unable to load captcha.jsp in my img tag for my registration form
https://stackoverflow.com/questions/12799646
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I am implementing captcha for my my registration form. When my page loads, i do not know why my captcha does not loads(shows).
I am showing my captch using img tag:-> <img src="captcha.jsp"/>.
But same captcha when i acceess it through facebox then it is appearing. I do know why it is happening like this.
Please help me if you can.
-Thanks
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"));
%>
Lösung
Turn your jsp into a servlet!
A jsp is a good choice to create markup files, which don't break if you add unnecessary whitespace inside your file.
Your captcha code works without any change inside a servlet's doGet(...) method.
package test.captcha;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class CaptchaServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
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();
HttpSession session = request.getSession();
session.setAttribute("dns_security_code", sImageCode);
//System.out.println("Captcha Page :"+session.getAttribute("dns_security_code"));
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
create if not exist a web application descriptor: /WEB-INF/web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>CaptchaServlet</servlet-name>
<servlet-class>test.captcha.CaptchaServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CaptchaServlet</servlet-name>
<url-pattern>/captcha-image.jpg</url-pattern>
</servlet-mapping>
</web-app>
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