How to add external CSS while generating PDF?

I would like to add a CSS file while generating PDF.

Currently i am using following code to generate PDF in a JSP file:

response.setContentType("application/force-download");
response.setHeader("Content-Disposition", "attachment;filename=reports.pdf");
Document document = new Document();
document.setPageSize(PageSize.A1);
PdfWriter writer = null;
writer = PdfWriter.getInstance(document, response.getOutputStream());
document.open();
ByteArrayInputStream bis
    = new ByteArrayInputStream(htmlSource.toString().getBytes());
XMLWorkerHelper.getInstance().parseXHtml(writer, document, bis);
document.close();

With this code, I'm able to generate PDF, but I would like to add a CSS file while generating PDF.

Posted on StackOverflow on Jul 16, 2014 by Yella Goud

Please take a look at the ParseHtmlTable1 example. In this example, we have HTML stored in a StringBuilder object and some CSS stored in a String. In my example, I convert the sb object and the CSS object to an InputStream. If you have files with the HTML and the CSS, you could easily use a FileInputStream.

Once you have an InputStream for the HTML and the CSS, you can use this code:

// CSS
CSSResolver cssResolver = new StyleAttrCSSResolver();
CssFile cssFile = XMLWorkerHelper.getCSS(new ByteArrayInputStream(CSS.getBytes()));
cssResolver.addCss(cssFile);
// HTML
HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
// Pipelines
PdfWriterPipeline pdf = new PdfWriterPipeline(document, writer);
HtmlPipeline html = new HtmlPipeline(htmlContext, pdf);
CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);
// XML Worker
XMLWorker worker = new XMLWorker(css, true);
XMLParser p = new XMLParser(worker);
p.parse(new ByteArrayInputStream(sb.toString().getBytes()));

Or, if you don't like all that code:

ByteArrayInputStream bis =
    new ByteArrayInputStream(htmlSource.toString().getBytes());
ByteArrayInputStream cis =
    new ByteArrayInputStream(cssSource.toString().getBytes());
XMLWorkerHelper.getInstance().parseXHtml(writer, document, bis, cis);