PDF转换成图片
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2022-04-09 08:59:07
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需求:公司现在有个将PDF文件转换成.tif格式的图片,然后利用FTP上传到服务器。
所需jar:PDFRenderer-0.9.1.jar
下面代码是将PDF文件转换成.tif格式
package com.xu.test;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;
public class PDFchangToImage {
public static void main(String[] args) {
PDFchangToImage.changePdfToImg();
}
public static void changePdfToImg() {
try {
File file = new File("D:\\LT000091209.pdf");
RandomAccessFile raf = new RandomAccessFile(file, "r");
FileChannel channel = raf.getChannel();
MappedByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY,0, channel.size());
PDFFile pdffile = new PDFFile(buf); //加载pdf文件
for (int i = 1; i <= pdffile.getNumPages(); i++) {
PDFPage page = pdffile.getPage(i); //获取PDF第几页
Rectangle rect = new Rectangle(70, -20, ((int) 320),((int) page.getBBox().getHeight()));
int w = 3; //设置图片的宽放大多少倍
int h = 3; //设置图片的高放大多少倍
Image img = page.getImage(rect.width * w, rect.height * h,
rect,
null, // null for the ImageObserver
true, // fill background with white
true // block until drawing is done
);
BufferedImage tag = new BufferedImage(rect.width * w,rect.height * h, BufferedImage.TYPE_BYTE_GRAY);
tag.getGraphics().drawImage(img, 0, 0, rect.width * w,rect.height * h, null);
FileOutputStream out = new FileOutputStream("D:\\" + i+ ".tif"); // 输出到文件流
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(tag);
param.setQuality(1f, false);// 1f是提高生成的图片质量 0-1之间
encoder.setJPEGEncodeParam(param);
encoder.encode(tag); // JPEG编码
out.flush();
out.close();
}
channel.close();
raf.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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