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code.jsp:
<%@ page language="java" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"
contentType="image/jpeg" pageEncoding="UTF-8"%>
<% //ÉèÖÃÒ³Ãæ²»»º´æ
response.setHeader("Pragma","No-cache");
response.setHeader("Cahce-Control","no-cache");
response.setDateHeader("Expires",0);
//ÔÚÄÚ´æÖд´½¨Í¼Æ¬
int width=58;
int height=20;
BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//»ñȡͼÐÎÉÏÏÂÎÄ
Graphics g= image.getGraphics();
//Éú³ÉËæ»úÀà
Random random= new Random();
//ÉèÖñ³¾°ÑÕÉ«
g.setColor(new Color(150,200,100));
g.fillRect(0,0,width,height);
//ÉèÖÃ×ÖÌå
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//Ëæ»ú²úÉú50Ìõ¸ÉÈÅÏߣ¬Ê¹Í¼ÐÎÖеÄÑéÖ¤Âë²»Ò×±»ÆäËûµÄ³ÌÐò̽²âµ½
g.setColor(new Color(150,200,100));
for(int i=0;i<50;i++)
{
int x=random.nextInt(width);
int y=random.nextInt(height);
int x1=random.nextInt(width);
int y1=random.nextInt(height);
g.drawLine(x,y,x+x1,y+y1);
}
//Ëæ»ú²úÉúÑéÖ¤Â루6λÊý×Ö£©
String sRand="";
for(int i=0;i<4;i++)
{
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
//½«ÑéÖ¤ÂëÏÔʾµ½Í¼Ïó
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
g.drawString(rand,13*i+6,16);
}
session.setAttribute("rand",sRand); //////½«²úÉúµÄÑéÖ¤Âë´æ´¢µ½sessonÖÐ
g.dispose();
ImageIO.write(image,"JPEG",response.getOutputStream());
out.clear();
out=pageContext.pushBody();
%>

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>