我刚刚将PDFBox版本从1.8升级到了2.0。
Migration说.convertToImage()
已被删除,并且在BufferedImage
的示例代码中没有一行,但是在.writeImage()
中使用
他们的代码:
PDDocument document = PDDocument.load(new File(pdfFilename));
PDFRenderer pdfRenderer = new PDFRenderer(document);
int pageCounter = 0;
for (PDPage page : document.getPages())
{
pdfRenderer.renderImageWithDPI(pageCounter, 300, ImageType.RGB);
// suffix in filename will be used as the file format
ImageIOUtil.writeImage(bim, pdfFilename + "-" + (pageCounter++) + ".png", 300);
}
document.close();
我相信BufferedImage在
ImageIOUtil.writeImage(bim, pdfFilename + "-" + (pageCounter++) + ".png", 300);
中用作bim
。如果删除了.convertToImage()
,我应该如何实现BufferedImage?第二件事是关于
.decrypt()
。他们没有提到.decrypt()
。我应该用什么代替.decrypt()
?我的整个代码:
try {
String sourceDir = "/home/linux/books/text.pdf";
File sourceFile = new File(sourceDir);
PDDocument document = PDDocument.load(sourceFile);
PDFRenderer pdfRenderer = new PDFRenderer(document);
if (document.isEncrypted()) {
try {
System.out.println("Trying to decrypt it...");
document.decrypt("");
// error says: The method decrypt(String) is undefined for the type PDDocument.
// it was working on pdfbox 1.8.
document.setAllSecurityToBeRemoved(true);
System.out.println("The file has been decrypted in .");
}
catch (Exception e) {
throw new Exception("cannot be decrypted. ", e);
}
}
PDPage firstPage = (PDPage) document.getDocumentCatalog().getPages().get(0);
pdfRenderer.renderImageWithDPI(0, 300, ImageType.RGB);
String fileName = sourceFile.getName().replace(".pdf", "");
BufferedImage image = firstPage.convertToImage(BufferedImage.TYPE_INT_RGB, 300);
ImageIOUtil.writeImage(image , fileName+".jpg",300);
document.close();
} catch (Exception e) {
e.printStackTrace();
}
入门内容正在建设中。这就是为什么我无法检查我的问题。
最佳答案
我相信BufferedImage
在ImageIOUtil.writeImage(bim, pdfFilename + "-" + (pageCounter++) + ".png", 300);
中用作bim
。如果删除了.convertToImage()
,我应该如何实现BufferedImage?
实际上,迁移指南中缺少一点点,应该是
BufferedImage bim = pdfRenderer.renderImageWithDPI(pageCounter, 300, ImageType.RGB);
代替
pdfRenderer.renderImageWithDPI(pageCounter, 300, ImageType.RGB);
第二件事是关于
.decrypt()
。他们没有提到.decrypt()
。我应该用什么代替.decrypt()
?PDDocument
现在有多个load
重载,它们也接受密码,例如/**
* Parses a PDF. Unrestricted main memory will be used for buffering PDF streams.
*
* @param file file to be loaded
* @param password password to be used for decryption
*
* @return loaded document
*
* @throws IOException in case of a file reading or parsing error
*/
public static PDDocument load(File file, String password) throws IOException
要么
/**
* Parses a PDF. The given input stream is copied to the memory to enable random access to the pdf.
* Unrestricted main memory will be used for buffering PDF streams.
*
* @param input stream that contains the document.
* @param password password to be used for decryption
*
* @return loaded document
*
* @throws IOException in case of a file reading or parsing error
*/
public static PDDocument load(InputStream input, String password)
throws IOException