pdf转图片

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;

/**
 * Create by tianqing on 2019/3/30.
 */
public class Pdf2ImageUtil {

    private static final Logger logger = LoggerFactory.getLogger(Pdf2ImageUtil.class);

    public static void main(String[] args) {

        buildPng("/Users/zmx/Downloads/2201.pdf", "/Users/zmx/Downloads/220117.png");

    }



    public static void buildPng(String sourcePdf, String outFilePath) {
        buildByPdfbox(sourcePdf,outFilePath);
    }

    private static void buildByIcepdf(String sourcePdf, String outFilePath) {
        /*Pdf2ImageUtil.registerNewFont(PDF_FONT_PATH + "simsun.ttf");
        Document document = new Document();
        try {
            document.setFile(sourcePdf);
        } catch (Exception e) {
            logger.info("[Pdf2ImageUtil - buildPng] 读取pdf失败", e);
        }
        float scale = 2.5f;//缩放比例
        float rotation = 0f;//旋转角度

        int len = document.getNumberOfPages();
        int[][] ImageArrays = new int[len][];
        BufferedImage[] images = new BufferedImage[len];
        int dst_height = 0;
        // 生成新图片
        try {
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                images[i] = (BufferedImage) document.getPageImage(i, GraphicsRenderingHints.SCREEN, org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation, scale);
                RenderedImage rendImage = images[i];
                int width = images[i].getWidth();
                int height = images[i].getHeight();
                // 从图片中读取RGB 像素
                ImageArrays[i] = new int[width * height];
                ImageArrays[i] = images[i].getRGB(0, 0, width, height, ImageArrays[i], 0, width);
                dst_height += height;
                images[i].flush();
            }
            int dst_width = images[0].getWidth();

            BufferedImage ImageNew = new BufferedImage(dst_width, dst_height, BufferedImage.TYPE_INT_RGB);
            int height_i = 0;
            for (int i = 0; i < images.length; i++) {
                ImageNew.setRGB(0, height_i, dst_width, images[i].getHeight(), ImageArrays[i], 0, dst_width);
                height_i += images[i].getHeight();
            }

            File outFile = new File(outFilePath);
            ImageIO.write(ImageNew, "png", outFile);// 写图片 ，输出到硬盘
        } catch (Exception e) {
            e.printStackTrace();
        }
        document.dispose();*/
    }

    public static void buildByPdfbox(String pdfPath, String imgPath) {
        try {
            System.setProperty("sun.java2d.cmm", "sun.java2d.cmm.kcms.KcmsServiceProvider");
            //图像合并使用参数
            // 总宽度
            int width = 0;
            // 保存一张图片中的RGB数据
            int[] singleImgRGB;
            int shiftHeight = 0;
            //保存每张图片的像素值
            BufferedImage imageResult = null;
            //利用PdfBox生成图像
            PDDocument pdDocument = PDDocument.load(new File(pdfPath));
            PDFRenderer renderer = new PDFRenderer(pdDocument);
            //循环每个页码
            for (int i = 0, len = pdDocument.getNumberOfPages(); i < len; i++) {
                BufferedImage image = renderer.renderImageWithDPI(i, 105, ImageType.RGB);
                int imageHeight = image.getHeight();
                int imageWidth = image.getWidth();
                //计算高度和偏移量
                if (i == 0) {
                    //使用第一张图片宽度;
                    width = imageWidth;
                    //保存每页图片的像素值
                    imageResult = new BufferedImage(width, imageHeight * len, BufferedImage.TYPE_INT_RGB);
                } else {
                    // 计算偏移高度
                    shiftHeight += imageHeight;
                }
                singleImgRGB = image.getRGB(0, 0, width, imageHeight, null, 0, width);
                // 写入流中
                imageResult.setRGB(0, shiftHeight, width, imageHeight, singleImgRGB, 0, width);
            }
            pdDocument.close();
            // 写图片
            ImageIO.write(imageResult, "png", new File(imgPath));
        } catch (Exception e) {
            logger.error("PDF转图片失败",e);
        }
    }
}