I need a simple solution for loading jars that contain additional image and audio files while my applet/application is already running. The ideal solution will probably be to create a manager to check if a jar has already been loaded, butfor right now I need the code that will do the load. I don't know if the load should be something I do from the app logic by anticipating when the resources will be needed, or should the load be embedded in the following code when the attempt is made to load the resource.
My image loading code currently looks like this:
URL url = getClass().getResource(fil
BufferedImage sourceImage = ImageIO.read(url);
GraphicsConfiguration gc = GraphicsEnvironment.getLoc
getDefaultConfiguration();
Image image = gc.createCompatibleImage(s
Transparency.BITMASK);
image.getGraphics().drawIm
My audio loading code currently looks like this:
URL url = getClass().getResource(fil
AudioInputStream audioStream = AudioSystem.getAudioInputS
// get the number of bytes to read
int length = (int) (audioStream.getFrameLengt
// read the entire stream
byte[] samples = new byte[length];
DataInputStream is = new DataInputStream(audioStrea
try {
is.readFully(samples);
is.close();
}
catch (IOException ex) {
ex.printStackTrace();
}
By the way, code to unload jars to free up memory would be much appreciated as well.
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
The below piece of code will help you to load the required resource from a jar.
String jarName = "c:/jar/jar1.jar";
URLClassLoader urlLoader = getURLClassLoader(new URL("file", null, jarName));
JarInputStream jis = new JarInputStream(new FileInputStream(jarName));
JarEntry entry = jis.getNextJarEntry();
while (entry != null) {
String name = entry.getName();
if (name.endsWith(".class")) {
name = name.substring(0, name.length() - 6);
name = name.replace('/', '.');
System.out.print(name);
try {
urlLoader.loadClass(name);
} catch (Throwable e) {
}
}
entry = jis.getNextJarEntry();
}
You can load the files directly from the jar:
URL url = new URL("jar:file:sounds.jar!/
AudioInputStream audioStream = AudioSystem.getAudioInputS
>>By the way, code to unload jars to free up memory would be much appreciated as well.
You don't need to unload jars - they're not 'loaded' in the first place - only classes are. You only need to close ' audioStream' then set it to null if you need to prompt the garbage collector
Business Accounts
Answer for Membership
by: sciuriwarePosted on 2007-09-29 at 23:06:17ID: 19986342
Why should additional files be in an extra .jar?
1) put them in the primary jar as resource.
2) open and load them as necessary.
I don't see the advantage of an extra jar for data files.
;JOOP!