效果图如下：

　　源代码：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Scale {
/**
　* @param args
　*/
public static void main(String[] args) {
　JFrame jf = new JFrame();
　jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
　jf.getContentPane().add(new ScalePanel());
　jf.setPreferredSize(new Dimension(500, 400));
　jf.pack();
　jf.setVisible(true);
}
}
class ScalePanel extends JPanel {
protected void paintComponent(Graphics g) {
　int width = this.getWidth();
　int height = this.getHeight();
　super.paintComponent(g);
　Graphics2D g2d = (Graphics2D) g;
　g2d.setColor(Color.WHITE);
　g2d.fillRect(0, 0, width, height);
　g2d.setColor(Color.BLACK);
　g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
　　RenderingHints.VALUE_FRACTIONALMETRICS_ON);
　g2d.setRenderingHint(RenderingHints.KEY_RENDERING,
　　RenderingHints.VALUE_RENDER_QUALITY);
　ImageIcon logoPNG;
　try {
　logoPNG = new ImageIcon(getClass().getResource("logo.png"));
　logoPNG.paintIcon(this, g2d, 10, 50);
　g2d.translate(width / 5, height / 2.5);
　g2d.scale(2.0, 2.0);//放大2倍
　logoPNG.paintIcon(this, g2d, 0, 0);
　g2d.scale(0.25, 0.25);//缩小到1/4
　logoPNG.paintIcon(this, g2d, 250, -180);
　} catch (Exception e) {
　e.printStackTrace();
　g2d.drawString("读入图像文件错误！", 100, 200);
　}
}
}

　　以上代码修改一下即可用在jsp中