pdfboxicepdf工具实现pdf转图片

Posted 2021-09-05 、Dong

文章目录

• 一、环境准备
• 二、pdfbox、icepdf工具实现pdf转图片
• 结尾

一、环境准备

• icepdf-core-6.1.2.jar
• pdfbox-2.0.20.jar

二、pdfbox、icepdf工具实现pdf转图片

import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.icepdf.core.pobjects.Document;
import org.icepdf.core.pobjects.Page;
import org.icepdf.core.util.GraphicsRenderingHints;

/**
 * pdf转图片工具类
 */
public class PdfToImgUtils {

    /**
     * 利用pdfbox实现pdf转图片
     * @param filePath
     * @return
     */
    public static List<String> convertToImgByPdfbox(String filePath){
//        Properties properties = System.getProperties();
//        Object encoding = properties.get("file.encoding");
//        properties.put("file.encoding", "SHIFT-JIS");
        List<String> result = new ArrayList<String>();

        String targetFormat = "jpg";
        String targetPath;

        int resolution = 300;

        File file = new File(filePath);
        PDDocument doc = null;
        try {
            doc = PDDocument.load(file);
            if (doc.isEncrypted()) {
                // doc.decrypt("TU2016");
                return result;
            }
            List<PDPage> pages = doc.getDocumentCatalog().getAllPages();
            String format = "_%0" + String.valueOf(pages.size()).length() + "d";
            for (int i = 0; i < pages.size(); i++) {
                PDPage page = pages.get(i);
                BufferedImage image = page.convertToImage(BufferedImage.TYPE_BYTE_GRAY, resolution);
                targetPath = filePath.substring(0, filePath.lastIndexOf(".")) + String.format(format, i + 1) + "." + targetFormat;
                File destFile = new File(targetPath);
                ImageIO.write(image, targetFormat, destFile);
                result.add(targetPath);
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (doc != null) {
                try {
                    doc.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            //properties.put("file.encoding", encoding);
        }
        return result;
    }


    /**
     * 利用icepdf实现pdf转图片
     * @param filePath
     * @return
     */
    public static List<String> convertToImgByIcepdf(String filePath) {
        List<String> result = new ArrayList<String>();
        Document document = null;
        //缩放比例
        float scale = 2f;
        //旋转角度
        float rotation = 0f;

        String targetFormat = "png";
        String targetPath;

        try {
            document = new Document();
            document.setFile(filePath);
            String format = "_%0" + String.valueOf(document.getNumberOfPages()).length() + "d";
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                BufferedImage image = (BufferedImage)
                        document.getPageImage(i, GraphicsRenderingHints.SCREEN, Page.BOUNDARY_CROPBOX, rotation, scale);
                RenderedImage rendImage = image;
                targetPath = filePath.substring(0, filePath.lastIndexOf(".")) + String.format(format, i + 1) + "." + targetFormat;
                File file = new File(targetPath);
                ImageIO.write(rendImage, targetFormat, file);
                result.add(targetPath);
                image.flush();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            document.dispose();
        }
        return result;
    }


    public static void main(String args[]) throws Exception {
        Long start = System.currentTimeMillis();
        PdfToImgUtils.convertToImgByIcepdf("C:\\\\Users\\\\Administrator\\\\Desktop\\\\ocr\\\\111.pdf");
        System.out.println((System.currentTimeMillis() - start) / 1000);

    }
}

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结尾

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