Developing custom build Kaptcha (captcha) in adf

Web applications might often need captcha in order to prevent application from robotic attacks. Following example demonstrates how to build custom captcha in ADF Technology

Display Captcha :

Add following in jspx:

 <af:panelGroupLayout id="pgld11" layout="horizontal">
                  <af:outputLabel value="#{pageFlowScope.backingBean.secretQ}" id="otd14"
                                  inlineStyle="font-weight:normal; font-size:small; color:Black; font-family:Arial;"/>
                  <af:spacer width="18" height="5" id="sd13"/>
                  <af:inputText simple="true" label="secretQ" id="it7capta" contentStyle="width:100px; height:22px; font-family:Arial; font-size:small; color:Black; border-color:#878787;"
                                value="#{pageFlowScope.backingBean.secretUA}"
                                autoSubmit="true"
                                binding="#{pageFlowScope.backingBean.secreatAnswer_binding}">
                     </af:inputText>
            </af:panelGroupLayout>

in backing bean define the variables as:

 private String secretQ, secretA, secretUA;

 public void setSecretQ(String secretQ) {
        this.secretQ = secretQ;
    }

    public String getSecretQ() {
        List<String> secretQandA = CAPTCHAUtil.getQuestionAndAnswer();
        this.setSecretQ(secretQandA.get(0));
        this.setSecretA(secretQandA.get(1));
        this.setSecretUA("");
        return secretQ;
    }

    public void setSecretA(String secretA) {
        this.secretA = secretA;
    }

    public String getSecretA() {
        return secretA;
    }

    public void setSecretUA(String secretUA) {
        this.secretUA = secretUA;
    }

    public String getSecretUA() {
        return secretUA;
    }


please find the captcha util class attached. it can be modified as per user needs.


Validate Captcha:

Call this method to validate captcha:

    private Boolean validateCapta() {
        if(getSecretUA()== null){
            retValue=false;
        }else{
            if(getSecretUA().equals("")){
                retValue=false;
            }else if(!getSecretA().equalsIgnoreCase(getSecretUA())){
                retValue=false;
            }
             
        }
     
        return retValue;
    }