java 使用 PDFBox 将 UTF-8 编码的字符串写入 PDF
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Using PDFBox to write UTF-8 encoded strings to a PDF
提问by Lucas Moellers
I am having trouble writing unicode characters out to a PDF using PDFBox. Here is some sample code that generates garbage characters instead of outputting "?". What can I add to get support for UTF-8 strings?
我在使用 PDFBox 将 unicode 字符写入 PDF 时遇到问题。这是一些生成垃圾字符而不是输出“？”的示例代码。我可以添加什么来获得对 UTF-8 字符串的支持？
PDDocument document = new PDDocument();
PDPage page = new PDPage();
document.addPage(page);
PDPageContentStream contentStream = new PDPageContentStream(document, page);
PDType1Font font = PDType1Font.HELVETICA;
contentStream.setFont(font, 12);
contentStream.beginText();
contentStream.moveTextPositionByAmount(100, 400);
contentStream.drawString("?");
contentStream.endText();
contentStream.close();
document.save("test.pdf");
document.close();
回答by gutch
You are using one of the inbuilt 'Base 14' fonts that are supplied with Adobe Reader. These fonts are not Unicode; they are effectively a standard Latin alphabet, though with a couple of extra characters. It looks like the character you mention, a lowercase s with a caron (?), is not available in PDF Latin text... though an uppercase ? isavailable but curiously on Windows only. See Appendix D of the PDF specification at http://www.adobe.com/devnet/pdf/pdf_reference.htmlfor details.
您正在使用 Adobe Reader 提供的内置“Base 14”字体之一。这些字体不是 Unicode；它们实际上是一个标准的拉丁字母表，尽管有几个额外的字符。看起来您提到的字符，带有 Caron (?) 的小写 s，在 PDF 拉丁文本中不可用...虽然大写 ? 是可用的，但奇怪的只能在Windows上。有关详细信息，请参阅http://www.adobe.com/devnet/pdf/pdf_reference.html 上PDF 规范的附录 D。
Anyway, getting to the point... you need to embed a Unicode font if you want to use Unicode characters. Make sure you are licensed to embed whatever font you decide on... I can recommend the open-source Gentiumor Doulosfonts because they're free, high quality and have comprehensive Unicode support.
无论如何，切入正题……如果您想使用 Unicode 字符，则需要嵌入 Unicode 字体。确保您获得了嵌入您决定的任何字体的许可...我可以推荐开源的Gentium或Doulos字体，因为它们是免费的、高质量的并且具有全面的 Unicode 支持。
