Java images loaded in ide but not built jar
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Java images loaded in ide but not built jar
I have my file path as follows:
+------------+ +-----------------+ +------------------+
| | | | | |
| src +-----------> com +--+---> application |
| | | | | | |
+------------+ +-----------------+ | +------------------+
|
| +------------------+
| | |
+---> resources |
| |
+------------------+
My code is in the application folder and my pictures that I want to load are in resources.
Im using the following code to get the images from resources onto a class in application (image is a BufferedImage).
image = ImageIO.read(new File("./src/com/resources/Pad.png"));
This seems to work in my IDE (intellij) as I can see the loaded images as shown
However, when I build, the images aren't being shown. I'm building by:
File -> Project Structure -> Artifacts -> Green plus -> JAR -> From modules with dependencies -> my main class location -> Extract to target Jar
Then I Build Artifact -> Build.
So when I go to the destination of the built jar and run it none of the pictures are being shown
I checked to see if the images were in the built jar by extracting the jar which does contain the pictures but for some reason the code isn't loading the picture.
ImageIO
javax.imageio
it is
import javax.imageio.ImageIO;– NotSoVisualBasic
Jul 2 at 20:21
import javax.imageio.ImageIO;
Never, ever reference
src in your code - for just the reasons you are now having– MadProgrammer
Jul 2 at 20:26
src
2 Answers
2
You can try to use resourse as a stream instead of file.
image = ImageIO.read(this.getClass().getClassLoader().getResourceAsStream("com/resources/Pad.png"))
This has solved it thanks. the stream seems to make it work, do you know why it works as a stream but not when I use a File?
– NotSoVisualBasic
Jul 2 at 20:25
@NotSoVisualBasic Do you understand what a Jar file is? It's just a Zip based file. So when you "Jar" your project, all the files are stored inside a single binary file, this means the "files" can no longer be accessed via the file system (because they don't exist), instead, you need to make use of the API to find and load those resources which are embedded in the Jar file (or, as a neat side affect here, within the class path)
– MadProgrammer
Jul 2 at 20:27
Yeah I understood that a jar file was like a zipped folder but I didn't realise after building you wouldn't be able to access the files like you would if the program was being developed in an IDE. Thanks for the explanation though!
– NotSoVisualBasic
Jul 2 at 20:32
The src path is not available in build jar. You should use class loader to load resources from classpath. E.g. (assuming that 'src' is classpath root)
image = ImageIO.read(new File(this.getClass()
.getResource("com/resources/Pad.png").getPath());
Edited with the @MadProgrammer suggestion.
This didn't work for me I used:
image = ImageIO.read(new File(this.getClass().getClassLoader().getResource("com/resources/Pad.png").getPath())); since File wouldn't use URL, and the built jar doesnt have the pics shown.– NotSoVisualBasic
Jul 2 at 19:53
image = ImageIO.read(new File(this.getClass().getClassLoader().getResource("com/resources/Pad.png").getPath()));
The question is: What is your claspath root?
– piradian
Jul 2 at 20:00
I fixed the sample code by adding
.getPath()– piradian
Jul 2 at 20:03
.getPath()
I don't know, how would I find it?
– NotSoVisualBasic
Jul 2 at 20:04
new File(this.getClass().getClassLoader() .getResource("com/resources/Pad.png") is defunct and pointless. A resource embedded within a Jar file will not be accessible as a File, that's the whole point of using Class#getResource. Also, since ImageIO.read doesn't take a String you're just generating a compiler error - Simple use this.getClass().getResource("...") instead– MadProgrammer
Jul 2 at 20:24
new File(this.getClass().getClassLoader() .getResource("com/resources/Pad.png")
Jar
File
Class#getResource
ImageIO.read
String
this.getClass().getResource("...")
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Please clarify package of
ImageIOclass. Is itjavax.imageio?– Timur Levadny
Jul 2 at 20:16