Develop Reference

Vaadin Convert and display image as PDF

Does anyone know how image file can be easily converted into PDF format. What I need is to get the image from database and display it on the screen as PDF. What am I doing wrong? I tried to use iText but with no results.
My code:
StreamResource resource = file.downloadFromDatabase();//get file from db
Document converToPdf=new Document();//Create Document Object
PdfWriter.getInstance(convertToPdf, new FileOutputStream(""));//Create PdfWriter for Document to hold physical file
convertToPdf.open();
Image convertJpg=Image.getInstance(resource); //Get the input image to Convert to PDF
convertToPdf.add(convertJpg);//Add image to Document
Embedded pdf = new Embedded("", convertToPdf);//display document
pdf.setMimeType("application/pdf");
pdf.setType(Embedded.TYPE_BROWSER);
pdf.setSizeFull();
Thanks.

You're not using iText correctly:
You never close your writer, so the addition of the image never gets written to the outputstream.
You pass an empty string to your FileOutputStream. If you want to keep the pdf in memory, use a ByteArrayOutputStream. If not, define a temporary name instead.
You pass your Document object, which is a iText-specific object to your Embedded object and treat it like a file. It is not a pdf-file or byte[]. You'll probably want to pass either your ByteArrayOutputStream or read the temp file as a ByteArrayOutputStream into memory and pass that to Embedded.

Maybe someone will use (Vaadin + iText)
Button but = new Button("FV");
StreamResource myResource = getPDFStream();
FileDownloader fileDownloader = new FileDownloader(myResource);
fileDownloader.extend(but);
hboxBottom.addComponent( but );
private StreamResource getPDFStream() {
StreamResource.StreamSource source = new StreamResource.StreamSource() {
public InputStream getStream() {
// step 1
com.itextpdf.text.Document document = new com.itextpdf.text.Document();
// step 2
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
com.itextpdf.text.pdf.PdfWriter.getInstance(document, baos);
// step 3
document.open();
document.add(Chunk.NEWLINE); //Something like in HTML :-)
document.add(new Paragraph("TEST" ));
document.add(Chunk.NEWLINE); //Something like in HTML :-)
document.newPage(); //Opened new page
//document.add(list); //In the new page we are going to add list
document.close();
//file.close();
System.out.println("Pdf created successfully..");
} catch (DocumentException ex) {
Logger.getLogger(WndOrderZwd.class.getName()).log(Level.SEVERE, null, ex);
}
ByteArrayOutputStream stream = baos;
InputStream input = new ByteArrayInputStream(stream.toByteArray());
return input;
}
};
StreamResource resource = new StreamResource ( source, "test.pdf" );
return resource;
}

Finding trouble to change installed font using iText library

So I was trying to use this font I installed called "Tengwar Quenya-1 Regular" and it didn't work, it keep writing de PDF document with the default font. So I tried to use the downloaded file, by using EMBED method, and it is still printing the default font, I wondering if anyone had tried this before, and could tell me what I am doing wrong. Check the code:
public void testePdf(){
Document document = new Document();
String filename = "C:\\Users\\Marcelo\\Downloads\\tengwar_quenya\\QUENCAP1.TFF";
FontFactory.register(filename);
Font fonte = FontFactory.getFont(filename, BaseFont.CP1252, BaseFont.EMBEDDED);
try {
PdfWriter.getInstance(document,
new FileOutputStream(filename+ "HelloWorld.pdf"));
document.open();
document.add(new Paragraph("A Hello World PDF document.", fonte));
document.close(); // no need to close PDFwriter?
} catch (DocumentException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
It compiles fine, just not with the font I selected. If it is a glyph instead of a caracter, will it be a problem?

I have Googled for the font you mention. I have downloaded it and I have made a small SSCCE that you can download here: TengwarQuenya1
This is the code:
public static final String FONT = "resources/fonts/QUENCAP1.TTF";
public void createPdf(String dest) throws IOException, DocumentException {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(DEST));
document.open();
Font f1 = FontFactory.getFont(FONT, BaseFont.WINANSI, BaseFont.EMBEDDED, 12);
document.add(new Paragraph("A Hello World PDF document.", f1));
document.close();
}
This is the result: tengwarquenya1.pdf
I'm not sure what the resulting text means, but it doesn't look like the default font to me.
In other words: I can't reproduce the problem. Note that you don't need to register a font if you pass its file path to the FontFactory. Obviously, my font path is different from yours. I think that yours is wrong. Try putting the ".TTF" file in another location.

pdfwriter doesn't translate special characters

I have HTML file with an external CSS. I want to create PDF from the HTML file, but the endcoing doesn't work. HTML file works fine, but after transfering to PDF, some characters in PDF are missing. (čřě...) It happens even if I set the Charset in PDFWriter constructor.
How do I solve this, please?
public void createPDF() {
try {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(username + ID + ".pdf"));
document.open();
String hovinko = username + ID + ".html";
XMLWorkerHelper.getInstance().parseXHtml(writer, document, new FileInputStream(hovinko), Charset.forName("UTF-8"));
document.close();
System.out.println("PDF Created!");
} catch (Exception ex) {
ex.printStackTrace();
}
}

Did you try to convert your special characters before writing them to your PDF?
yourHTMLString.replaceAll(oldChar, newChar);
ć = ć
ř = ř
ě = ě
If you need more special characters, visit this link.
EDIT: Then try this out, it worked for me:
BaseFont basefont = BaseFont.createFont("C:/Windows/Fonts/ARIAL.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
Font font = new Font(basefont, 12);
document.add(new Paragraph("čřě", font));

Try it with below logic. It worked for me:
InputStream is = new ByteArrayInputStream(hovinko.getBytes(Charset.forName("UTF-8")));
XMLWorkerHelper.getInstance().parseXHtml(writer, document, is, Charset.forName("UTF-8"));
I used xmlworker version 5.5.12 and itextpdf version 5.5.12.

I was strugling with sam problem (Polish special signs).
For me solution was to write a good font-family in html code.

Get empty image when transcoding SVG to PNG

I'm trying to generate an SVG image and then transcode it to PNG using Apache Batik. However, I end up with an empty image and I can't see why.
I use the Document from SVGDomImplementation as the base for my transcoding (to avoid writing the SVG to disk and loading it again). Here's an example:
DOMImplementation domImpl = SVGDOMImplementation.getDOMImplementation();
String namespace = SVGDOMImplementation.SVG_NAMESPACE_URI;
Document document = domImpl.createDocument(namespace, "svg", null);
//stuff that builds SVG (and works)
TranscoderInput transcoderInput = new TranscoderInput(svgGenerator.getDOMFactory());
PNGTranscoder transcoder = new PNGTranscoder();
transcoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, new Float(svgWidth));
transcoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, new Float(svgHeight));
try {
File temp = File.createTempFile(key, ".png");
FileOutputStream outputstream = new FileOutputStream(temp);
TranscoderOutput output = new TranscoderOutput(outputstream);
transcoder.transcode(transcoderInput, output);
outputstream.flush();
outputstream.close();
name = temp.getName();
} catch (IOException ioex) {
ioex.printStackTrace();
} catch (TranscoderException trex) {
trex.printStackTrace();
}
My problem is that the resulting image is empty and I can't see why. Any hints?

I think it depends on how you're creating the SVG document. What are you using svgGenerator for (which I assume is an SVGGraphics2D)?
TranscoderInput transcoderInput = new TranscoderInput(svgGenerator.getDOMFactory());
If you've built up the SVG document in document, then you should pass it to the TranscoderInput constructor.
This page has an example of rasterizing an SVG DOM to a JPEG.

How can I save a PNG with a tEXt or iTXt chunk from Java?

I am currently using javax.imageio.ImageIO to write a PNG file. I would like to include a tEXt chunk (and indeed any of the chunks listed here), but can see no means of doing so.
By the looks of com.sun.imageio.plugins.png.PNGMetadata it should be possible.
I should be most grateful for any clues or answers.
M.

The solution I struck upon after some decompilation, goes as follows ...
RenderedImage image = getMyImage();
Iterator<ImageWriter> iterator = ImageIO.getImageWritersBySuffix( "png" );
if(!iterator.hasNext()) throw new Error( "No image writer for PNG" );
ImageWriter imagewriter = iterator.next();
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
imagewriter.setOutput( ImageIO.createImageOutputStream( bytes ) );
// Create & populate metadata
PNGMetadata metadata = new PNGMetadata();
// see http://www.w3.org/TR/PNG-Chunks.html#C.tEXt for standardized keywords
metadata.tEXt_keyword.add( "Title" );
metadata.tEXt_text.add( "Mandelbrot" );
metadata.tEXt_keyword.add( "Comment" );
metadata.tEXt_text.add( "..." );
metadata.tEXt_keyword.add( "MandelbrotCoords" ); // custom keyword
metadata.tEXt_text.add( fractal.getCoords().toString() );
// Render the PNG to memory
IIOImage iioImage = new IIOImage( image, null, null );
iioImage.setMetadata( metadata ); // Attach the metadata
imagewriter.write( null, iioImage, null );

I realise this question is long since answered, but if you want to do it without dipping into the "com.sun" hierarchy, here's an quick and very ugly example as I couldn't find this documented anywhere else.
BufferedImage img = new BufferedImage(300, 300, BufferedImage.TYPE_INT_ARGB);
// Create a DOM Document describing the metadata;
// I've gone the quick and dirty route. The description for PNG is at
// [http://download.oracle.com/javase/1.4.2/docs/api/javax/imageio/metadata/doc-files/png_metadata.html][1]
Calendar c = Calendar.getInstance();
String xml = "<?xml version='1.0'?><javax_imageio_png_1.0><tIME year='"+c.get(c.YEAR)+"' month='"+(c.get(c.MONTH)+1)+"' day='"+c.get(c.DAY_OF_MONTH)+"' hour='"+c.get(c.HOUR_OF_DAY)+"' minute='"+c.get(c.MINUTE)+"' second='"+c.get(c.SECOND)+"'/><pHYs pixelsPerUnitXAxis='"+11811+"' pixelsPerUnitYAxis='"+11811+"' unitSpecifier='meter'/></javax_imageio_png_1.0>";
DOMResult domresult = new DOMResult();
TransformerFactory.newInstance().newTransformer().transform(new StreamSource(new StringReader(xml)), domresult);
Document document = dom.getResult();
// Apply the metadata to the image
ImageWriter writer = (ImageWriter)ImageIO.getImageWritersBySuffix("png").next();
IIOMetadata meta = writer.getDefaultImageMetadata(new ImageTypeSpecifier(img), null);
meta.setFromTree(meta.getMetadataFormatNames()[0], document.getFirstChild());
FileOutputStream out = new FileOutputStream("out.png");
writer.setOutput(ImageIO.createImageOutputStream(out));
writer.write(new IIOImage(img, null, meta));
out.close();

Using Java 1.6, I edited Mike's code to
Node document = domresult.getNode();
instead of his line
Document document = dom.getResult();
Moreover, I'd suggest to add a line
writer.dispose()
after the job has been done, so that any resources held by the writer are released.

We do this in the JGraphX project. Download the source code and have a look in the com.mxgraph.util.png package, there you'll find three classes for encoding that we copied from the Apache Batik sources. An example of usage is in com.mxgraph.examples.swing.editor.EditorActions in the saveXmlPng method. Slightly edited the code looks like:
mxPngEncodeParam param = mxPngEncodeParam
.getDefaultEncodeParam(image);
param.setCompressedText(new String[] { "mxGraphModel", xml });
// Saves as a PNG file
FileOutputStream outputStream = new FileOutputStream(new File(
filename));
try
{
mxPngImageEncoder encoder = new mxPngImageEncoder(outputStream,
param);
if (image != null)
{
encoder.encode(image);
}
}
finally
{
outputStream.close();
}
Where image is the BufferedImage that will form the .PNG and xml is the string we wish to place in the iTxt section. "mxGraphModel" is the key for that xml string (the section comprises some number of key/value pairs), obviously you replace that with your key.
Also under com.mxgraph.util.png we've written a really simple class that extracts the iTxt without processing the whole image. You could apply the same idea for the tEXt chunk using mxPngEncodeParam.setText instead of setCompressedText(), but the compressed text section does allow for considerable larger text sections.

Try the Sixlegs Java PNG library (http://sixlegs.com/software/png/).
It claims to have support for all chunk types and does private chunk handling.

Old question, but... PNGJ gives full control for reading and writing PNG chunks