直接将java.awt.Image添加到itext

Question

I was wondering if you could add a java.awt.Image to itext directly; all the responses to this question I've seen so far suggest to write the image to disk

   ImageIO.write(img, "png", "output.png);

Then fetch it using the com.itextpdf.text.Image method Image.getInstance()

   Image iTextImage = Image.getInstance("output.png");

This solution works but is not quite elegant. Is there any way to do this better?

Answer 1

If you look at the iText API documentation for the Image class , then you will see that there are many other ways than a filename to use an image:

• static Image getInstance(byte[] imgb)
• static Image getInstance(byte[] imgb, boolean recoverFromImageError) gets an instance of an Image
• static Image getInstance(Image image) gets an instance of an Image
• static Image getInstance(Image image, Color color) Gets an instance of an Image from a java.awt.Image .
• static Image getInstance(Image image, Color color, boolean forceBW) Gets an instance of an Image from a java.awt.Image .
• static Image getInstance(int width, int height, boolean reverseBits, int typeCCITT, int parameters, byte[] data) Creates an Image with CCITT G3 or G4 compression.
• static Image getInstance(int width, int height, boolean reverseBits, int typeCCITT, int parameters, byte[] data, int[] transparency) Creates an Image with CCITT G3 or G4 compression.
• static Image getInstance(int width, int height, byte[] data, byte[] globals) Creates a JBIG2 Image .
• static Image getInstance(int width, int height, int components, int bpc, byte[] data) Gets an instance of an Image in raw mode.
• static Image getInstance(int width, int height, int components, int bpc, byte[] data, int[] transparency) Gets an instance of an Image in raw mode.
• static Image getInstance(PdfContentByte cb, Image awtImage, float quality) Gets an instance of a Image from a java.awt.Image .
• static Image getInstance(PdfTemplate template) gets an instance of an Image
• static Image getInstance(PdfWriter writer, Image awtImage, float quality) Gets an instance of a Image from a java.awt.Image .
• static Image getInstance(PRIndirectReference ref) Reuses an existing image.
• static Image getInstance(String filename) Gets an instance of an Image
• static Image getInstance(String filename, boolean recoverFromImageError)
• static Image getInstance(URL url)
• static Image getInstance(URL url, boolean recoverFromImageError) Gets an instance of an Image .

You can find an example on how to use a java.awt.Image on the official web site. See the ImageTypes example:

// Adding a java.awt.Image
java.awt.Image awtImage =
    Toolkit.getDefaultToolkit().createImage(RESOURCE);
img = com.itextpdf.text.Image.getInstance(awtImage, null);
document.add(new Paragraph(
    String.format("%s is an image of type %s",
    "java.awt.Image", img.getClass().getName())));
document.add(img);