java实现截取PDF指定页并进行图片格式转换功能

java实现截取PDF指定页并进行图片格式转换功能

1、引入依赖

org.apache.pdfbox

pdfbox

2.0.16

org.apache.pdfbox

fontbox

2.0.16

jar包下载地址：

https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox

https://mvnrepository.com/artifact/org.apache.pdfbox/fontbox

2、实现DEMO

package com.dddpeter.app;

import org.apache.pdfbox.multipdf.Splitter;

import org.apache.pdfbox.pdmodel.PDDocument;

import org.apache.pdfbox.rendering.PDFRenderer;

import javax.imageio.ImageIO;

import javax.imageio.stream.ImageOutputStream;

import java.awt.image.BufferedImage;

import java.io.*;

import java.util.List;

import java.util.ListIterator;

public class PDFUtils {

public static String splitPdf(int pageNum, String source, String dest) {

File indexFile = new File(source);

File outFile = new File(dest);

PDDocument document = null;

try {

document = PDDocument.load(indexFile);

// document.getNumberOfPages();

Splitter splitter = new Splitter();

splitter.setStartPage(pageNum);

splitter.setEndPage(pageNum);

List pages = splitter.split(document);

ListIterator iterator = pages.listIterator();

while (iterator.hasNext()) {

PDDocument pd = iterator.next();

if (outFile.exists()) {

outFile.delete();

}

pd.save(outFile);

pd.close();

if (outFile.exists()) {

return outFile.getPath();

}

}

document.close();

} catch (IOException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

public static void pdfFileToImage(File pdffile,String targetPath){

try {

FileInputStream instream = new FileInputStream(pdffile);

InputStream byteInputStream=null;

try {

PDDocument doc = PDDocument.load(instream);

PDFRenderer renderer = new PDFRenderer(doc);

int pageCount = doc.getNumberOfPages();

if (pageCount > 0) {

BufferedImage image = renderer.renderImage(0, 4.0f);

http:// image.flush();

ByteArrayOutputStream bs = new ByteArrayOutputStream();

ImageOutputStream imOut;

imOut = ImageIO.createImageOutputStream(bs);

ImageIO.write(image, "png", imOut);

byteInputStream = new ByteArrayInputStream(bs.toByteArray());

byteInputStream.close();

}

doc.close();

}

catch (IOException e) {

e.printStackTrace();

}

File uploadFile = new File(targetPath);

FileOutputStream fops;

fops = new FileOutputStream(uploadFile);

fops.write(readInputStream(byteInputStream));

fops.flush();

fops.close();

}

catch (Exception e) {

e.printStackTrace();

}

}

public static byte[] readInputStream(InputStream inStream) throws Exception {

ByteArrayOutputStream outStream = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while ((len = inStream.read(buffer)) != -1) {

outStream.write(buffer, 0, len);

}

inStream.close();

return outStream.toByteArray();

}

public static void main(String[] args) {

String path = splitPdf(4,"D:\\data\\11.pdf","D:\\data\\out11.pdf");

File file =new File(path);

//上传的是png格式的图片结尾

String targetfile="D:\\data\\out11.png";

pdfFileToImage(file,targetfile);

}

}

总结

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