rails 插件 Negative Captcha 生成验证码简介

安装插件：

script/plugin install http://code.subwindow.com/negative_captcha

git submodule add git://github.com/subwindow/negative-captcha.git vendor/plugins/negative_captcha

controller回调

before_filter :setup_negative_captcha, :only => [:new, :create]

    private
      def setup_negative_captcha
        @captcha = NegativeCaptcha.new(
          :secret => NEGATIVE_CAPTCHA_SECRET, #A secret key entered in environment.rb.  'rake secret' will give you a good one.
          :spinner => request.remote_ip, 
          :fields => [:name, :email, :body], #Whatever fields are in your form 
          :params => params)
      end

最后要在页面添加

    <% form_tag comments_path do -%>
      <%= negative_captcha(@captcha) %>
        <ul class="contact_us">
          <li>
            <label>Name:</label>
            <%= negative_text_field_tag @captcha, :name %>
          </li>
          <li>
            <label>Email:</label>
            <%= negative_text_field_tag @captcha, :email %>
          </li>
          <li>
            <label>Your Comment:</label>
            <%= negative_text_area_tag @captcha, :body %>
          </li>
          <li>
            <%= submit_tag %>
          </li>
        </ul>
      <% end -%>

官网


另一个参考如下