PDF
Renderer是LGPL许可的纯Java库，它使此过程变得简单（摘自其示例页面）：
File file = new File("test.pdf");RandomAccessFile raf = new RandomAccessFile(file, "r");FileChannel channel = raf.getChannel();ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());PDFFile pdffile = new PDFFile(buf);// draw the first page to an imagePDFPage page = pdffile.getPage(0);//get the width and height for the doc at the default zoom Rectangle rect = new Rectangle(0,0, (int)page.getBBox().getWidth(), (int)page.getBBox().getHeight());//generate the imageImage img = page.getImage( rect.width, rect.height, //width & height rect, // clip rect null, // null for the ImageObserver true, // fill background with white true // block until drawing is done );
