Step 1: Import jar files recaptcha4j-0.0.7.jar in lib folder
Step 2 : create index.jsp files.
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="net.tanesha.recaptcha.ReCaptcha" %>
<%@ page import="net.tanesha.recaptcha.ReCaptchaFactory" %>
<html>
<head>
<title>CAPTCHA in Java using reCAPTCHA</title>
</head>
<body>
<h2>CAPTCHA in Java Application using reCAPTCHA</h2>
<form action="./validate.jsp" method="post">
<p>Username: <input type="text" name="user"></p>
<p>Password: <input type="password" name="password"></p>
<p>
<%
ReCaptcha c = ReCaptchaFactory.newReCaptcha("6LdlHOsSAAAAAM8ypy8W2KXvgMtY2dFsiQT3HVq-", "6LdlHOsSAAAAACe2WYaGCjU2sc95EZqCI9wLcLXY", false);
out.print(c.createRecaptchaHtml(null, null));
%>
<input type="submit" value="submit" />
</p>
</form>
</body>
</html>
Step 3 : create validate.jsp files
<%@ page import="net.tanesha.recaptcha.ReCaptchaImpl"%>
<%@ page import="net.tanesha.recaptcha.ReCaptchaResponse"%>
<html>
<head>
<title>CAPTCHA in Java using reCAPTCHA</title>
</head>
<body>
<h2>CAPTCHA in Java Application using reCAPTCHA</h2>
<p>
<%
String remoteAddr = request.getRemoteAddr();
ReCaptchaImpl reCaptcha = new ReCaptchaImpl();
reCaptcha.setPrivateKey("6LdlHOsSAAAAACe2WYaGCjU2sc95EZqCI9wLcLXY");
String challenge = request
.getParameter("recaptcha_challenge_field");
String uresponse = request.getParameter("recaptcha_response_field");
ReCaptchaResponse reCaptchaResponse = reCaptcha.checkAnswer(
remoteAddr, challenge, uresponse);
if (reCaptchaResponse.isValid()) {
String user = request
.getParameter("user");
out.print("CAPTCHA Validation Success! User "+user+" registered.");
} else {
out.print("CAPTCHA Validation Failed! Try Again.");
}
%>
</p>
<a href=".">Home</a>
</body>
</html>
