Read/write to files in root folder with Java

[Claryn]

Hi.

 

I am currently working on a small program where I need to save some information in .txt files. I have earlier used methods like

        Scanner diskScanner = new Scanner(new File("rawData.txt"));        PrintStream diskWriter = new PrintStream("cookedData.txt");

to read and write to the files rawData.txt and cookedData.txt.

Since there is no path assigned, these are then stored in the root-folder of the program, alongside the bin and src folder.

 

I want to make a folder called data inside the root-folder, so that this program will work on any machine.

I know I can simply specify the folder in which the files are, but then that needs to be changed for every individual computer that launches the program.

A method like this does it easily:

PrintStream diskWriter = new PrintStream ("c:/Users/Public/Documents/cookedData.txt");

 

 

but is there a way to tell it to access the folder data in the root folder, so that it will always find the folder, no matter what machine it is installed on.

 

Thanks.

[Xenift]

In html its (../)

 

-EDIT-

My teachers were all like, IF YOU MAKE YOUR DIRECTORY ROUTE STATIC WE GONNA WACK YOUR ASS.

So I remembered :3

[Claryn]

In html its (../)

 

Might have been unclear, but this is for Java!

[Xenift]

Might have been unclear, but this is for Java!

 

My bad, here I found this

http://www.dotnetperls.com/path

[Nuluvius]

My bad, here I found this

http://www.dotnetperls.com/path

 

Are you trolling or are you simply an idiot?

[Xenift]

Are you trolling or are you simply an idiot?

I think I might be an idiot lol.

[Claryn]

On the same matter:

does anyone know if I can read from a specific line in a .txt file with the Scanner method.

[Nineshadow]

./

Should specify the root folder.

Eg.

PrintStream diskWriter = new PrintStream ("./cookedData.txt");

[Claryn]

./

Should specify the root folder.

Eg.

PrintStream diskWriter = new PrintStream ("./cookedData.txt");

 

Thanks. Just confirmed this, and it works!

[Claryn]

Thanks. Just confirmed this, and it works!

 

@Nineshadow

Hang on, now I am having troubles again.

 

In the projects folder I have the src folder and the bin folder. I have now added my data-folder, which contains the file rules.txt.

 

I have tried the following to access it, but I get a FileNotFountException:

        File file = new File( "./data/rules.txt");

[Nineshadow]

 

@Nineshadow

Hang on, now I am having troubles again.

 

In the projects folder I have the src folder and the bin folder. I have now added my data-folder, which contains the file rules.txt.

 

I have tried the following to access it, but I get a FileNotFountException:

        File file = new File( "./data/rules.txt");

Can you take a screenshot of how your things are laid out?

Or just type the tree structure of your java project's folder.

The "./" specifies the root folder of the class that's being compiled most of the time.

[Claryn]

Can you take a screenshot of how your things are laid out?

Or just type the tree structure of your java project's folder.

The "./" specifies the root folder of the class that's being compiled most of the time.

 

The project is called cah, inside the workspace folder. 

[Nineshadow]

The project is called cah, inside the workspace folder. 

Try

 File file = new File( "../data/rules.txt");

You have two of "." , so you basically look in the root folder(which should be "bin" , or "src") of your root folder.

[Claryn]

Try

 File file = new File( "../data/rules.txt");

You have two of "." , so you basically look in the root folder(which should be "bin" , or "src") of your root folder.

 

This still gives me the same error with the directory I posted.

[Claryn]

This still gives me the same error with the directory I posted.

 

Embarrasing. I have been pasting the data folder into my Eclipse directory, but I am compiling in Netbeans.......... 

I will test with the actual directory now

[dannytech357]

On the same matter:

does anyone know if I can read from a specific line in a .txt file with the Scanner method.

If you create a for loop that counts to the correct line number and write String targetString = Scanner.readLine() every time (or maybe it's readNextLine() idkI haven't used scanners in a while), then when it reaches the end, the value will be the value on that line.