之前领导提出来一个需求说是将pdf转换成图片，所以找了一个包PDFBOX，下载最新包网上找的都是老的版本，新的包方法不太适应，找到源码demo看了一下记录下来以便以后再用。
package com.learn.pdf;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
public class PdfChangeImg {
public static void main(String[] args) {
//将pdf装图片 并且自定义图片得格式大小
File file = new File("E:\\qiyuesuoTraining\\com.pdf");
try {
PDDocument doc = PDDocument.load(file);
PDFRenderer renderer = new PDFRenderer(doc);
int pageCount = doc.getNumberOfPages();
for(int i=0;i<pageCount;i++){
BufferedImage image = renderer.renderImageWithDPI(i, 96); // Windows native DPI
BufferedImage srcImage = resize(image, 240, 240);//产生缩略图
ImageIO.write(srcImage, "PNG", new File("E:\\qiyuesuoTraining\\com.png"));
}
} catch (IOException e) {
e.printStackTrace();
}
}
private static BufferedImage resize(BufferedImage source, int targetW, int targetH) {
int type=source.getType();
BufferedImage target=null;
double sx=(double)targetW/source.getWidth();
double sy=(double)targetH/source.getHeight();
if(sx>sy){
sx=sy;
targetW=(int)(sx*source.getWidth());
}else{
sy=sx;
targetH=(int)(sy*source.getHeight());
}
if(type==BufferedImage.TYPE_CUSTOM){
ColorModel cm=source.getColorModel();
WritableRaster raster=cm.createCompatibleWritableRaster(targetW, targetH);
boolean alphaPremultiplied=cm.isAlphaPremultiplied();
target=new BufferedImage(cm,raster,alphaPremultiplied,null);
}else{
target=new BufferedImage(targetW, targetH,type);
}
Graphics2D g=target.createGraphics();
g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
g.dispose();
return target;
}
}
其中缩略图使用得方法参照了/hehe9737/article/details/7656308得来。
