Converting an image to byte[] by using PDFBox

Question

I am using PDFBox 2.0. While parsing a PDF document, I also want to get first page as image and store it to hbase for using it in search results(I am going to create a search list page like search page of amazon.com).

HBase accepts byte[] variable to store(index) a value. I need to convert the image as byte[], then store it to HBase. I have implemented image render, but how can I convert it to byte[]?

        PDDocument document = PDDocument.load(file, "");
        BufferedImage image = null;
        try {
            PDFRenderer pdfRenderer = new PDFRenderer(document);
            if (document.isEncrypted()) {
                try {
                    System.out.println("Trying to decrypt...);
                    document.setAllSecurityToBeRemoved(true);
                    System.out.println("The file has been decrypted in .");
                }
                catch (Exception e) {
                    throw new Exception("cannot be decrypted. ", e);
                }
            }
            PDPage firstPage = (PDPage) document.getDocumentCatalog().getPages().get(0);
            pdfRenderer.renderImageWithDPI(0, 300, ImageType.RGB);
               // 0 means first page.

            image = pdfRenderer.renderImageWithDPI(0, 300, ImageType.RGB);                  
            document.close();

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

If I write ImageIOUtil.writeImage(image , fileName+".jpg" ,300); above right above document.close();, program creates a jpg file in project path. I need to put it in a byte[] array instead of creating a file. Is it possible?

Adam · Accepted Answer · 2016-04-19 20:38:22Z

4

This can be done with ImageIO.write(Image, String, OutputStream) which can write to an arbitrary OutputStream rather than disk. ByteArrayOutputStream can store the output bytes into an array in memory.

import java.io.ByteArrayOutputStream;
...
// example image
BufferedImage image = new BufferedImage(4, 3, BufferedImage.TYPE_INT_ARGB);

// to array
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ImageIO.write(image, "jpg", bos);
byte [] output = bos.toByteArray();
System.out.println(Arrays.toString(output));

edited Apr 19, 2016 at 20:38

answered Apr 19, 2016 at 20:33

Adam

36.9k9 gold badges104 silver badges145 bronze badges

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

3 Comments

Munchmallow Over a year ago

What library is ByteOutputStream using? is it com.sun.xml.internal.messaging.saaj.util.ByteOutputStream;?

Adam Over a year ago

My bad, should have been java.io.ByteArrayOutputStream which is core Java class, updated answer...

Munchmallow Over a year ago

Thank you so much. Now I have to think about how I can get it from hbase and show it as an image on search list.

Collectives™ on Stack Overflow

Converting an image to byte[] by using PDFBox

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related