what is the file equivalent to ImageIO

Question

Hi to you all java experts.

I have this piece of code I could finally put together that works: (it's mostly java with a little ADF code)

public String upload(){
    UploadedFile myfile = this.getFile();

    FacesContext fctx = FacesContext.getCurrentInstance();
    ServletContext servletCtx =
        (ServletContext)fctx.getExternalContext().getContext();
    String imageDirPath = servletCtx.getRealPath("/");
    String nomdefichier = myfile.getFilename();
    String mimetype = nomdefichier.substring(nomdefichier.length() - 3);
    try {
        InputStream inputStream = myfile.getInputStream();
        BufferedImage input = ImageIO.read(inputStream);

        File outputFile =
            new File( System.getProperty("user.home") + File.separator + this.path + File.separator + nomdefichier);         
        ImageIO.write(input, mimetype, outputFile);

    } catch (Exception ex) {
        // handle exception
    }
    FacesMessage message =
        new FacesMessage(mimetype + "Successfully uploaded file " + nomdefichier +
                         " (" + myfile.getLength() + " bytes)" + mimetype);
    fctx.addMessage(null, message);

    return null;

}

This codes uploads a picture just fine. I would really like to know if there is a file equivalent to ImageIO.write so that I could upload PDF, DOCX and such.

Thanks in advance for any response.

Best regards.

Marc Arbour

Files are just bytes. You can upload any kind of file with just regular streams. Your example code is unnecessarily creating a `BufferedImage`, when you could just write the bytes you're getting from the inputstream directly to disk. — Kayaman, Jul 30 '14 at 15:18
Would you be kind enough to detail a little or to point me towards a tutorial so that I could learn not to use a bufferedimage but rather bytes. Thanks — Marc Arbour, Jul 30 '14 at 15:21
An illustration of what @Kayaman is referring to can be found [here](http://stackoverflow.com/q/43157/1076463) — Robin, Jul 30 '14 at 15:23

score 2 · Accepted Answer · answered Jul 30 '14 at 15:24

2

A simplified version of your code could be written as follows (omitting some of the JSF related stuff).

InputStream in = myFile.getInputStream();
Files.copy(in, Paths.get(yourPath));

answered Jul 30 '14 at 15:24

Kayaman

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Hi again Kayaman, your code works but it seems to remove a couple of bytes to each file uploaded making my PDF corrupted, Is there something I am missing? – Marc Arbour Jul 30 '14 at 15:45
There's not much that could be missing. `Files.copy()` handles things rather automatically. How many bytes are missing? – Kayaman Jul 30 '14 at 15:48
8 to be precise, it's the same with a word document... 8 bytes missing... here is my code `Files.copy(inputStream, Paths.get(System.getProperty("user.home") + File.separator + this.path + File.separator + nomdefichier), REPLACE_EXISTING COPY_ATTRIBUTES)` – Marc Arbour Jul 30 '14 at 15:56
I guess I should post this into another question since I marked this one as resolved. Thanks guys. – Marc Arbour Jul 30 '14 at 17:13

score 0 · Answer 2 · answered Jul 30 '14 at 15:24

You can write a byte array or an InputStream to a file with the java.nio.file.Files class (since Java 1.7).

// Saving data from an inputstream to a file:
Files.copy(inputStream, targetPath, copyOptions...);

// Saving a byte array to a file:
Files.write(path, byteArray, openOptions...);

what is the file equivalent to ImageIO

2 Answers2