如何使用 PDFBox 将标准字体嵌入到生成的 PDF 中 [英] How to embed an standard font into generated PDF with PDFBox

问题描述

我需要使用 Java 的 Apache PDFBox 库向 PDF/A 文件添加一些文本.问题是，因为它需要是一个有效的 PDF/A 文件，所以必须将所有使用的字体嵌入其中.我知道我可以使用 PDFBox 嵌入 TTF 字体，但我想避免必须为应用程序提供字体文件，所以我想知道是否有办法嵌入 PDFBox 中可用的标准字体之一，就好像它一样是外部的.

I need to add some text to PDF/A files using the Apache PDFBox library for Java. The problem is that, because it needs to be a valid PDF/A file, all the used fonts must be embedded in it. I know that I can embed a TTF font using PDFBox, but I'd like to avoid having to provide a font file with the application, so I was wondering if there's a way to embed one of the standard fonts available in PDFBox as if it was external.

例如，当我使用其中一种标准字体编写内容时，PDF 验证器会抱怨:

For example, when I write something using one of the standard fonts, the PDF validator complains about this:

我使用以下代码编写文本:

I've used the following code to write the text:

  PDFont standardFont = PDType1Font.HELVETICA_BOLD;
  
  PDPage pag = new PDPage();
  
  pag.setResources(new PDResources());
  
  PDPageContentStream contentStream = new PDPageContentStream(pdfFile, pag);
  
  //Begin the Content stream 
  contentStream.beginText();       
  
  //Setting the font to the Content stream  
  contentStream.setFont(standardFont, 12);

  //Setting the position for the line 
  contentStream.newLineAtOffset(25, 500);

  //Adding text in the form of string 
  contentStream.showText("JUST A SAMPLE STRING");      

  //Ending the content stream
  contentStream.endText();

  //Closing the content stream
  contentStream.close();
  
  pdfFile.addPage(pag);
  
  pdfFile.save(file);
  
  pdfFile.close();

设置时是否有强制嵌入字体的选项?

Is there any option to force the embed of the font when setting it?

提前致谢，

推荐答案

PDFBox 中只嵌入了一种字体.你可以这样使用它:

There is only one font embedded in PDFBox. You can use it this way:

PDFont font = PDType0Font.load(doc, SomePdfboxClass.class.getResourceAsStream(
                   "/org/apache/pdfbox/resources/ttf/LiberationSans-Regular.ttf"));

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