JAVA怎样把一张图转换成指定大小

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

import javax.imageio.ImageIO;

public class Test {
public static void main(String[] args) throws IOException {
zoomImage("c:/2.jpg", "c:/222.jpg", 800, 600);
}
/**
* 改变图片尺寸
* @param srcFileName 源图片路径
* @param tagFileName 目的图片路径
* @param width 修改后的宽度
* @param height 修改后的高度
*/
public static void zoomImage(String srcFileName,String tagFileName,int width,int height){
try {
BufferedImage bi = ImageIO.read(new File(srcFileName));
BufferedImage tag=new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(bi, 0, 0, width, height, null);
ImageIO.write(tag, "jpg", new File(tagFileName));
} catch (IOException e) {
e.printStackTrace();
}
}
}