java 多页pdf转化为多张图片

相关jar包：

		<dependency>
			<groupId>com.itextpdf</groupId>
			<artifactId>itext-asian</artifactId>
			<version>5.2.0</version>
		</dependency>
		<dependency>
			<groupId>org.apache.pdfbox</groupId>
			<artifactId>pdfbox</artifactId>
			<version>2.0.0</version>
		</dependency>
		<dependency>
			<groupId>org.apache.pdfbox</groupId>
			<artifactId>fontbox</artifactId>
			<version>2.0.0</version>
		</dependency>
		<dependency>
			<groupId>com.itextpdf</groupId>
			<artifactId>itextpdf</artifactId>
			<version>5.5.13</version>
		</dependency>

相关代码：

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import java.util.UUID;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

	/**
	 * 	 将多页pdf转化为多张图片
	 * @param pdfPath 表示pdf的路径
	 * @return 转化后的图片的路径集合
	 * @throws IOException
	 */
	public static List<String> pdfPathToImagePaths(String pdfPath) throws IOException {
		log.info("将多页pdf转化为图片，pdf路径为："+pdfPath);
		File pdfFile = new File(pdfPath);
		PDDocument pdDocument = PDDocument.load(pdfFile);
		int pageCount = pdDocument.getNumberOfPages();
		PDFRenderer pdfRenderer = new PDFRenderer(pdDocument);
		List<String> imagePathList=new ArrayList<>();
		String fileParent = pdfFile.getParent();
		for (int pageIndex=0; pageIndex<pageCount; pageIndex++) {
			String imgPath = fileParent + File.separator +UUID.randomUUID().toString()+".png";
			BufferedImage image = pdfRenderer.renderImageWithDPI(pageIndex, 105, ImageType.RGB);
			ImageIO.write(image, "png", new File(imgPath));
			imagePathList.add(imgPath);
			log.info("第{}张生成的图片路径为：{}",pageIndex,imgPath);
		}
		pdDocument.close();
		return imagePathList;
	}

这里的UUID.randomUUID()是产生一个随机的32位数字字母，作为文件名。
也可以自己去找些工具类，或者改用具体的时间作为文件名。

参考资料：
https://blog.csdn.net/u013405574/article/details/51086186