Perche risolvere 2 volte lo stesso problema?
Codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<%@ page
language="java"
contentType="text/html; charset=ISO-8859-1"
%>
<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<META name="GENERATOR" content="IBM WebSphere Studio">
<TITLE></TITLE>
</HEAD>
<BODY>
<br><br><br><br>
<%
String c= (String)session.getAttribute(nl.captcha.servlet.Constants.SIMPLE_CAPCHA_SESSION_KEY) ;
String parm = (String) request.getParameter("captchafield");
out.println(parm + " ? " + c + ":");
if (c != null && parm != null) {
if (c.equals(parm)) {
out.println("<b>true</b>");
}else {
out.println("<b>false</b>");
}
}
%>
<table>
<tr>
<td><img src="Captcha.jpg">
</td>
<td valign="top">
<form>
<br><input type="text" name="captchafield"><br>
<INPUT type="submit" name="submit">
</form>
</td>
</tr>
</table>
</BODY>
</HTML>
e questo è il web.xml
Codice:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app id="WebApp">
<display-name>captcha</display-name>
<servlet>
<servlet-name>SimpleCaptcha</servlet-name>
<display-name>SimpleCaptcha</display-name>
<servlet-class>nl.captcha.servlet.SimpleCaptcha</servlet-class>
</servlet>
<servlet-name>Captcha</servlet-name>
<display-name>Captcha</display-name>
<servlet-class>nl.captcha.servlet.CaptchaServlet</servlet-class>
<servlet>
<servlet-name>Captcha</servlet-name>
<display-name>Captcha</display-name>
<servlet-class>nl.captcha.servlet.CaptchaServlet</servlet-class>
<!--border around captcha. Legal values are yes or no. Defaults to yes Other values will be ignored-->
<init-param>
<param-name>cap.border</param-name>
<param-value>yes</param-value>
</init-param>
<!--color of the border. Legal values are r,g,b(and optional alpaha) or white,black,etc. Other values will be ignored-->
<init-param>
<param-name>cap.border.c</param-name>
<param-value>black</param-value>
</init-param>
<!--thickness of the border around captcha. Legal values are > 0 other values will be ignored. Defaults to one-->
<init-param>
<param-name>cap.border.th</param-name>
<param-value>1</param-value>
</init-param>
<init-param>
<param-name>cap.obscurificator</param-name>
<!--<param-value>nl.captcha.obscurity.imp.ShadowGimpyImp</param-value>-->
<!--<param-value>nl.captcha.obscurity.imp.WaterRiple</param-value>-->
<param-value>nl.captcha.sandbox.TestGimpyImp</param-value>
</init-param>
<init-param>
<param-name>cap.cap.producer</param-name>
<param-value>nl.captcha.obscurity.DefaultCaptchaIml</param-value>
</init-param>
<init-param>
<param-name>cap.word.imp</param-name>
<param-value>nl.captcha.text.imp.DefaultWordRenderer</param-value>
</init-param>
<init-param>
<param-name>cap.text.producer</param-name>
<!--<param-value>nl.captcha.sandbox.ChineseTextProducer</param-value>-->
<param-value>nl.captcha.text.imp.FiveLetterFirstNameTextCreator</param-value>
</init-param>
<init-param>
<param-name>cap.char.arr</param-name>
<param-value>2,3,4,6,7,8,a,b,c,d,e,f,g,h,k,o,r,s,t,x,y</param-value>
</init-param>
<!--if default captcha producer is slelected this value represents the amount of chars that are supplied in the captcha. values below 2 are not exepted when omitted defaults to 5-->
<init-param>
<param-name>cap.char.arr.l</param-name>
<param-value>6</param-value>
</init-param>
<init-param>
<param-name>cap.font.arr</param-name>
<param-value>Arial,Helvetica,Courier,TimesRoman</param-value>
</init-param>
<init-param>
<param-name>cap.font.size</param-name>
<param-value>40</param-value>
</init-param>
<init-param>
<param-name>cap.font.color</param-name>
<param-value>166,31,255</param-value>
</init-param>
<init-param>
<param-name>cap.bg.imp</param-name>
<param-value>nl.captcha.obscurity.imp.DefaultBackgroundImp</param-value>
</init-param>
<!--values can be either red,yellow,blue,cya etc or r,g,b,alpha value-->
<init-param>
<param-name>cap.background.c.to</param-name>
<param-value>255,255,255</param-value>
</init-param>
<init-param>
<param-name>cap.background.c.from</param-name>
<param-value>75,75,255</param-value>
</init-param>
<init-param>
<param-name>cap.noise.imp</param-name>
<param-value>nl.captcha.obscurity.imp.DefaultNoiseImp</param-value>
</init-param>
<init-param>
<param-name>cap.noise.c</param-name>
<param-value>166,31,255</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>SimpleCaptcha</servlet-name>
<url-pattern>/SimpleCaptcha.jpg</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Captcha</servlet-name>
<url-pattern>/Captcha.jpg</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>