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PDF Renderer Converter
flexmark-java PDF Renderer extension
The flexmark-pdf-converter module renders HTML to PDF using
Open HTML To PDF so the full conversion requires
rendering Markdown to HTML then passing it to the PDF converter extension.
Sample application is provided PdfConverter.java.
Bundled fonts in the OpenHtmlToPDF library support only basic latin unicode characters. To render other character sets additional fonts must be included in the HTML being converted.
A solution to the font problem is to define an embedded TrueType font in the style or stylesheet
and set the body tag to use this font. OpenHtmlToPDF will use the characters from the font
which has them defined.
For example including Noto Serif/Sans/Mono fonts and adding
noto-serif, noto-sans and noto-mono families to CSS to allow PDF to use these for
rendering text.
However, the PDF converter requires TrueType fonts and Noto CJK fonts are OpenFonts which
cannot be used. The solution is to download a TrueType Unicode font that supports CJK character
set and add it to the custom rendering profile to be used for PDF.
For my test I used arialuni.ttf from https://www.wfonts.com/font/arial-unicode-ms
If the installation directory for the fonts is /usr/local/fonts/ then the following in the
stylesheet or the page <head> <style>...</style> </head> should be added:
ℹ️ Don't forget to change the path to your OS and installation directory. On
windows the path should start with file:/X:/... where X:/... is the drive letter followed by
the full installation path.
@font-face {
font-family: 'noto-cjk';
src: url('file:///usr/local/fonts/arialuni.ttf');
font-weight: normal;
font-style: normal;
}
@font-face {
font-family: 'noto-serif';
src: url('file:///usr/local/fonts/NotoSerif-Regular.ttf');
font-weight: normal;
font-style: normal;
}
@font-face {
font-family: 'noto-serif';
src: url('file:///usr/local/fonts/NotoSerif-Bold.ttf');
font-weight: bold;
font-style: normal;
}
@font-face {
font-family: 'noto-serif';
src: url('file:///usr/local/fonts/NotoSerif-BoldItalic.ttf');
font-weight: bold;
font-style: italic;
}
@font-face {
font-family: 'noto-serif';
src: url('file:///usr/local/fonts/NotoSerif-Italic.ttf');
font-weight: normal;
font-style: italic;
}
@font-face {
font-family: 'noto-sans';
src: url('file:///usr/local/fonts/NotoSans-Regular.ttf');
font-weight: normal;
font-style: normal;
}
@font-face {
font-family: 'noto-sans';
src: url('file:///usr/local/fonts/NotoSans-Bold.ttf');
font-weight: bold;
font-style: normal;
}
@font-face {
font-family: 'noto-sans';
src: url('file:///usr/local/fonts/NotoSans-BoldItalic.ttf');
font-weight: bold;
font-style: italic;
}
@font-face {
font-family: 'noto-sans';
src: url('file:///usr/local/fonts/NotoSans-Italic.ttf');
font-weight: normal;
font-style: italic;
}
@font-face {
font-family: 'noto-mono';
src: url('file:///usr/local/fonts/NotoMono-Regular.ttf');
font-weight: normal;
font-style: normal;
}
body {
font-family: 'noto-sans', 'noto-cjk', sans-serif;
overflow: hidden;
word-wrap: break-word;
font-size: 14px;
}
var,
code,
kbd,
pre {
font: 0.9em 'noto-mono', Consolas, "Liberation Mono", Menlo, Courier, monospace;
}Use class PdfConverterExtension from artifact flexmark-pdf-converter.
The following options are available:
Defined in PdfConverterExtension class:
| Static Field | Default Value | Description |
|---|---|---|
| DEFAULT_TEXT_DIRECTION | (PdfRendererBuilder.TextDirection) null |
default text direction for document |
| PROTECTION_POLICY | (ProtectionPolicy) null |
document protection policy PDF Box Documentation, Related OpenHtmlToPdf |
| DEFAULT_CSS | default embedded CSS for improved TOC generation | default.css |
ℹ️ Default CSS is only added if
PdfConverterExtension.exportToPdf(OutputStream, String, String, DataHolder) is used to provide
options. For all other calls you need to embed the default css into your HTML string before
exporting to PDF. You can use PdfConverterExtension.embedCss(String html, String css) for this
purpose and get the contents of the default css using
PdfConverterExtension.DEFAULT_CSS.getFrom(null)
ℹ️ If you are using the TocExtension, you will need to set TocExtension.LIST_CLASS to
PdfConverterExtension.DEFAULT_TOC_LIST_CLASS