java pdf转base64图片工具类

- 依赖
- 工具类

依赖

		<dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.13</version></dependency>

工具类


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 sun.misc.BASE64Encoder;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;/*** @Author dume* @Description PDF转base64图片* @Date 2023/03/28/15:01* @Version 1.0*/
public class PdfToImgUtils {private static Logger log = LoggerFactory.getLogger(PdfToImgUtils.class);public static final float DEFAULT_DPI = 105;public static void main(String[] args) {long start = System.currentTimeMillis();
//        System.out.println(getBase64("https://www.baidu.com/pdffile/20020230328132145.pdf"));
//        long end = System.currentTimeMillis();
//        System.out.println(end - start + "ms");}public static String getBase64(String pdfURL) {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;InputStream pdfInputStream = null;ByteArrayOutputStream pdfoutStream = null;ByteArrayOutputStream bos = null;PDDocument pdDocument = null;byte[] buffer = null;try {// 创建URLURL url = new URL(pdfURL);// 创建链接HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(10 * 1000);conn.setReadTimeout(10 * 1000);pdfInputStream = conn.getInputStream();pdfoutStream = new ByteArrayOutputStream();// 将内容读取内存中buffer = new byte[4926];int lenn = -1;while ((lenn = pdfInputStream.read(buffer)) != -1) {pdfoutStream.write(buffer, 0, lenn);}buffer = pdfoutStream.toByteArray();pdDocument = PDDocument.load(buffer);PDFRenderer renderer = new PDFRenderer(pdDocument);int pageCount = pdDocument.getNumberOfPages();//循环每个页码for (int i = 0; i < pageCount; i++) {BufferedImage image = renderer.renderImageWithDPI(i, DEFAULT_DPI, 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 * pageCount, 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);}bos = new ByteArrayOutputStream();ImageIO.write(imageResult, "jpg", bos);byte[] bytes = bos.toByteArray();if (null == bytes) {throw new Exception("获取图片为空！");}String base = new BASE64Encoder().encode(bytes).trim().replaceAll("\n", "").replaceAll("\r", "");pdDocument.close();// return "data:image/jpg;base64," + base;return base;} catch (Exception e) {e.printStackTrace();} finally {try {if (null != pdfInputStream) {pdfInputStream.close();}} catch (Exception e) {e.printStackTrace();}try {if (null != pdfoutStream) {pdfoutStream.close();}} catch (Exception e) {e.printStackTrace();}try {if (null != bos) {bos.close();}} catch (Exception e) {e.printStackTrace();}try {if (null != pdDocument) {pdDocument.close();}} catch (Exception e) {e.printStackTrace();}}return null;}}