什么是等效于ImageIO的文件

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

Answer 1

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));

Answer 2

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...);