How to create file on linux server using java

Question

Currently I am shifted my server to linux from windows and I am facing some problem in my java webservice. In that I am creating a file in windows D drive. now I want to create that on linux server too. but I dont know how to give path and how to create (since it don't have drives as windows). so need some help for this. I am posting my java code below.

private static void receiveImg(String pic_bitmap) {
    FileOutputStream fos;
    try {

        fos = new FileOutputStream("D:\\AllImages\\ProfilePic\\Test.png");
        byte byteArray[] = Base64.decodeBase64(pic_bitmap);
        fos.write(byteArray);
        fos.close();

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Thanks for any help.

Linux does not use Windows drive letters, where on the Linux system do you want to store your files. I repeat, can't be on "D" drive. — Elliott Frisch, Dec 24 '18 at 11:21
@Elliott Frisch thanks for suggestion. Can you tell how we can use url or path with port number in file path? — minfo, Dec 24 '18 at 12:11
Possible duplicate of [How to read file on Windows and Linux from Java](https://stackoverflow.com/q/25307720/608639), [File path names for Windows and Linux](https://stackoverflow.com/q/20979625/608639), etc. — jww, Dec 25 '18 at 00:12

score 1 · Answer 1 · answered Dec 24 '18 at 11:22

This should work. See below for more considerations

private static void receiveImg(String pic_bitmap) {
    FileOutputStream fos;
    try {

        fos = new FileOutputStream("/tmp/test.png");
        byte byteArray[] = Base64.decodeBase64(pic_bitmap);
        fos.write(byteArray);
        fos.close();

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Note that you need to know the structure of the linux server to save it in a more suited place. If you can ssh onto the server you can run 'ls /' command to see the root folder structure. If you are not deploying the code yourself you may need a DevOps person to help you understand the folder structure on the destination server where you are deploying the code.

thanks for the help. Can we use url or path with port number in file path? — minfo, Dec 24 '18 at 11:52
Not with this code. Note: your code is a bit out of date. https://dzone.com/articles/fileinputstream-fileoutputstream-considered-harmful. Use Files.newOutputStream instead. With regards to a remote server, you'll need something like this: https://stackoverflow.com/questions/40590372/how-to-write-a-string-to-a-file-located-in-remote-server-linux — David, Dec 24 '18 at 12:05

score 0 · Answer 2 · answered Dec 24 '18 at 13:52

this could help you. It does not save an image, but that should not matter.

public void saveImage(String filename) { // filename ( path: linux ): /directory/filename 
    if(filename!=null){
        try {
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(filename));
            oos.writeObject('objectToWrite');
            oos.flush();
            oos.close();
        } catch (FileNotFoundException e) {
            System.out.println(e.getMessage());
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }           
    }else{
        System.out.println("NullPointerException");
    }
}

How to create file on linux server using java

2 Answers2