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image.jspÓÃÓÚÉú³ÉÊý×ÖͼƬ
<%@ page contentType="image/jpeg;charset=gb2312" import="java.awt.*,
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%!
Color getRandColor(int fc,int bc){//¸ø¶¨·¶Î§»ñµÃËæ»úÑÕÉ«
          Random random = new Random();
          if(fc>255) fc=255;
          if(bc>255) bc=255;
          int r=fc+random.nextInt(bc-fc);
          int g=fc+random.nextInt(bc-fc);
          int b=fc+random.nextInt(bc-fc);
          return new Color(r,g,b);
          }
%>
<%
//ÉèÖÃÒ³Ãæ²»»º´æ
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
// ÔÚÄÚ´æÖд´½¨Í¼Ïó
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// »ñȡͼÐÎÉÏÏÂÎÄ
Graphics g = image.getGraphics();
//Éú³ÉËæ»úÀà
Random random = new Random();
// É趨±³¾°É«
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
//É趨×ÖÌå
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//»­±ß¿ò
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// Ëæ»ú²úÉú155Ìõ¸ÉÈÅÏߣ¬Ê¹Í¼ÏóÖеÄÈÏÖ¤Âë²»Ò×±»ÆäËü³ÌÐò̽²âµ½
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
          int xl = random.nextInt(12);
          int yl = random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}
// È¡Ëæ»ú²úÉúµÄÈÏÖ¤Âë(4λÊý×Ö)
String sRand="";
String rand="";
for (int i=0;i<4;i++){
    &