如果需要在網頁上預覽pdf文件的話，可以將pdf轉換為flash，同時也可將pdf轉換為圖片檔案。以下為使用 pdfbox 對pdf進行轉換的例項。

      需要用到的jar包：pdfbox-1.8.2.jar、fontbox-1.8.2.jar

public static void convertPdf2Image(String pdfFilePath,String imageFilePath)
	throws IOException
	{
		File pdfFile = new File(pdfFilePath);
		File imageFile = new File(imageFilePath);
		File imageFileParent = new File(imageFile.getParent());
		OutputStream output = null;
		PDDocument pdDoc = null;
		List<File> files = new ArrayList<File>();
		try{
			if(pdfFile.exists()){
				if(!imageFileParent.exists()){
					imageFileParent.mkdirs();
				}
				pdDoc = PDDocument.load(pdfFile);
				int pageCount = pdDoc.getNumberOfPages();
				List pages = pdDoc.getDocumentCatalog().getAllPages();
				for(int i = 0; i < pages.size(); i++){
					PDPage page = (PDPage)pages.get(i);
					BufferedImage image = page.convertToImage();
					Iterator iter = ImageIO.getImageWritersBySuffix("jpg");
					ImageWriter writer = (ImageWriter)iter.next();
					File tempFile = new File(imageFileParent.getPath(),i+imageFile.getName());
					files.add(tempFile);
					output = new FileOutputStream(tempFile);
					ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
					writer.setOutput(imageOut);
					writer.write(new IIOImage(image,null,null));
					output.close();
				}
				pdDoc.close();
				mergeMultiImageFiles(files,imageFile);//合併多張圖片為一張圖片
			}
			
		}finally{
			try{
				if(pdDoc != null){
					pdDoc.close();
				}
				if(output != null){
					output.close();
				}
			}catch(IOException e){
				e.printStackTrace();
			}
		}
	}