urgent guidance required to access image using class navigation

Newbie & Debugging Questions
#1

hello , in the program that i am developping, i have to access a list of files within the package of the project. it runs well when i run the program within eclipse but when i export it to a runnable jar, it seems that the path for my image folder changes.
From research i ended with solutions like using Class.getResource
or get ResourceStream
which i have never used before and it seems that i am not being able to implement it.

plz its urgent help my image folder and Class(which call the images) is as follows.
followed by my code extract.

http://s25.postimg.org/fv4mkxazz/location.png

http://s25.postimg.org/df2t72sxb/code_extract.png

plzz help me out, i got to submit an executable jar in less than 5 hours

#2

Can’t use File() when getting stuff from inside a jar, as the jar is actually a zip, and the “files” inside aren’t actually files.
You have to work with InputStreams:


buffImg = ImageIO.read(ThumbnailsList.class.getClassLoader().getResourceAsStream("jp/images/thing.png"));
#3

Don’t use Files, if your resource is not in a File.

#4

okay how to access all the images in the folder(or package) then… i dont really knw how to access ALL the images from the folder.
my next instruction is to loop over all the images and add them in an array.

#5

either hardcode the filenames, or create a pattern to your file names:


jp/images/sprite-1.png
jp/images/sprite-2.png
jp/images/sprite-3.png
jp/images/sprite-4.png
jp/images/sprite-5.png



for(int i=0; i<5; i++) {
   String path = "jp/images/sprite-"+(i+1)+".png";
   buffImgs[i] = ImageIO.read(ThumbnailsList.class.getClassLoader().getResourceAsStream(path));
}
#6

okay thanks :slight_smile:
i take it that we cannot do it in a dynamically way… (without knowing the file names)

i think i’ll save the filenames in a text file and then read it through the stream. and recover the images.

#7

You can do it, but you’ll have to iterate over the contents of a JAR/ZIP, with ZipInputSteam