如果需要在网页上预览pdf文档的话,可以将pdf转换为flash,同时也可将pdf转换为图片文件。以下为使用 pdfbox 对pdf进行转换的实例。
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);//合并多张图片为一张图片 } }finally{ try{ if(pdDoc != null){ pdDoc.close(); } if(output != null){ output.close(); } }catch(IOException e){ e.printStackTrace(); } } }
其中合并多张图片为一张图片的方法请参考: mergeMultiImageFiles