java2d 特效：图像缩放

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