How to include recapcha in html from java servlet?
Question
I want to include recapcha plugin in my web page from servlet. If i use <%@ ..%> or it won't include or show any recapcha.
Here is my servlet
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException {
final PrintWriter out=response.getWriter();
String s="";
String capchadisplay="<%@ ReCaptcha c = ReCaptchaFactory.newReCaptcha(\"public-key" +
"xxxxxxx \", \"private-key " +
"\", false);\nout.print(c.createRecaptchaHtml(null, null));\n%>";
String capchaimport="<%@ page language=\"java\" contentType=\"text/html; charset=utf-8\"\n" +
"pageEncoding=\"utf-8\" xmlns:jsp=\"http://java.sun.com/JSP/Page\"%>\n" +
"\n<%@ page import=\"net.tanesha.recaptcha.ReCaptcha\" %>\n" +
"<%@ page import=\"net.tanesha.recaptcha.ReCaptchaFactory\" %>";
String prefix="<!DOCTYPE html><html>\n<head>\n<title>Forms</title>\n</head>\n<body>\n";
String subfix="</body>\n</html>\n";
s=capchaimport.concat(prefix.concat(capchadisplay.concat(subfix)));
out.write(s);
out.flush();
out.close();
}
Here is what my html page should look like:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8" xmlns:jsp="http://java.sun.com/JSP/Page"%>
<%@ page import="net.tanesha.recaptcha.ReCaptcha" %>
<%@ page import="net.tanesha.recaptcha.ReCaptchaFactory" %>
<!DOCTYPE html>
<html>
<head>
<title>
Forms
</title>
</head>
<body>
<% ReCaptcha c = ReCaptchaFactory.newReCaptcha("pubic-key ", "private-key ", false);
out.print(c.createRecaptchaHtml(null, null));%>
</body>
</html>
Instead of a recapcha widget i get the string inside the
Now i don't know if is the right way to display recapcah, but i am open to any suggestions, i just want to display it from my servlet.
2 answers
solution1
1 2013-11-29 09:20:36
The reCAPTCHA Java Library provides a simple way to place a CAPTCHA on your Java-based website, helping you stop bots from abusing it. The library wraps the reCAPTCHA API.
Detailed step by step tutorial is provided here
solution2
0 ACCPTED 2013-11-29 14:03:48
After few hours of researching and lots of headeaks i have manage to come up whit a right answer. I just use this code in my capchadisplay string:
<script type="text/javascript"
</script>
<noscript>
<iframe src="http://www.google.com/recaptcha/api/noscript?k=your_public_key"
height="300" width="500" frameborder="0"></iframe><br>
<textarea name="recaptcha_challenge_field" rows="3" cols="40">
</textarea>
<input type="hidden" name="recaptcha_response_field"
value="manual_challenge">
</noscript>
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