Solved

Java Web Start & JNLP

Posted on 2001-07-19
12
321 Views
Last Modified: 2012-06-27
Hi everybody!

     I'm using an application with Java Web Start and, of course, I've created a JNLP file.
The problem is that my application use an external text file, and I don't know how to "tell" Java Web Start to download this file too, when I'm starting the application.

I guess the problem is in JNLP's configuration. I don't know how to configure this JNLP file to specify that I need an external resource for my application.

Can anyone help me ?

Thanx a lot.
Sam
0
Comment
Question by:asimion
12 Comments
 
LVL 9

Expert Comment

by:Ovi
ID: 6298102
Why don't you put all files (the app and the txt) in a global .jar file ?
0
 

Expert Comment

by:LG_Goundalkar
ID: 6298105
Hi..
Try this..

import javax.jnlp.*;
    ...

    DownloadService ds;

    try {
        ds = (DownloadService)ServiceManager.lookup("javax.jnlp.DownloadService");
    } catch (UnavailableServiceException e) {
        ds = null;
    }

    if (ds != null) {

        try {
            // determine if a particular resource is cached
            URL url =
                    new URL("http://localhost\file location
            boolean cached = ds.isResourceCached(url, "1.0");
            // remove the resource from the cache
            if (cached) {
                ds.removeResource(url, "1.0");
            }
            // reload the resource into the cache
            DownloadServiceListener dsl = ds.getDefaultProgressWindow();
            ds.loadResource(url, "1.0", dsl);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

LGG

0
 

Author Comment

by:asimion
ID: 6298532
Hi LGG,

     I've tried your code but it doesn't seem to download the file. I don't receive any error but I don't get the file either. How can I know if the download was succesfully and how can I acces the downloade file ?
0
Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

 
LVL 92

Expert Comment

by:objects
ID: 6300538
If you put the file in your jar then you can simply read it using:

InputStream in = ClassLoader.getSystemResourceAsStream("filename.txt");

// Read your file from input stream


0
 

Author Comment

by:asimion
ID: 6301011
I don't want to use the file inside the jar !
I now this way it's working, because the file will be downloaded by JavaWebStart. But I need the file outside the jar because will be modified very often, and I don't want to modify the whole jar every time.
0
 
LVL 92

Expert Comment

by:objects
ID: 6301021
Then you'll need to make it available somewhere for download, as far as I know Web Start doesn't support additional resources.
Will check for u.
0
 

Author Comment

by:asimion
ID: 6301035
The txt file is in the same directory with the jar file and the JNLP file on the server.

If I try to download the file like this :

http://servername/filename.txt with any browser, it's working!

So, that mean it's available for download...., isn't it ?
0
 
LVL 92

Expert Comment

by:objects
ID: 6301042
JNLP only supports specifying jars, images, and other jnlp's. So you'll need to jar your external text file for jnlp to grab it.

Something like this:

<resources>
  <jar href="http://abc.com/text.jar"/>
</resources>

Then use the standard getResource methods in your code to access your data.

If you need more info have a look at the JNLP spec.

0
 
LVL 92

Expert Comment

by:objects
ID: 6301046
That does mean its available for download.
0
 
LVL 1

Expert Comment

by:sey7
ID: 6305195
Maybe you can ask Sey again to solve the problem.


Best Regards,   :)
0
 
LVL 5

Expert Comment

by:vemul
ID: 7669629
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
- To be PAQ'ed and points NOT refunded
Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

vemul
Cleanup Volunteer
0
 

Accepted Solution

by:
SpideyMod earned 0 total points
ID: 7714630
per recommendation

SpideyMod
Community Support Moderator @Experts Exchange
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Weekend adv creator 3 36
servlet doXXX methods 3 48
Opening PDF on button click and fill new document 2 35
Glassfish admin console not working 1 10
INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Viewers learn how to read error messages and identify possible mistakes that could cause hours of frustration. Coding is as much about debugging your code as it is about writing it. Define Error Message: Line Numbers: Type of Error: Break Down…
The viewer will learn how to implement Singleton Design Pattern in Java.

786 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question