PDF 转 JPG

 

    吐槽弄了半天， iteye 的编辑器今天是有问题啊， 死活弄不好，插入不了代码，每次插入都显示到顶部，好烦

  

    没心思好好写博客了， 直接看代码吧：

   

   1、 引入相关的jar

 

<!-- PDF 转 图片 -->
		<dependency>
		    <groupId>com.sun.pdfview</groupId>
		    <artifactId>pdfrenderer</artifactId>
		    <version>0.9.1-patched</version>
		</dependency>

 

 2、 直接运行代码

 

private static void PdfToJpg() throws Exception {
        
        File file = new File("D:\\upload\\xxx.pdf"); // PDF路径 
        
        String getPdfFilePath = "D:\\upload\\img"; // 生成图片路径 
        
        
        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);  
 
        System.out.println("页数： " + pdffile.getNumPages());  
       
        int pageNum = pdffile.getNumPages();
        
        for (int i = 1; i <= pageNum; i++) {
            
            // draw the first page to an image  
            PDFPage page = pdffile.getPage(i);  
            
            int width = (int) page.getBBox().getWidth();
            int height = (int) page.getBBox().getHeight();
            
            System.out.println ("width:" + width);
            System.out.println ("height:" + height);
            
            // get the width and height for the doc at the default zoom  
            Rectangle rect = new Rectangle(0, 0, width, height);  
 
            int n = 2; //图片清晰度（n>0且n<7）   pdf放大参数
            
            // 放大pdf到n倍，创建图片
            int imgW = width * n;
            int imgH = height * n;
            
            // generate the image  
            Image img = page.getImage(imgW, imgH, // width &  
                                                                // height  
                    rect, // clip rect  
                    null, // null for the ImageObserver  
                    true, // fill background with white  
                    true // block until drawing is done  
                    );  
 
            BufferedImage tag = new BufferedImage(imgW, imgH,BufferedImage.TYPE_INT_RGB);  
            tag.getGraphics().drawImage(img, 0, 0, imgW, imgH,null); 
           
            FileOutputStream out = new FileOutputStream(getPdfFilePath + File.separator + i + ".jpg"); // 输出到文件流
            System.out.println("成功保存图片到 ：  " +getPdfFilePath+  File.separator + i + ".jpg");
           
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            // 设置图片质量
            /*JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam (tag);
            param.setQuality (1f, true); //1f~0.01f是提高生成的图片质量
            encoder.setJPEGEncodeParam (param);*/
            
            encoder.encode(tag); // JPEG编码  
 
            out.close();  
        }  
 
    }