import java.awt.image.BufferedImage;
import java.io.File;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.imageio.ImageIO;
import java.awt.image.AffineTransformOp;
import java.awt.geom.AffineTransform;
import java.awt.Image;
public class ZoomPicture{
public static void main(String arg[]){
String filePath = "g:/图片.jpg"; // 图片的位置
int height=50;
int width=150;
Icon icon = null;
try{
icon = getFixedBoundIcon(filePath,height,width);
}catch(Exception e){
System.out.println("exception : " + e);
}
System.out.println(" ### " + icon); //生成新图片的位置；
}
public static Icon getFixedBoundIcon(String filePath, int height, int width)
throws Exception{
double Ratio=0.0;
//缩放比例
File F = new File(filePath);
if (!F.isFile()) throw new Exception
(F+" is not image file error in getFixedBoundIcon!");
Icon ret = new ImageIcon(filePath);
BufferedImage Bi = ImageIO.read(F);
if ((Bi.getHeight()>height) || (Bi.getWidth()>width)){
if (Bi.getHeight()>Bi.getWidth()){
Ratio = (new Integer(height)).doubleValue() /Bi.getHeight();
}
else {
Ratio = (new Integer(width)).doubleValue()/Bi.getWidth();
}
int lastLength = filePath.lastIndexOf(".");
String subFilePath = filePath.substring(0,lastLength);
String fileType = filePath.substring(lastLength);
File zoomFile = new File(subFilePath+"_"+height +"_"+width+fileType);
Image Itemp = Bi.getScaledInstance (width,height,Bi.SCALE_SMOOTH);
AffineTransformOp op = new AffineTransformOp
(AffineTransform.getScaleInstance(Ratio, Ratio), null);
Itemp = op.filter(Bi, null);
try {
ImageIO.write((BufferedImage)Itemp, "jpg", zoomFile);
ret = new ImageIcon(zoomFile.getPath());
}catch (Exception ex) {
System.out.println("######## here error : " + ex);
}
}
return ret;
}
} 
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