Java: Read image from current src directory

Question

I would like to load an image from my current src directory where the java class files are located as well. However, I always get an IOException..

And how can I make sure the file gets loaded properly on Mac/Linux as well on Windows?

My code so far:

String dir = System.getProperty("user.dir") + "/Logo_transparent.png";
File imageFile = new File(dir);
BufferedImage bufferedImage = null;

try {
    bufferedImage = ImageIO.read(imageFile);
} catch (IOException e) {
    System.out.println(e.getMessage());
    System.out.println(dir);
    System.out.println();
}

IOException message:

Can't read input file!

(My path is correct - is it because of the space between Google and Drive?)

/Users/myMac/Google Drive/Privat/Programming/Logo_transparent.png

Kind regards and thank you!

Can you do `System.out.println(dir);` and tell us what it returns — SamHoque, Dec 12 '18 at 10:59
Return of that is: "/Users/myMac/Google Drive/Privat/Programming" — Jan, Dec 12 '18 at 10:59
okay can you do `System.out.println(imageFile.exists());` and see what that returns? — SamHoque, Dec 12 '18 at 10:59
@Jan, the question seems to be incorrect: you're saying that you want to get this image from src directory, but referring us to `/Users/myMac/Google Drive/Privat/Programming/Logo_transparent.png`. Clarify what exactly you want to do? — Sergey Prokofiev, Dec 12 '18 at 12:12
`ImageIO.read` will throw this specific exception only in one case, that is when the input file is not readable (as in `!file.isReadable()`) by the Java process. Usually, this means you have to change the file access rights of your file (and/or parent folders). Could also be that the Java process is running under the wrong user. — Harald K, Dec 12 '18 at 12:22

SamHoque · Answer 1 · 2018-12-12T11:03:25.227

0

I think It's because you didn't create the file, You can create the file if it doesn't exist by using this code

if(!imageFile.exists()) imageFile.createNewFile();

You're code will look like this

String dir = System.getProperty("user.dir") + "/Logo_transparent.png";
File imageFile = new File(dir);
BufferedImage bufferedImage = null;
try {
    if(!imageFile.exists()) imageFile.createNewFile();
    bufferedImage = ImageIO.read(imageFile);
} catch (IOException e) {
    System.out.println(e.getMessage());
    System.out.println(dir);
    System.out.println();
}

Also you shouldn't concat child files like that instead pass it as a second argument.

File imageFile = new File(System.getProperty("user.dir"), "Logo_transparent.png");

edited Dec 12 '18 at 11:03

answered Dec 12 '18 at 11:00

SamHoque

2,978
2
13
43

It exists, I can see it in my Finder! – Jan Dec 12 '18 at 11:02
Can you still run the following code and see if it still shows error? – SamHoque Dec 12 '18 at 11:02
@SamzSakerz, logic is incorrect, you're checking if file exists you will re create it. You forgot negation – Sergey Prokofiev Dec 12 '18 at 11:03
@SergeyProkofiev sorry, I haven't slept for 50+ hours – SamHoque Dec 12 '18 at 11:03
@SamzSakerz Why would you ever try to read an image from a newly created, empty file? – Harald K Dec 12 '18 at 14:25

score 0 · Answer 2 · answered Dec 12 '18 at 13:11

If your image files will be packaged together with your class files (for example in the same .jar) you should not use File but read it as a resource:

bufferedImage = ImageIO.read(this.getClass().getResourceAsStream("/Logo_transparent.png"));

Notice the '/' before the file name. This means to search in the root path of the classpath. If you specify without / it will search in the package of this (the current class)

this.getClass().getResourceAsStream("Logo_transparent.png")

score -1 · Answer 3 · answered Dec 12 '18 at 11:04

-1

You can try to build the absolute path to the image like here and read it afterward.

answered Dec 12 '18 at 11:04

awgold90

72
13

This wasn't the question. Read the title. – SamHoque Dec 12 '18 at 11:06

Java: Read image from current src directory

3 Answers3