%@ page language="java" pageEncoding="UTF-8"%>
%@ page 
import="java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*" %>
%@ taglib http://struts.apache.org/tags-bean">http://struts.apache.org/tags-bean" 
prefix="bean" %>
%@ taglib http://struts.apache.org/tags-html">http://struts.apache.org/tags-html" 
prefix="html" %>
%@ taglib http://struts.apache.org/tags-logic">http://struts.apache.org/tags-logic" 
prefix="logic" %>
%@ taglib http://struts.apache.org/tags-tiles">http://struts.apache.org/tags-tiles" 
prefix="tiles" %>
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
html:html lang="true">
 head>
  html:base />
  title>MyJsp.jsp/title>
meta http-equiv="pragma" content="no-cache">
meta http-equiv="cache-control" content="no-cache">
meta http-equiv="expires" content="0">  
meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
meta http-equiv="description" content="This is my page">
!--
link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" >
-->
 /head>
 body>
h3>在jsp页面生成验证码/h3>
hr/>
%
 //out.clear();
 //response.setContentType("image/jpeg");//设置响应类型
 //response.addHeader("pragma","NO-cache");
 //response.addHeader("Cache-Control","no-cache");
 //response.addDateHeader("Expries",0);
 int width=400, height=30;//图片的大小（宽和高）
 //构架画布，第一个参数表示画布的宽，第二个参数表示画布的高，第三个参数的含义有待确定
 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
 Graphics g = image.getGraphics();//实例化画图对象
 //以下设置背景色
 g.setColor(Color.yellow); 
 Font DeFont=new Font("宋体", Font.ITALIC, 20);
 g.setFont(DeFont);
 //将已经设置好的背景颜色填充到指定的画布区域
 g.fillRect(0,0, width, height);
 //置字体色
 g.setColor(Color.blue);
 int x=10,y=10,xl=550,yl=15;
 g.drawLine(x,y,x+xl,y+yl); 
 //在画布中画椭圆形，参数为椭圆的坐标，用于确定椭圆的大小
 g.drawOval(0,10,200,10);
 //在画布上输出文字信息，第一个参数表示要显示的文字，第二和第三个参数表示起始点的X、Y坐标
 g.drawString("想要输出的文字－我是陈杉",70,20);
 g.dispose();
 ServletOutputStream outStream = response.getOutputStream();
 JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(outStream);
 encoder.encode(image);
 outStream.close();
%>
 /body>
/html:html>

img src="pic.jsp"/>