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 /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("
");
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", "")
.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
到此这篇关于JAVA实现PDF转HTML文档的示例代码的文章就介绍到这了,更多相关JAVA PDF转HTML 内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！
