How to embed font in PDF created from HTML with iText and Flying Saucer?_问答_开发者

How to embed font in PDF created from HTML with iText and Flying Saucer?

开发者 https://www.devze.com 2023-04-07 02:43 出处：网络

I have problem with embedding Polish fonts into PDF converted from HTML. My HTML code have style in body:

I have problem with embedding Polish fonts into PDF converted from HTML.

My HTML code have style in body:

<BODY style="font-family: Tahoma, Arial, sans-serif;font-size : 8pt;">

I tried 2 ways of converting such HTML into PDF:

FOP with htmlcleaner
iText with flying-saucer

For FOP I can add all used fonts into its config file and then created PDF have those fonts embedded (if font is used in HTML). In resulting PDF I have Tahoma font in Identity-H encoding. It looks good -- all Polish letters are displayed as expected.

Then I tried such conversion with iText: seems simplier because I do not need to create transformation for every HTML. Unfortunately I don't know how to embed used fonts into resulting PDF. Most examples I found create PDF from scratch and I don't know how to apply those methods to the Flying Saucer ITextRenderer or other object used in conversion.

My current code tries to add fonts in PDFCreationListener.preOpen() by getting ITextFontResolver and adding font fs.addFont(path, true);. But all .pdf I create do not have fonts I want.

The second problem is that result PDF do not have Polish letters. Is it probl开发者_StackOverflowem in Flying Saucer or in iText? Acrobat shows that created PDF document uses Helvetica with Ansi encoding and ArialMT as font. I think this Ansi encoding is not good. How can I set Polish encoding (Identity-H)?

You may try the -fs-pdf-font-embed, and -fs-pdf-font-encoding css rules.

From the User's Guide:

-fs-pdf-font-embed: use with the value embed inside a font-face rule to have Flying Saucer embed a font file within a PDF document, avoiding the need to call the addFont() method of the FontResolver class

-fs-pdf-font-encoding: use inside a font-face rule to specify the enconding for a custom font you are embedding inside a PDF; takes the name of the encoding as value.

For example in your print css:

@font-face {
    font-family: DejaVu Serif;
    src: url(fonts/DejaVuSerif.ttf);
    -fs-pdf-font-embed: embed;
    -fs-pdf-font-encoding: Identity-H;
}

Working example:

Files in the root project directory:

Calibri.ttf
input.html

Code:

File inputFile = new File("input.html");
File outputFile = new File("example.pdf");

ITextRenderer renderer = new ITextRenderer();

String url = inputFile.toURI().toURL().toString();
FileOutputStream fileOutputStream = new FileOutputStream(outputFile);

renderer.setDocument(url);
renderer.getFontResolver().addFont("Calibri.ttf", BaseFont.IDENTITY_H, true);
renderer.layout();
renderer.createPDF(fileOutputStream);

fileOutputStream.close();

HTML:

<style type="text/css">
    body {
        font-family: Calibri, sans-serif;
    }
</style>

Surprisingly @font-face css is not needed

My mistake was to use FontResolver.addFont() in PDFCreationListener.preOpen(). I moved it just before renderer.layout(); and it works now!

If you've tried all the options and it still doesn't work, it's most likely a problem with with a font-family value that doesn't match the file name

You can find out the correct value using FontForge. Open font file in this program, then select the menu item Element -> Font Info. The correct value will be in the Family Name field

Minimum required html code:

<html>
<head>
    <style>
        body {
            font-family: 'Calibri 123', sans-serif;
        }
    </style>
</head>
<body>
<p>
    Hello, Calibri 123
</p>
</body>
</html>

Minimum required java code:

ITextRenderer renderer = new ITextRenderer();
renderer.getFontResolver().addFont("/path/to/font/Calibri.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
renderer.setDocumentFromString(/*read html from file*/);
renderer.layout();
renderer.createPDF(/*stream here*/);