HTML -> PDF with JRuby and Flying Saucer

pdf_generator.rb

require 'java'
require 'flying_saucer'

java_import org.xhtmlrenderer.pdf.ITextRenderer

class PDFGenerator
  def self.generate(html)
    new(html).generate
  end

  def initialize(html)
    @html         = html
    @renderer     = ITextRenderer.new

    setup_fonts
  end

  def setup_fonts
    fonts_path    = File.expand_path(File.join(File.dirname(__FILE__), '../fonts/*.ttf'))
    font_resolver = @renderer.getFontResolver()

    Dir[fonts_path].each do |file|
      font_resolver.add_font(file, true)
    end
  end

  def generate
    StringIO.new.tap do |io|
      @renderer.set_document_from_string(@html)
      @renderer.layout
      @renderer.create_pdf(io.to_outputstream)
    end
  end
end