我创建了一个带有iText的文档,我想将此文档(保存为PDF文件)转换为图像。为此我使用PDFBox,它想要一个PDDocument作为输入。我使用以下代码:
@SuppressWarnings("unchecked")
public static Image convertPDFtoImage(String filename) {
Image convertedImage = null;
try {
File sourceFile = new File(filename);
if (sourceFile.exists()) {
PDDocument document = PDDocument.load(filename);
List<PDPage> list = document.getDocumentCatalog().getAllPages();
PDPage page = list.get(0);
BufferedImage image = page.convertToImage();
//Part where image gets scaled to a smaller one
int width = image.getWidth()*2/3;
int height = image.getHeight()*2/3;
BufferedImage scaledImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = scaledImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, width, height, null);
graphics2D.dispose();
convertedImage = SwingFXUtils.toFXImage(scaledImage, null);
document.close();
} else {
System.err.println(sourceFile.getName() +" File not exists");
}
}
catch (Exception e) {
e.printStackTrace();
}
return convertedImage;
}
目前,我从已保存的文件中加载文档。但我想在Java内部执行此操作。
所以我的问题是:如何将文档转换为PDDocument?
非常感谢任何帮助!
答案 0 :(得分:1)
您可以做的是将itext文件保存到ByteArrayOutputStream中,将其转换为ByteArrayInputStream。
Document document = new Document();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PdfWriter writer = PdfWriter.getInstance(document, baos);
document.open();
document.add(new Paragraph("Hello World!"));
document.close();
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
PDDocument document = PDDocument.load(bais);
当然文件不应该太大,否则你会遇到内存问题。