FileOutputStream outputStream=null; try{ outputStream=new FileOutputStream(saveFilePath); PdfWriter writer = new PdfWriter(saveFilePath); PdfDocument pdfDoc = new PdfDocument(writer); pdfDoc.setDefaultPageSize(PageSize.A4); ConverterProperties converterProperties = new ConverterProperties(); FontProvider provider = new FontProvider(); provider.addFont("D:/home/file/static/fonts/SourceHanSansSC-Regular.otf"); provider.addStandardPdfFonts(); byte[] fontBytes = Files.readAllBytes(Paths.get("D:/home/file/static/fonts/SourceHanSansSC-Regular.otf")); PdfFont pdfFont = PdfFontFactory.createFont(fontBytes, PdfEncodings.IDENTITY_H, false); pdfDoc.addFont(pdfFont); converterProperties.setFontProvider(provider); converterProperties.setCharset("UTF-8"); pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, new PDFBuilder(pdfFont,title,pdfTime,footLabel)); Document doc = HtmlConverter.convertToDocument(htmlData, pdfDoc, converterProperties); doc.close(); writer.close(); outputStream.close(); }catch(Exception ex){ throw new PDFException("PDF export to File fail",ex); }finally{ IOUtils.closeQuietly(outputStream); } 字体文件是思源黑体，生成pdf时，html有em标签的斜体样式，但是生成的pdf中文斜体样式没有了，怎么改

首先，要在`FontProvider`中添加思源黑体的斜体字体。在思源黑体字体文件所在的文件夹中，有一个名为SourceHanSansSC-Bold.otf的文件，它是思源黑体的粗体字体。我们可以在`FontProvider`中添加这个粗体字体，然后通过设置CSS样式的方式来实现斜体。

以下是修改后的代码示例：

FileOutputStream outputStream=null;
try{
    outputStream=new FileOutputStream(saveFilePath);
    PdfWriter writer = new PdfWriter(saveFilePath);
    PdfDocument pdfDoc = new PdfDocument(writer);
    pdfDoc.setDefaultPageSize(PageSize.A4);

    ConverterProperties converterProperties = new ConverterProperties();
    FontProvider provider = new FontProvider();
    provider.addFont("D:/home/file/static/fonts/SourceHanSansSC-Regular.otf");//添加思源黑体常规字体
    provider.addFont("D:/home/file/static/fonts/SourceHanSansSC-Bold.otf");//添加思源黑体粗体字体
    provider.addStandardPdfFonts();

    byte[] fontBytes = Files.readAllBytes(Paths.get("D:/home/file/static/fonts/SourceHanSansSC-Regular.otf"));
    PdfFont pdfFont = PdfFontFactory.createFont(fontBytes, PdfEncodings.IDENTITY_H, false);
    pdfDoc.addFont(pdfFont);

    converterProperties.setFontProvider(provider);
    converterProperties.setCharset("UTF-8");

    pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, new PDFBuilder(pdfFont,title,pdfTime,footLabel));

    //设置CSS样式，实现中文斜体
    ConverterProperties cssProperties = new ConverterProperties();
    CssAppliers cssAppliers = new DefaultCssAppliers();
    cssAppliers.setItalic(new Chunk("", pdfFont).setItalic());
    cssProperties.setCssAppliers(cssAppliers);
    cssProperties.setFontProvider(provider);

    Document doc = HtmlConverter.convertToDocument(htmlData, pdfDoc, cssProperties);
    doc.close();
    writer.close();
    outputStream.close();
}catch(Exception ex){
    throw new PDFException("PDF export to File fail",ex);
}finally{
    IOUtils.closeQuietly(outputStream);
}

需要注意的是，在设置CSS样式时，我们通过`Chunk`类的`setItalic()`方法来实现斜体。