Google reCAPTCHA: how to get user response and validate in the server side

Question

I am doing a Java (JSP + Servlet) web application (I understand that this question is technology-independent). I hope to use the latest Goolge reCAPTCHA service.

I a

Answer 1

Hi curious you can validate your google recaptcha at client side also 100% work for me to verify your google recaptcha just see below code
This code at the html body:

This code put at head section on call get_action(this) method form button:

function get_action(form) {

var v = grecaptcha.getResponse();
if(v.length == 0)
{
    document.getElementById('captcha').innerHTML="You can't leave Captcha Code empty";
    return false;
}
 if(v.length != 0)
 {
    document.getElementById('captcha').innerHTML="Captcha completed";
    return true; 
 }
}