用JAVA将大图片文件转换出小的缩略图文件

用Java将大图片文件转换出小的缩略图文件,要求使用JDK1.4,

大家可以将这段程序代码改为JavaBean,以便在WEB环境中使用,

转换出的小缩略图效果不错!

import javax.imageio.ImageIO;

import javax.imageio.IIOException;

import java.awt.image.BufferedImage;

import java.awt.Image;

import java.io.File;

import java.awt.image.AffineTransformOp;

import java.awt.geom.AffineTransform;

public class imgTest {

public static void main (String argv[]) {

try {

File fi = new File("c:/image2.jpg"); //大图文件

File fo = new File("c:/imgTest.jpg"); //将要转换出的小图文件

int nw = 100;

AffineTransform transform = new AffineTransform();

BufferedImage bis = ImageIO.read(fi);

int w = bis.getWidth();

int h = bis.getHeight();

double scale = (double)w/h;

int nh = (nw*h)/w ;

double sx = (double)nw/w;

double sy = (double)nh/h;

transform.setToScale(sx,sy);

System.out.println(w + " " +h);

AffineTransformOp ato = new AffineTransformOp(transform,null);

BufferedImage bid = new BufferedImage(nw,nh,BufferedImage.TYPE_3BYTE_BGR);

ato.filter(bis,bid);

ImageIO.write(bid,"jpeg",fo);

} catch(Exception e) {

e.printStackTrace();

}

}

}