Arabic problems with converting html to PDF using ITextRenderer

问题

When I use ITextRenderer converting html to PDF.this is my code

ByteArrayOutputStream out = new ByteArrayOutputStream();

ITextRenderer renderer = new ITextRenderer();
String inputFile = "C://Users//Administrator//Desktop//aaa2.html";
String url = new File(inputFile).toURI().toURL().toString();
renderer.setDocument(url);
renderer.getSharedContext().setReplacedElementFactory(
        new B64ImgReplacedElementFactory());
    // 解决阿拉伯语问题
ITextFontResolver fontResolver = renderer.getFontResolver();
try {
    fontResolver.addFont("C://Users//Administrator//Desktop//arialuni.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
} catch (DocumentException e) {
    e.printStackTrace();
}

renderer.layout();
OutputStream outputStream = new FileOutputStream("C://Users//Administrator//Desktop//HTMLasPDF.pdf");
renderer.createPDF(outputStream, true);
/*PdfWriter writer = renderer.getWriter();

writer.open();
writer.setRunDirection(PdfWriter.RUN_DIRECTION_RTL);
OutputStream outputStream2 = new FileOutputStream(  "C://Users//Administrator//Desktop//HTMLasPDFcopy.txt");
renderer.createPDF(outputStream2);*/
renderer.finishPDF();
out.flush();
out.close();

Actual PDF Result:

Expected PDF Result:

How to make arabic ligature?

回答1:

If you want to do this properly (I assume using iText, since your post is tagged as such), you should use

iText7
pdfHTML (to convert HTML to PDF)
pdfCalligraph (to handle Arabic ligatures properly)
a font that supports these features (as indicated by another answer)

For an example, please consult the HTML to PDF tutorial, more specifically the following FAQ item: How to convert HTML containing Arabic/Hebrew characters to PDF?

You need fonts that contain the glyphs you need, e.g.:

public static final String[] FONTS = {
    "src/main/resources/fonts/noto/NotoSans-Regular.ttf",
    "src/main/resources/fonts/noto/NotoNaskhArabic-Regular.ttf",
    "src/main/resources/fonts/noto/NotoSansHebrew-Regular.ttf"
};

And you need a FontProvider that knows how to find these fonts in the ConverterProperties:

public void createPdf(String src, String[] fonts, String dest) throws IOException {
    ConverterProperties properties = new ConverterProperties();
    FontProvider fontProvider = new DefaultFontProvider(false, false, false);
    for (String font : fonts) {
        FontProgram fontProgram = FontProgramFactory.createFont(font);
        fontProvider.addFont(fontProgram);
    }
    properties.setFontProvider(fontProvider);
    HtmlConverter.convertToPdf(new File(src), new File(dest), properties);
}

Note that the text will come out all wrong if you don't have the pdfCalligraph add-on. That add-on didn't exist at the time Flying Saucer was created, hence you can't use Flying Saucer for converting documents with text in Arabic, Hindi, Telugu,... Read the pdFCalligraph white paper if you want to know more about ligatures.

回答2:

Greek characters seemed to be omitted; they didn’t show up in the document.

In flying saucer the generated PDF uses some kind of default (probably Helvetica) font, that contains a very limited character set, that obviously does not contain the Greek code page. link

回答3:

I change the way to convert pdf by using wkhtmltopdf.

来源：https://stackoverflow.com/questions/43060200/arabic-problems-with-converting-html-to-pdf-using-itextrenderer

标签

itext

flying-saucer