在 Linux 上裁剪 pdf 文件时，Courier 粗体字体未正确呈现

Question

我正在使用 pdfbox 2.0.21 从 pdf 中提取页面作为图像并将它们添加到 word 文档中。当我在 Windows 环境中生成文件时，文档字体会正确呈现，而在测试环境（centos 7）上运行时，它们会呈现为下图

我怀疑 pddocument 没有 courier 粗体字体，因此在渲染图像时它默认为一些本机设置。我该如何解决这个问题？我没有看到任何强制或指定字体集的方法。 提取图像的代码如下

        PDDocument document = null;
        try {   
            
            document = PDDocument.load(sourceOfImages);
            
            
            PDFRenderer pdfRenderer = new PDFRenderer(document);
            
            for (int page = 0; page < document.getNumberOfPages(); ++page)
            {
                logger.debug( " page  " + page + "of " + document.getNumberOfPages());
                
                ReportImage reportImage = new ReportImage();
                try (ByteArrayOutputStream pageImagesOutputStream = new ByteArrayOutputStream())
                {

                
                    
                    BufferedImage bim = pdfRenderer.renderImageWithDPI(page, DPI, ImageType.RGB);                   

                    logger.debug( " start clear metadata area ");
                    clearImageArea(bim,whiteAreaMetadataX,whiteAreaMetadataY,whiteAreaMetadataW,whiteAreaMetadataH);
                    logger.debug( " end clear metadata area ");

                    
                    logger.debug( " creating png ");
                    final int[] colourMap = {   0x00000000, 0xffffffff, 0xff000000, 0xff353535, 0xff888888, 0xff969696, 0xff237fe9, 0xffff0000 };
                    IndexColorModel colorModel = new IndexColorModel(8, colourMap.length, colourMap, 0, true, 0, DataBuffer.TYPE_BYTE );
                    
                    
                    BufferedImage image = new BufferedImage(ReportHelper.getA4W(DPI), ReportHelper.getA4H(DPI), BufferedImage.TYPE_3BYTE_BGR);
                    image.getGraphics().drawImage(bim, 0, 0, null);                 
                    ImageIO.write(image, "PNG", pageImagesOutputStream);
                    
                    double cmWidth = 21;
                    double cmHeight = 29.7;

                    pageImagesOutputStream.flush();
                    logger.debug( "end creating png ");
                    
                    reportImage.setImage(pageImagesOutputStream.toByteArray());
                    reportImage.setWidth(cmWidth);
                    reportImage.setHeight(cmHeight);
                    reportImage.getMetadata().getPDFInfoDTO().setFileName(fileName);
                    reportImage.getMetadata().setPageNumber(page);
                    
                    images.add(reportImage);
                }
                catch(Exception ex)
                {
                    logger.error("failed reading images at page" + page, ex);
                    throw new IOException(ex);
                }
                logger.debug( " end page " + page);
            }
            logger.debug( " end file elaboration " + fileName + " size " + images.size());
            return images;
        }
        catch(Exception ex)
        {
            logger.error("failed reading document", ex);
            throw new IOException(ex);
        }

Answer 1

解决了在 docker 镜像上安装 mscorefonts