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 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
