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java实现截取PDF指定页并进行图片格式转换功能

2019-09-05 11:19 363 查看

1、引入依赖

<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.16</version>
</dependency>
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>fontbox</artifactId>
<version>2.0.16</version>
</dependency>

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<PDDocument> pages = splitter.split(document);
ListIterator<PDDocument> 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);
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

以上所述是小编给大家介绍的java实现截取PDF指定页并进行图片格式转换功能,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
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