pdf转成图片

http://blog.csdn.net/wydhao123/article/details/51596028

jar commons-logging.jar、 pdfbox-2.0.1.jar、fontbox-2.0.1.jar

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;  

import javax.imageio.ImageIO;  

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;  

public class PDFBOXCreate {  

    public static void main(String[] args)throws Exception {
        long start = System.currentTimeMillis();
        String filepath = "D:/Users/ex-wangyide001/workspace/testsrc/1.pdf";
        PDDocument document = new PDDocument();
        File pdfFile = new File(filepath);
        document = PDDocument.load(pdfFile, (String)null);
        int size = document.getNumberOfPages();
        List<BufferedImage> piclist = new ArrayList();
        for(int i=0 ; i < size; i++){
            BufferedImage  image = new PDFRenderer(document).renderImageWithDPI(i,130,ImageType.RGB);
            piclist.add(image);
        }
        document.close();
        yPic(piclist,"D:/Users/ex-wangyide001/workspace/testsrc/PDFBox1.jpg");
       /* FileOutputStream out = new FileOutputStream("D:/Users/ex-wangyide001/workspace/testsrc/yanglaoxian/PDFBox-"+i+".jpg");
        ImageIO.write(image, "jpg", out);
        out.close();*/
        long end = System.currentTimeMillis();
        System.out.println(end-start);
    }  

    /**
     * 将宽度相同的图片，竖向追加在一起 ##注意：宽度必须相同
     *
     * @param piclist
     *            文件流数组
     * @param outPath
     *            输出路径
     */
    public static void yPic(List<BufferedImage> piclist, String outPath) {// 纵向处理图片
        if (piclist == null || piclist.size() <= 0) {
            System.out.println("图片数组为空!");
            return;
        }
        try {
            int height = 0, // 总高度
            width = 0, // 总宽度
            _height = 0, // 临时的高度 , 或保存偏移高度
            __height = 0, // 临时的高度，主要保存每个高度
            picNum = piclist.size();// 图片的数量
            File fileImg = null; // 保存读取出的图片
            int[] heightArray = new int[picNum]; // 保存每个文件的高度
            BufferedImage buffer = null; // 保存图片流
            List<int[]> imgRGB = new ArrayList<int[]>(); // 保存所有的图片的RGB
            int[] _imgRGB; // 保存一张图片中的RGB数据
            for (int i = 0; i < picNum; i++) {
                buffer = piclist.get(i);
                heightArray[i] = _height = buffer.getHeight();// 图片高度
                if (i == 0) {
                    width = buffer.getWidth();// 图片宽度
                }
                height += _height; // 获取总高度
                _imgRGB = new int[width * _height];// 从图片中读取RGB
                _imgRGB = buffer
                        .getRGB(0, 0, width, _height, _imgRGB, 0, width);
                imgRGB.add(_imgRGB);
            }
            _height = 0; // 设置偏移高度为0
            // 生成新图片
            BufferedImage imageResult = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_BGR);
            for (int i = 0; i < picNum; i++) {
                __height = heightArray[i];
                if (i != 0)
                    _height += __height; // 计算偏移高度
                imageResult.setRGB(0, _height, width, __height, imgRGB.get(i),
                        0, width); // 写入流中
            }
            File outFile = new File(outPath);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write(imageResult, "jpg", out);// 写图片
            byte[] b = out.toByteArray();
            FileOutputStream output = new FileOutputStream(outFile);
            output.write(b);
            out.close();
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}