Create a binary file in java

Question

These are the related questions that might cause my question to be closed, even though I specify another question:

Java: How to write binary files? -> Doesn't really cover the point that I am talking about
create a binary file -> Absolutely doesn't cover the point
Editing a binary file in java -> They are talking about offsets and stuff, when I just need to write the data and stop
Binary files in java -> Vague.

And now to the point. I've got a file with a specific extension, to be more exact it's .nbs. I want to create a file and then write the specific data to it.
That might have sounded vague so let me show you the code I have started with.

try {
    File bpdn = new File(getDataFolder() + "song.nbs");
    if (!bpdn.exists()) {
        bpdn.createNewFile();
    }

    FileOutputStream fos = new FileOutputStream(bpdn);

} catch (IOException e) {
    e.printStackTrace();
}

I'll provide you even more details. So I've got a song.nbs file that I have created in the past, for myself. And now, whenever a person runs my application, I want it so there's a new song.nbs file with the exact contents of a file that I have on my PC right now. Therefore, I need to somehow get the bytes of my existing song.nbs and then copy and paste them in my Java application... or is it the way? I neither know how to get the bytes of my own file right now, nor do I know how to write them.

enzo · Accepted Answer · 2021-06-26 17:19:21Z

3

You need to create a resources folder. More info here.

Assuming your project structure is

ProjectName/src/main/java/Main.java

you can create a resources folder inside main/:

ProjectName/src/main/java/Main.java
ProjectName/src/main/resources/

Move your song.nbs you want to read inside resources/:

ProjectName/src/main/java/Main.java
ProjectName/src/main/resources/song.nbs

Now, get the InputStream of song.nbs stored there:

final ClassLoader classloader = Thread.currentThread().getContextClassLoader();
final InputStream is = classloader.getResourceAsStream("song.nbs");

Then, write this input stream to your new file:

final File bpdn = new File(getDataFolder() + "song.nbs");
if (!bpdn.exists()) bpdn.createNewFile();
final FileOutputStream os = new FileOutputStream(bpdn);

byte[] buffer = new byte[1024];
int read;
while ((read = is.read(buffer)) != -1) {
    os.write(buffer, 0, read);
}

answered Jun 26, 2021 at 17:19

enzo

11.6k3 gold badges18 silver badges46 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

LeopardL GD Over a year ago

I don't think you understood. I can't input anything. I just have a file that I want to clone and create whenever a user starts my application. I think I came up with a solution though

enzo Over a year ago

I think you didn't understand my answer. Just put the file A you want to copy in the resources folder, get its bytes using InputStream, create the file B you want to receive the copy and write the original file bytes to it using OutputStream.

John Kugelman Over a year ago

enzo, perhaps you can explain that the resource file will be (should be) compiled into the application's JAR file and won't need to be distributed separately.

enzo Over a year ago

Yes, you're correct. The file you want to copy will be available to be read using ClassLoader whenever the user runs your application. You can read more about it in Accessing Resources.

John Kugelman · Accepted Answer · 2021-06-26 17:27:59Z

-1

I think I came up with a solution, but I am not sure if this is works. I'd appreciate if you would take a look.

try {
    File bpdn = new File(getDataFolder() + "badpiggiesdrip.nbs");
    if (!bpdn.exists()) {
        bpdn.createNewFile();
    }

    FileOutputStream fos = new FileOutputStream(bpdn);
    fos.write(new byte[] {
            Byte.parseByte(Arrays.toString(Base64.getDecoder().decode(Common.myString)))
    });

} catch (IOException e) {
    e.printStackTrace();
}

Common.myString is just a string, that contains data of this type:

(byte) 0x21, (byte) 0x5a, .....

and it's encoded in Base64.

edited Jun 26, 2021 at 17:27

John Kugelman

364k70 gold badges555 silver badges600 bronze badges

answered Jun 26, 2021 at 17:23

LeopardL GD

1321 silver badge14 bronze badges

1 Comment

John Kugelman Over a year ago

This works but is not a good solution. Give enzo's answer another look.

Collectives™ on Stack Overflow

Create a binary file in java

2 Answers 2

4 Comments

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related