Java实现pdf文件转图片

爱被打了一巴掌 2022-11-30 15:40 299阅读 0赞

> Java实现pdf文件转换为图片  
> 可根据自己的逻辑进行修改

# pom依赖 #

<dependency>
      <groupId>org.apache.pdfbox</groupId>
      <artifactId>pdfbox</artifactId>
      <version>2.0.12</version>
    </dependency>

# 封装utils工具 #

PDFToImgUtil

import org.apache.pdfbox.pdmodel.PDDocument;
    
    import javax.imageio.ImageIO;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.UUID;
    import com.lowagie.text.pdf.PdfReader;
    import org.apache.pdfbox.rendering.PDFRenderer;
    
    /**
     * @author 漫路h
     * Created by 2020-08-24
     */
    
    public class PDFToImgUtil {
        /**
         * main方法
         */
        public static void main(String[] args) {
            pdfToImage("D:\\123.pdf", "D:", 150);
        }
    
        /**
         * PDF文件转PNG图片，全部页数
         *
         * @param PdfFilePath  pdf完整路径
         * @param dstImgFolder 图片存放的文件夹
         * @param dpi dpi越大转换后越清晰，相对转换速度越慢
         * @return 返回转换后图片集合list
         */
        public static List<File> pdfToImage(String PdfFilePath, String dstImgFolder, int dpi) {
            UUID uuid = UUID.randomUUID();
            String uuId = uuid.toString();
            System.out.println(uuId);
            File file = new File(PdfFilePath);
            //定义集合保存返回图片数据
            List<File> fileList = new ArrayList<File>();
            @SuppressWarnings("resource")//抑制警告
            PDDocument pdDocument = new PDDocument();
            try {
                //String imagePDFName = file.getName().substring(0, dot); // 获取图片文件名
                String imgFolderPath = null;
                if (dstImgFolder.equals("")) {
                    imgFolderPath = dstImgFolder + File.separator + uuId;// 获取图片存放的文件夹路径
                } else {
                    imgFolderPath = dstImgFolder + File.separator + uuId;
                }
                if (createDirectory(imgFolderPath)) {
                    pdDocument = PDDocument.load(file);
                    PDFRenderer renderer = new PDFRenderer(pdDocument);
                    /* dpi越大转换后越清晰，相对转换速度越慢 */
                    PdfReader reader = new PdfReader(PdfFilePath);
                    int pages = reader.getNumberOfPages();
                    System.out.println("pdf总共多少页-----" + pages);
                    StringBuffer imgFilePath = null;
                    for (int i = 0; i < pages; i++) {
                        String imgFilePathPrefix = imgFolderPath + File.separator + "study";
                        System.out.println("imgFilePathPrefix=====" + imgFilePathPrefix);
                        imgFilePath = new StringBuffer();
                        imgFilePath.append(imgFilePathPrefix);
                        imgFilePath.append("-");
                        imgFilePath.append(String.valueOf(i));
                        imgFilePath.append(".jpg");
                        File dstFile = new File(imgFilePath.toString());
                        BufferedImage image = renderer.renderImageWithDPI(i, dpi);
                        ImageIO.write(image, "png", dstFile);
                        fileList.add(dstFile);
                    }
                    System.out.println("PDF文档转PNG图片成功！");
                    return fileList;
                } else {
                    System.out.println("PDF文档转PNG图片失败：" + "创建" + imgFolderPath + "失败");
                    return null;
                }
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
        }
    
        //创建文件夹
        private static boolean createDirectory(String folder) {
            File dir = new File(folder);
            if (dir.exists()) {
                return true;
            } else {
                return dir.mkdirs();
            }
        }
        //删除文件夹
        //param folderPath 文件夹完整绝对路径
        public static void delFolder(String folderPath) {
            try {
                delAllFile(folderPath); //删除完里面所有内容
                String filePath = folderPath;
                filePath = filePath.toString();
                java.io.File myFilePath = new java.io.File(filePath);
                myFilePath.delete(); //删除空文件夹
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        //删除指定文件夹下所有文件
        //param path 文件夹完整绝对路径
        public static boolean delAllFile(String path) {
            boolean flag = false;
            File file = new File(path);
            if (!file.exists()) {
                return flag;
            }
            if (!file.isDirectory()) {
                return flag;
            }
            String[] tempList = file.list();
            File temp = null;
            for (int i = 0; i < tempList.length; i++) {
                if (path.endsWith(File.separator)) {
                    temp = new File(path + tempList[i]);
                } else {
                    temp = new File(path + File.separator + tempList[i]);
                }
                if (temp.isFile()) {
                    temp.delete();
    
                }
                if (temp.isDirectory()) {
                    delAllFile(path + "/" + tempList[i]);//先删除文件夹里面的文件
                    delFolder(path + "/" + tempList[i]);//再删除空文件夹
                    flag = true;
                }
            }
            return flag;
        }
    }