Write an image from project resources to the byte array [duplicate]

Question

In the project resource files, I have a default image default_image.png. I need to go to him and translate it into an array of bytes.

Image image = new Image("/icons/default_image.png");
URL defaultImageFile = this.getClass().getResource("/icons/default_image.png");
byte[] array = Files.readAllBytes(Paths.get(defaultImageFile.getPath()));

I can take it to the URL as an image, but I can not as a file. How can I refer to this file as an image by URL?

new javax.swing.ImageIcon(getClass().getResource("/icons/default_image.png")), alternatively the Method getResourceAsStream Then use stackoverflow.com/questions/1264709/… . What is your overall goal, why do you want to have bytes? How do you want to use the image? — michaeak
– michaeak, Commented Nov 7, 2018 at 7:11
I encode an image using Base64 and write it as a string to a file String imageAsString = Base64.getEncoder().encodeToString(array); — A1ex NS
– A1ex NS, Commented Nov 7, 2018 at 7:16

michaeak · Accepted Answer · 2018-11-07 23:28:49Z

4

I suggest do the following:

Use commons IO, then:

InputStream is = getClass().getResourceAsStream("/icons/default_image.png")
byte[] bytes = IOUtils.toByteArray(is);

(try and catch the exceptions.)

Edit As of Java 9 no Library needed:

InputStream is = getClass().getResourceAsStream("/icons/default_image.png")
byte[] bytes = is.readAllBytes();

(Again try and catch the exceptions.)

edited Nov 7, 2018 at 23:28

answered Nov 7, 2018 at 7:20

michaeak

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3 Comments

fabian Over a year ago

It's not necessary to use an external library anymore (assuming java 9+ is used): try (InputStream is = getClass.getResourceAsStream()) { byte[] bytes = is.readAllBytes(); ... } ( docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/… )

michaeak Over a year ago

Thansk for the hint, in Java 8 it is still necessary to read the bytes, what you show is Java 11. I don't know what the poster of the question uses.

Slaw Over a year ago

Just to clarify: The method readAllBytes was added in Java 9 but the documentation fabian links is for Java 11 (current LTS release as of this comment).

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