JAVA实现PDF转HTML文档的示例代码

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

org.apache.pdfbox

pdfbox

2.0.12

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, DImRC240);//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();

}http://

}

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("

stringHtml.append("");

stringHtml.append("

stringHtml.append("");

stringHtml.append(

"

stringHtml.append("");

stringHtml.append("");

//添加锚点用于返回首页

stringHtml.append("回到首页");

stringHtml.append("");

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 \r\n

png_base64 = encoder.encodeBuffer(bytes).trim()

.replaceAll("\n", "")

.replaceAllDImRC("\r", "");

} catch (IOException e) {

e.printStackTrace();

}

return png_base64;

}

}

测试Demo

public static void main(String[] args) {

File file = new File("F:\\111\\Files\\mysql查询语句大全集锦(经典珍藏).pdf");

String htmlPath = "F:\\111\\Files\\MySQL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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