JAVA实现PDF转HTML文档的示例代码
本文是基于PDF文档转PNG图片,然后进行图片拼接，拼接后的图片转为base64字符串，然后拼接html文档写入html文件实现PDF文档转HTML文档。
引入Maven依赖
<!-- https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox --> <dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.12</version> </dependency>
工具实现类
package com.frame.utils;import org.apache.pdfbox.pdmodel.PDDocument;import org.apache.pdfbox.rendering.PDFRenderer;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.*;/** * PDF文档转HTML文档 * @author LXW * @date 2020/6/17 16:45 */public class PdfConvertHtmlUtil { /** * 日志对象 */ private static Logger logger = LoggerFactory.getLogger(PdfConvertHtmlUtil.class); /** * PDF文档流转Png * @param pdfFileInputStream * @return BufferedImage */ public static BufferedImage pdfStreamToPng(InputStream pdfFileInputStream){PDDocument doc = null;PDFRenderer renderer = null;try { doc = PDDocument.load(pdfFileInputStream); renderer = new PDFRenderer(doc); int pageCount = doc.getNumberOfPages(); BufferedImage image = null; for (int i = 0; i < pageCount; i++) {if (image != null) { image = combineBufferedImages(image, renderer.renderImageWithDPI(i, 144));}if (i == 0) { image = renderer.renderImageWithDPI(i, 144); // Windows native DPI}// BufferedImage srcImage = resize(image, 240, 240);//产生缩略图 } return combineBufferedImages(image);} catch (IOException e) { e.printStackTrace();}finally { try {if(doc != null){doc.close();} } catch (IOException e) {e.printStackTrace(); }}return null; } /** *BufferedImage拼接处理，添加分割线 * @param images * @return BufferedImage */ public static BufferedImage combineBufferedImages(BufferedImage... images) {int height = 0;int width = 0;for (BufferedImage image : images) {//height += Math.max(height, image.getHeight()); height += image.getHeight(); width = image.getWidth();}BufferedImage combo = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);Graphics2D g2 = combo.createGraphics();int x = 0;int y = 0;for (BufferedImage image : images) {//int y = (height - image.getHeight()) / 2; g2.setStroke(new BasicStroke(2.0f));// 线条粗细 g2.setColor(new Color(193, 193, 193));// 线条颜色 g2.drawLine(x, y, width, y);// 线条起点及终点位置 g2.drawImage(image, x, y, null);//x += image.getWidth(); y += image.getHeight();}return combo; } /** * 通过Base64创建HTML文件并输出html文件 * @param base64 * @param htmlPath html保存路径 */ public static void createHtmlByBase64(String base64,String htmlPath) {StringBuilder stringHtml = new StringBuilder();PrintStream printStream = null;try { // 打开文件 printStream = new PrintStream(new FileOutputStream(htmlPath));} catch (FileNotFoundException e) { e.printStackTrace();}// 输入HTML文件内容stringHtml.append('<html><head>');stringHtml.append('<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>');stringHtml.append('<title></title>');stringHtml.append('</head>');stringHtml.append('<body + ' text-align: center;rn' + ' background-color: #C1C1C1;rn' + ''>');stringHtml.append('<img src='data:image/png;base64,' + base64 + '' />');stringHtml.append('<a name='head' style='position:absolute;top:0px;'></a>');//添加锚点用于返回首页stringHtml.append('<a href='https://www.haobala.com/bcjs/4659.html#head'>回到首页</a>');stringHtml.append('</body></html>');try { // 将HTML文件内容写入文件中 printStream.println(stringHtml.toString());} catch (Exception e) { e.printStackTrace();}finally { if(printStream != null){printStream.close();}} } /** * bufferedImage 转为 base64编码 * @param bufferedImage * @return */ public static String bufferedImageToBase64(BufferedImage bufferedImage) {ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();String png_base64 = '';try { ImageIO.write(bufferedImage, 'png', byteArrayOutputStream);// 写入流中 byte[] bytes = byteArrayOutputStream.toByteArray();// 转换成字节 BASE64Encoder encoder = new BASE64Encoder(); // 转换成base64串 删除 rn png_base64 = encoder.encodeBuffer(bytes).trim() .replaceAll('n', '') .replaceAll('r', '');} catch (IOException e) { e.printStackTrace();}return png_base64; }}
测试Demo
public static void main(String[] args) {File file = new File('F:111FilesMySQL查询语句大全集锦(经典珍藏).pdf');String htmlPath = 'F:111FilesMySQL查询语句大全集锦(经典珍藏).html';InputStream inputStream = null;BufferedImage bufferedImage = null;try { inputStream = new FileInputStream(file); bufferedImage = pdfStreamToPng(inputStream); String base64_png = bufferedImageToBase64(bufferedImage); createHtmlByBase64(base64_png,htmlPath);} catch (FileNotFoundException e) { e.printStackTrace();}finally { try {if(inputStream != null){inputStream.close();} } catch (IOException e) {e.printStackTrace(); }} }
最终结果 转换后文件
转换后的文件内容
文件预览效果
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