Spring - How to upload image from folder to database

Question

Hello im trying to do something like this:

 private Byte[] getImage() throws IOException {

        String imageUrl = ServletContext.class.getClassLoader()
                .getResource("static/anImage.jpg")
                .getFile();

        Byte[] byteObject = new Byte[imageUrl.getBytes().length];

        int i = 0;
        for (Byte b : imageUrl.getBytes()){
            byteObject[i++] = b;
        }
        return byteObject;
    }

But it's wrong. So how to pick up a file from specific directory? Thanks.

ps. I can do something like this:

 File file = new File("image.jpg");
        byte[] content = Files.readAllBytes(file.toPath());

But still its a path only from the main folder. Dont know how to program for the resources/images folder.

You can read the file as a Resource then get inputstream from resource and covert to bytes — Edgar Khachatryan
– Edgar Khachatryan, Commented Jul 22, 2020 at 14:37
ok. What excatly is the classpath:? Its some kind of folder? resources? — Luker asd
– Luker asd, Commented Jul 22, 2020 at 15:23
Thanks, this is an excelent. I would accept it as an answer if you will post it. — Luker asd
– Luker asd, Commented Aug 21, 2020 at 14:49

Edgar Khachatryan · Accepted Answer · 2020-08-21 15:00:15Z

1

In Spring you can use Resources to achieve your goal:

Resource resource = new ClassPathResource("static/anImage.jpg"); 
byte[] bytes = resource.getInputStream().readAllBytes();

answered Aug 21, 2020 at 15:00

Edgar Khachatryan

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Comments

Paweł Radziun · Accepted Answer · 2020-07-22 14:34:09Z

1

Don't reinvent the wheel and use e.g. Apache Commons for convert a File to byte array. Read more FileUtils.readFileToByteArray(File input)

The way you loading resources seems to be the proper one.

Ensure that the loaded file is in proper location (src/main/resources).

Do you have any particular error or stack trace which describes the issue.

edited Jul 22, 2020 at 14:34

answered Jul 22, 2020 at 14:27

Paweł Radziun

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5 Comments

Luker asd Over a year ago

Dzięki za pomoc, będę pisał po ang, żeby każdy rozumiał. Thanks, didnt know something like FileUtils exists. It works good. But the problem is i dont know how to load file from the location like resources/static. The Servlet context doesnt work. So im looking for a way to pick files from directories.

Paweł Radziun Over a year ago

What does "The Servlet context doesnt work" mean? Do you have any exceptions?

Luker asd Over a year ago

There are no exceptions. But the image isnt being uploaded and cant be displayed on the browser. The reason is beacause the imageUrl.getBytes().length carries array of only 84 elements. But when i use File file = new File("image.jpg"); and the image is in the projects main folder i can display it in the browser, it works and its array carries around 200.000 elements. So i still cant load an image from a different path.

Paweł Radziun Over a year ago

Now I see. imageUrl is String so you have bytes from string with path. Try to change imageUrl form string to file: File fimageUrl = new File( getClass().getClassLoader().getResource("database.properties").getFile() ); and it should start working.

Luker asd Over a year ago

I get java.io.FileNotFoundException: File 'C:\Moje\IntelliJ%202020.1.2\WORK\projekt\shopBackend\target\classes\static\gow2.jpg' does not exist Still i see the jpg in target/classes/ static. Ill try the thing with classpath and resources that Edgar wrote

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