Image Thumbnail 만들기

javax.media.jai API Docs

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;

import com.sun.media.jai.codec.FileSeekableStream;
import com.sun.media.jai.codec.ImageCodec;
import com.sun.media.jai.codec.SeekableStream;

public class TestThumb {
	public void createImageThumb(String loadfile, String savefile, int width, int height) throws IOException 	{

		if (getDecoderCheck(loadfile)) {
			File 	    save = new File(savefile);
			RenderedOp    op = JAI.create("fileload", loadfile);
	     	BufferedImage im = op.getAsBufferedImage();

	     	if(im.getWidth()  < width) width = im.getWidth();
	     	if(im.getHeight() < height) height = im.getHeight();

			BufferedImage thumb = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics2D 	  g2d   = thumb.createGraphics();

			g2d.drawImage(im, 0, 0, width, height, null);

			ImageIO.write(thumb, "png", save);
		}
	}
	protected boolean getDecoderCheck(String filename) {
		SeekableStream 	ss 	   = null;
		File 			file   = null;
		String[]		ext	   = null;
		String[]		images = {"gif","jpeg","png","tiff","bmp"};
		boolean 		check  = false;

		try {
			file = new File(filename);
			ss   = new FileSeekableStream(file);
			ext  = ImageCodec.getDecoderNames(ss);

			for(int i=0; i -1)
					{
						check = true;
						break;
					}
				}
			}
		}catch(Exception e) {}

		return check;
	}
}