使用java实现pdf文件转换为jpg或者png(可以批量操作)

使用java代码实现将pdf转换为图片格式。支持归类，支持pdf多页分页面转换存放。

需求背景：有几百个文件夹，每个文件夹里有两个pdf文件，我需要把这两个pdf转换为jpg,pdf内容有很多页，分页转换并友好命名，最后归类在一个文件夹里。

解决过程：在文件夹下以pdf文件的名称创建文件夹，将pdf分页转换,以"pdf名称_1.jpg"命名，归类在目录下。

<dependency><groupId>org.icepdf.os</groupId><artifactId>icepdf-core</artifactId><version>6.2.2</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.6</version></dependency>

package org.example;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 mons.io.FileUtils;import org.icepdf.core.pobjects.Document;import org.icepdf.core.util.GraphicsRenderingHints;import org.omg.PortableServer.LIFESPAN_POLICY_ID;import sun.misc.BASE64Decoder;public class pdfToJpgUtil {static BASE64Decoder decoder = new sun.misc.BASE64Decoder();/*** pdf文件转jpg** @param pdffilepath*/public static void pdf2jpg(String pdffilepath, String jpgfilepath) throws Exception {Document document = new Document();document.setFile(pdffilepath);float scale = 2.5f;// 缩放比例float rotation = 0f;// 旋转角度for (int i = 0; i < document.getNumberOfPages(); i++) {String exportJpgFilePath = "";BufferedImage image = (BufferedImage) document.getPageImage(i,GraphicsRenderingHints.SCREEN,org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation,scale);RenderedImage rendImage = image;try {exportJpgFilePath = jpgfilepath + "_" + (i + 1) + ".jpg";File file = new File(exportJpgFilePath);ImageIO.write(rendImage, "jpg", file);} catch (IOException e) {e.printStackTrace();}image.flush();}document.dispose();}/*** 递归删除文件** @param path*/public static void deleteFile(String path) {File file = FileUtils.getFile(path);if (file.isDirectory()) {String[] list = file.list();if (null != list) {for (int i = 0; i < list.length; i++) {deleteFile(path + File.separator + list[i]);}}}boolean delete = file.delete();if (!delete) {System.out.println("error:File delete failed!");}}public static List<String> getFiles(String path) {List<String> files = new ArrayList<String>();File file = new File(path);File[] tempList = file.listFiles();int dirNum = tempList.length;System.out.println("文件夹总数：" + dirNum + " 个。");System.out.println("开始处理所有文件夹。");for (int i = 0; i < tempList.length; i++) {if (tempList[i].isFile()) {System.out.println("***********************************************************");System.out.println("****警告：主目录下有文件，请查看。文件名：" + tempList[i].toString());System.out.println("***********************************************************");}//如果是文件夹，需要以这个文件夹目录为基准，逐个进行转换if (tempList[i].isDirectory()) {System.out.println("*******************开始处理：" + tempList[i].toString() + "*******************");String pdf = tempList[i].getPath();File pdfFile = new File(pdf);File[] pdfFileList = pdfFile.listFiles();for (int j = 0; j < pdfFileList.length; j++) {if (pdfFileList[j].isFile()) {//文件名称String fileName = pdfFileList[j].getName();//文件的全量路劲String filePath = pdfFileList[j].getPath();if (!fileName.contains(".pdf")) {System.out.println("error:该目录存在非pdf文件，请查看。文件路径：" + pdfFileList[j].getPath());continue;}//截取名称创建文件夹String subFileName = fileName.substring(0, fileName.indexOf(".pdf"));String exportDir = pdf + "\\" + subFileName;File createDir = new File(exportDir);if (createDir.exists()) {deleteFile(exportDir);}createDir.mkdir();//开始转换try {pdf2jpg(filePath, exportDir + "\\" + subFileName);} catch (Exception e) {e.printStackTrace();}}}System.out.println("*******************处理完成：" + tempList[i].toString() + "*******************");}}return null;}/*** @param args*/public static void main(String[] args) throws Exception {getFiles("E:\\bzh3");System.out.println("E:\\bzh3 完成");Thread.sleep(5000);getFiles("E:\\bzh6");System.out.println("E:\\bzh6 完成");}}

具体实现过程可以看代码，下面附效果图：