To generate a "Login verification Code" method step

1. Add the Simplecaptcha rack package simple enough verification code production library. 2. New Captchamodule Module Class

public class captchamodule {         @At       @Ok ("Raw:png")         public bufferedimage next ( httpsession session,  @Param ("W")  int w, @Param ("H")  int h)  {             if  (w * h < 1)  {  //long or wide to 0? reset to default length width .            w =  200;            h = 60;         }        captcha captcha  = new captcha.builder (w, h)                                   .addtext ().Addbackground (New gradiatedbackgroundproducer ())                                   .gimp (New fisheyegimpyrenderer ())                                   .build ();         string  text = captcha.getanswer ();         Session.setattribute (toolkit.captcha_attr, text);         return  captcha.getimage ();     }}

• Raw represents Rawview

• PNG is the abbreviation for image/png in Rawview and is the description of data mime

• The return value is BufferedImage, and this is image/png, so it turns into a picture display. Also support JPG/WEBP format, details refer to Rawview source bar.

• CAPTCHA has more than n combination and configuration, the choice of their own

3. Add the Captcha text box to the page

<script type= "Text/javascript" >             function next_captcha ()  {                 $ ("#captcha_img"). attr ("src",  "${base}/captcha/next?_="  + new  date (). GetTime ());             }         </script>         Verification Code <input name= "Captcha"  type= "text"  value= "" >         </IMG> 

650) this.width=650; "src=" Http://img.baidu.com/hi/jx2/j_0003.gif "alt=" J_0003.gif "/>650" this.width=650; "src=" Http://img.baidu.com/hi/jx2/j_0005.gif "alt=" J_0005.gif "/>

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To generate a "Login verification Code" method step