%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
%!
Color getRandColor(int fc,int bc){//給定范圍獲得隨機顏色
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);
}
%>
%
//設置頁面不緩存
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
// 在內存中創建圖象
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 獲取圖形上下文
Graphics g = image.getGraphics();
//生成隨機類
Random random = new Random();
// 設定背景色
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
//設定字體
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//畫邊框
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// 隨機產生155條干擾線，使圖象中的認證碼不易被其它程序探測到
g.setColor(getRandColor(160,200));
for (int i=0;i155;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);
}
// 取隨機產生的認證碼(4位數字)
String sRand="";
for (int i=0;i4;i++){
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
// 將認證碼顯示到圖象中
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//調用函數出來的顏色相同，可能是因為種子太接近，所以只能直接生成
g.drawString(rand,13*i+6,16);
}
// 將認證碼存入SESSION
session.setAttribute("rand",sRand);
// 圖象生效
g.dispose();
// 輸出圖象到頁面
ImageIO.write(image, "JPEG", response.getOutputStream());
%>

%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
html>
head>
title>認證碼輸入頁面/title>
meta http-equiv="Content-Type" content="text/html; charset=gb2312">
META HTTP-EQUIV="Pragma" CONTENT="no-cache">
META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
META HTTP-EQUIV="Expires" CONTENT="0">
/head>
body>
form method=post action="check.jsp">
table>
tr>
td align=left>
系統產生的認證碼：
/td>
td>
img border=0 src="image.jsp">
/td>
/tr>
tr>
td align=left>
輸入上面的認證碼：
/td>
td>
input type=text name=rand maxlength=4 value="">
/td>
/tr>
tr>
td colspan=2 align=center>
input type=submit value="提交檢測">
/td>
/tr>
/table>
/form>
/body>
/html>

%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
%@ page contentType="text/html; charset=gb2312" language="java"
import="java.sql.*" errorPage=""%>
html>
head>
title>認證碼驗證頁面/title>
meta http-equiv="Content-Type" content="text/html; charset=gb2312">
META HTTP-EQUIV="Pragma" CONTENT="no-cache">
META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
META HTTP-EQUIV="Expires" CONTENT="0">
/head>
body>
%
String rand = (String) session.getAttribute("rand");
String input = request.getParameter("rand");
%>
系統產生的認證碼為：
%=rand%>
br>
您輸入的認證碼為：
%=input%>
br>
br>
%
if (rand.equals(input)) {
%>
font color=green>輸入相同，認證成功！/font>
%
} else {
%>
font color=red>輸入不同，認證失敗！/font>
%
}
%>
/body>
/html>