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JAVA实现PDF转HTML文档的示例代码

作者：孑木文学　　发布时间：2021-10-18 12:47:00　

标签：JAVA,PDF,HTML

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

<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 style=\"\r\n" + " text-align: center;\r\n" + " background-color: #C1C1C1;\r\n" + "\">");
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 style=\"position:fixed;bottom:10px;right:10px\" href=\"#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 \r\n
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:\\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

来源：https://blog.csdn.net/weixin_39699061/article/details/106845430

投稿

JAVA实现PDF转HTML文档的示例代码

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