利用JSP直接绘制图片并输出到IE里

以下代码经测试成功, 直接复制到JSP中即可以运行

<%@ page import="java.awt.*" %>
<%@ page import="java.awt.image.*" %>
<%@ page import="com.sun.image.codec.jpeg.*" %>
<%@ page import="java.util.*" %>

<%
  //test by liboy

  int width=400;
  int height= 400;

  BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  
  Graphics g = image.getGraphics();
  //Graphics2d g2d = image.createGraphics();

  g.setColor(Color.white);
  g.fillRect(0, 0, width, height);
  g.setColor(Color.black);
  g.drawRect(0,0,width-1,height-1);
  // Create random polygon
  Polygon poly = new Polygon();
  Random random = new Random();
  for (int i=0; i<5; i++) {
  poly.addPoint(random.nextInt(width), random.nextInt(height));
  }
  // Fill polygon
  g.setColor(Color.cyan);
  g.fillPolygon(poly);
  // Dispose context
  g.dispose();

        response.reset();
        response.setContentType("image/jpeg");

  ServletOutputStream sos = response.getOutputStream();
  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
  encoder.encode(image);

%>

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