How can I convert a PDF into a web-browsable image? - pdf

Question

I need to create an online viewer which converts PDF files into browsable images, like http://view.samurajdata.se/. I would like to do this in Grails. Does Grails have any plugins for this?

Answer 1

that's is possible by download PDFRenderer.jar fie and writing code is below
downloadedfile = request.getFile('sourceFile');
println "download file->"+downloadedfile
File destFile=new File('web-app/source-pdf/'+downloadedfile+'.pdf');
if(destFile.exists()){
destFile.delete();
}
File file = null;
try{
file = new File('web-app/source-pdf/'+downloadedfile+'.pdf');
downloadedfile.transferTo(file)
println "file->"+file
}catch(Exception e){
System.err.println("File Already Use")
//out.close();
}
File imageFile=new File("web-app/pdf-images");
if(imageFile.isDirectory())
{
String[] list=imageFile.list()
for(int i=0;i<list.length;i++){
File img=new File("web-app/pdf-images/"+i+".png")
img.delete()
}
}
//response.setContentType("image/png");
// response.setHeader("Cache-control", "no-cache");
RandomAccessFile raf;
BufferedImage[] img;
// response.setContentType("image/png");
// response.setHeader("Cache-control", "no-cache");
file=new File('web-app/source-pdf/'+downloadedfile+'.pdf');
try {
raf = new RandomAccessFile(file, "rws");
FileChannel channel = raf.getChannel();
ByteBuffer buf = channel.map(FileChannel.MapMode.READ_WRITE, 0, channel.size());
PDFFile pdffile = new PDFFile(buf);
// draw the first page to an image
int num=pdffile.getNumPages();
img=new BufferedImage[num]
for(int i=0;i<num;i++)
{
PDFPage page = pdffile.getPage(i);
//get the width and height for the doc at the default zoom
int width=(int)page.getBBox().getWidth();
int height=(int)page.getBBox().getHeight();
Rectangle rect = new Rectangle(0,0,width,height);
int rotation=page.getRotation();
Rectangle rect1=rect;
if(rotation==90 || rotation==270)
rect1=new Rectangle(0,0,(int)rect.height,(int)rect.width);
//generate the image
img[i] = (BufferedImage)page.getImage(
width,height , //width & height
rect1, // clip rect
null, // null for the ImageObserver
true, // fill background with white
true // block until drawing is done
);
ImageIO.write(img[i], "png",new File("web-app/pdf-images/"+i+".png"));
}
// out.close();
}
catch (FileNotFoundException e1) {
System.err.println(e1.getLocalizedMessage());
} catch (IOException e) {
System.err.println(e.getLocalizedMessage());
}
file = null;
render(view:'save',model:[images:img])