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Java Client Applet - Storing it AppData

Posted on 2010-08-17
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Last Modified: 2012-05-10
If you're using Windows (and why?), you'll know when you play Java Applet games that they store their data locally to load faster when you play them again and again.

For example - take this image:
 Loading up .jar fiels, sound files, and image files!See the jar files? Inside those folders are also mp3 files.
This is the game: http://minecraft.net/game/

How do I do this for my java applet?
I have tried google but alas -- no help.

Thank you.
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Question by:UrbanTwitch
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Expert Comment

by:objects
ID: 33461269
if its an applet then theres nothing you really need to do. resources should get cached automatically for you.
For resurces like images/audio its often a good idea to jar them up so its just one download
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Author Comment

by:UrbanTwitch
ID: 33461357
oh so then how would i tell the jar file to download those inside the jar file instead from the internet?
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Expert Comment

by:objects
ID: 33461389
theres no need to have them available anywhere but the jar so you don't need to specify which to use
To get the URL of a resource in a jar use the Class.getResource() method

http://helpdesk.objects.com.au/java/how-to-get-url-to-a-resource-in-same-directory-as-a-class
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Author Comment

by:UrbanTwitch
ID: 33461399
So where would I put the new URL i formed... inside replacing the tile%.png?
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Expert Comment

by:objects
ID: 33461451
you already use getResource()


                        tiles[i] = ImageIO.read(getClass().getResource(
                                    String.format("line_tile/t%d.png", i)));

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Author Comment

by:UrbanTwitch
ID: 33461459
wait wait wait *scratches head*... so I am already using it?
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Expert Comment

by:objects
ID: 33461477
so in your case you need to include the line_tile (and any other resources) in your jar
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Author Comment

by:UrbanTwitch
ID: 33461527
So it would be like this.
Correct?
URL tile[i] = MyClass.class.getResource(String.format("line_tile/t%d.png", i));

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Expert Comment

by:objects
ID: 33461534
yes
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Author Comment

by:UrbanTwitch
ID: 33461547
Wait... so then how do I draw a URL? :S
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Accepted Solution

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objects earned 500 total points
ID: 33461616
You're already reading a url and displaying it

http://helpdesk.objects.com.au/java/how-do-i-read-an-image-from-a-url
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Author Comment

by:UrbanTwitch
ID: 33461645
I changed
Image[] tiles;
to
URL[] tiles;

I then added import java.net.URL; with the other imports

and then I have this:

                  tiles = new URL[NUM_TILES];
                  for (int i = 0; i < NUM_TILES; i++) {
                                tiles[i] = tileGen.class.getResource(String.format("line_tile/t%d.png", i));
                      //tiles[i] = ImageIO.read(getClass().getResource(String.format("line_tile/t%d.png", i)));
                  }

and now I am getting this:

C:\wamp\www\mystikrpg\tileGen.java:994: cannot find symbol
symbol  : method drawImage(java.net.URL,int,int,tileGen.GamePanel)
location: class java.awt.Graphics
                              g.drawImage(tiles[index], 32 * col, 32 * row, this);
                               ^
1 error

Tool completed with exit code 1

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Author Comment

by:UrbanTwitch
ID: 33461659
Wait I think i found it out:
This look good?
tiles = new Image[NUM_TILES];
                  for (int i = 0; i < NUM_TILES; i++) {
					  Toolkit tk = this.getToolkit();
					  		tiles[i] = tk.getImage(this.getClass().getResource(String.format("line_tile/t%d.png", i)));
}

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Expert Comment

by:objects
ID: 33461661
you didn't need any code change :)

> so in your case you need to include the line_tile (and any other resources) in your jar
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Author Comment

by:UrbanTwitch
ID: 33461705
OK so now it loads up a lot faster. Around 10 seconds or so.


(we're getting here! ... time for a new Q!)
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