登録フォームにキャプチャを実装しています。ページが読み込まれるときに、キャプチャが読み込まれない (表示される) 理由がわかりません。
img tag:-> を使用してキャプチャを表示しています <img src="captcha.jsp"/>。しかし、フェイスボックスからアクセスすると同じキャプチャが表示されます。なぜこのようなことが起こっているのか、私は知っています。
できれば助けてください。
-ありがとう
index.jsp
<html:form action="/addUserAction?method=addUser" method="post" onsubmit="return validateAddUserForm(this);">
<html:javascript formName="addUserForm"></html:javascript>
<table border="0" width="100%" align="center" height="100%">
<tr>
<td align="center" bgcolor="#d0d67f" colspan="2" ><font size="5" face="Broadway" color="#4d4207">Registration Form</font> </td>
</tr>
<tr>
<td align="center" colspan="2"><div id="ashutosh" style="background:#ffebe8;border:0px solid #dd3c10;background-position: top"> </div> <div id="ansuman" > </div> </td>
</tr>
<tr>
<td align="right"><img alt="" src="images/validation/backRequiredGray.gif"><font size="3" face="Broadway" color="#4d4207">Name </font></td>
<td><html:text tabindex="3" style="height:27px;font-size:16pt;" property="name" maxlength="240"></html:text></td>
</tr>
<tr>
<td align="right"><img alt="" src="images/validation/backRequiredGray.gif"><font size="3" face="Broadway" color="#4d4207">Email </font></td>
<td>
<html:text tabindex="4" style="height:27px;font-size:16pt;" onkeyup="getEmailCheckResult(this.value);" property="email"></html:text>
</td>
</tr>
<tr>
<td align="right"><font size="3" face="Broadway" color="#4d4207">Phone Number </font></td>
<td><html:text tabindex="5" style="height:27px;font-size:16pt;" maxlength="15" onkeypress="return ValidateNum(this,event)" property="contactNumber"></html:text></td>
</tr>
<tr>
<td height="30" align="right" ><font size="3" face="Broadway" color="#4d4207">Code </font></td>
<td height="30" align="left"><img alt="" src="captcha.jsp" width="208"/></td>
</tr>
<tr>
<td height="30" align="right" valign=""><img src="images/validation/backRequiredGray.gif"><font size="3" face="Broadway" color="#4d4207">Enter Code </font></td>
<td height="30" align="left" >
<html:text tabindex="7" property="code" style="height:27px;font-size:16pt;" onkeyup="getCapchaCheckResult(this.value);" size="16" maxlength="13"></html:text>
<div id="ansuman"> </div>
</td>
</tr>
<tr>
<td height="30" align="center" valign="middle" colspan="2"><img alt="" ><font color="#4d4207">By clicking Sign Up, you agree and understand our</font> <a href="tc.do" target="blank"><font color="#4d4207">Terms & Conditions.</font></a> </td>
</tr>
<tr>
<td height="30" align="right" valign="middle" colspan="2"><img src="images/validation/backRequiredGray.gif"> Fields Required</td>
</tr>
<tr>
<td colspan="2" align="center" ><input type="submit" style="height:37px;font-size:16pt;color:#4d4207;" value="Sign Up"></td>
</tr>
<tr>
<td height="30" align="center" valign="middle" colspan="2" bgcolor="#d0d67f"><font color="#4d4207">Please Note: The Password will be emailed to the mail Id provided.</font> </td>
</tr>
</table>
</html:form>
captcha.jsp
<%--
Document : captcha
Created on : 23 Jan, 2012, 2:23:50 PM
Author : Ashutosh
--%>
<%@ page import="java.util.*, java.io.*,java.awt.*,java.awt.image.*,javax.imageio.*,java.awt.geom.*"%>
<%
response.setContentType("image/jpg");
/* Define number characters contains the captcha image, declare global */
int iTotalChars= 6;
/* Size image iHeight and iWidth, declare globl */
int iHeight=40;
int iWidth=150;
/* font style */
Font fntStyle1 = new Font("Arial", Font.BOLD, 30);
Font fntStyle2 = new Font("Verdana", Font.BOLD, 20);
/* Possible random characters in the image */
Random randChars = new Random();
String sImageCode = (Long.toString(Math.abs(randChars.nextLong()), 36)).substring(0,iTotalChars);
/* BufferedImage is used to create a create new image*/
/* TYPE_INT_RGB - does not support transpatency, TYPE_INT_ARGB - support transpatency*/
BufferedImage biImage = new BufferedImage(iWidth, iHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g2dImage = (Graphics2D) biImage.getGraphics();
// Draw background rectangle and noisey filled round rectangles
int iCircle = 15;
//g2dImage.fillRect(0, 0, iWidth, iHeight);
for ( int i = 0; i < iCircle; i++ )
{
g2dImage.setColor(new Color(randChars.nextInt(255),randChars.nextInt(255),randChars.nextInt(255)));
int iRadius = (int) (Math.random() * iHeight / 2.0);
int iX = (int) (Math.random() * iWidth - iRadius);
int iY = (int) (Math.random() * iHeight - iRadius);
//g2dImage.fillRoundRect(iX, iY, iRadius * 2, iRadius * 2,100,100);
}
g2dImage.setFont(fntStyle1);
for ( int i = 0; i < iTotalChars; i++ )
{
g2dImage.setColor(new Color(randChars.nextInt(255),randChars.nextInt(255),randChars.nextInt(255)));
if (i%2==0)
g2dImage.drawString(sImageCode.substring(i,i+1),25*i,24);
else
g2dImage.drawString(sImageCode.substring(i,i+1),25*i,35);
}
/* create jpeg image and display on the screen*/
OutputStream osImage = response.getOutputStream();
ImageIO.write(biImage, "jpeg", osImage);
//osImage.close();
/* Dispose function is used destory an image object */
g2dImage.dispose();
session.setAttribute("dns_security_code", sImageCode);
//System.out.println("Captcha Page :"+session.getAttribute("dns_security_code"));
%>