris.
*
*
*
* Under Windows, this will bring up the default browser under windows,
* usually either Netscape or Microsoft IE.  The default browser is
* determined by the OS.  This has been tested under Windows 95/98/NT.
*
*
*
* Examples:
*
*
*     BrowserControl.displayURL("http://www.javaworld.com")
*
*     BrowserControl.displayURL("file://c:\\docs\\index.html")
*
*     BrowserContorl.displayURL("file:///user/joe/index.html");
*
*
* Note - you must include the url type -- either "http://" or "file://".
*
* Taken from JavaWorld Tip #66 by Steven Spencer
*
*/

public class BrowserControl
{
   // Used to identify the windows platform.
   private static final String WIN_ID = "Windows";
   // Used to identify the mac platform.
   private static final String MAC_ID = "Mac";
   // 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();
       boolean mac = isMacPlatform();
       String cmd = null;
       // Different OS's and Java versions pass different things as the
       // file: url.  We need to get it in the form of file:/// for it to
       // launch correctly on all platforms.
       if (url.indexOf("file:///") == 0)
       {
           //everything is fine
       }
       else if (url.indexOf("file://") == 0)
           url = Utility.replaceAll("file://", "file:///", url);
       else if (url.indexOf("file:/") == 0)
           url = Utility.replaceAll("file:/", "file:///", url);
       else if (url.indexOf("file:") == 0)
           url = Utility.replaceAll("file:", "file:///", url);
       
       if (isMacPlatform())
       {
           url = Utility.replaceAll(" ", "%20", url);
       }
       if (url.startsWith("file:"))
           url = Utility.replaceAll("?", "%3F", url);
       //System.out.println("displaying: " + url);
       try
       {
           if (windows)
           {
               // cmd = 'rundll32 url.dll,FileProtocolHandler http://...'
               cmd = WIN_PATH + " " + WIN_FLAG + " " + url;
               Process p = Runtime.getRuntime().exec(cmd);
           }
           else if (mac)
           {
            Runtime.getRuntime().exec(new String[] {"open", url });
           }
           else
           {
               String browser = System.getProperty("BrowserCmd");
               if (browser != null)
               {
                   Runtime.getRuntime().exec(new String[] {(String) browser,
url });
               }
               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.javaworld.com)'
                   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.javaworld.com'
                           cmd = UNIX_PATH + " " + url;
                           p = Runtime.getRuntime().exec(cmd);
                       }
                   }
                   catch(InterruptedException e)
                   {
                       System.err.println("Error bringing up browser, cmd='"
+
                                          cmd + "'");
                       System.err.println("Caught: " + e);
                   }
               }
           }
       }
       catch (IOException e)
       {
           // couldn't exec browser
           System.err.println("Could not invoke browser, command=" + cmd);
           System.err.println("Caught: " + e);
       }
   }

   
   /**
    * 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;
   }

   public static boolean isMacPlatform()
   {
       String os = System.getProperty("os.name");
       if ( os != null && os.startsWith(MAC_ID))
           return true;
       else
           return false;
   }

   
   /**
    * Simple example.
    */
   public static void main(String[] args)
   {
       displayURL("http://www.javaworld.com");
   }

}

3 more suggestions:

1. Go to http://www.jpedal.org/pdfviewer.html and
pay lots of money for something that works pretty
well.

2. Treat it as a URL (see post by Bill Tschumy)

3. Give up on PDFs and use something else. I moved
over to xsl:fo and used fop, but I only needed to
view reports that I'd generated, not 3rd party ones.
ymmv,

Richard

hi,

i'm french so i'm sorry for my english. i noticed that we work in the
same project. indeed we want to display pdf files by using java program.
we did some researchs and we found nothing usefull that allow us to
create our own program. we found many examples about the creation of pdf
files by using java, but nothing about the displaying. Now i have no
news, but if i find something we'll send it to you and i hope you'll do
the same for me.

see you online
jolyqr