JSP 컬러 인증 코드 의 인 스 턴 스 코드

image.jsp

<%@ 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){//
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);
}
%>
<%
//
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
//
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//
Graphics g = image.getGraphics();
//
Random random = new Random();
//
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
//
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// 155 ,
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);
}
// (4 )
String sRand="";
for (int i=0;i<4;i++){
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
//
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));// , ,
g.drawString(rand,13*i+6,16);
}
// SESSION
session.setAttribute("rand",sRand);
//
g.dispose();
//
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
a.jsp------------------------------------------------------------------------------------------------------ 

<%@ 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> </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>

</td>
<td>
<img border=0 src="image.jsp">
</td>
</tr>
<tr>
<td align=left>

</td>
<td>
<input type=text name=rand maxlength=4 value="">
</td>
</tr>
<tr>
<td colspan=2 align=center>
<input type=submit value=" ">
</td>
</tr>
</table>
</form>
</body>
</html>
check.jsp----------------------------------------------------------------------------------------------------------------------

<%@ 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> </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");
%>

<%=rand%>
<br>

<%=input%>
<br>
<br>
<%
if (rand.equals(input)) {
%>
<font color=green> , !</font>
<%
} else {
%>
<font color=red> , !</font>
<%
}
%>
</body>
</html>

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