How to validate a boolean in Struts 2 Validation Framework

问题

Simple: I have to be sure the privacy checkbox on my form is checked. I tryed to use the expression validator (and the fieldexpression validator) but it does'n work. Can anobody help me?

回答1:

Can you provide more information? How were you using the expression validator, and why didn't it work? Seems like that approach should work fine.

A few things to consider: do you have both a "getter" and a "setter" method for your boolean? Do you have both the "validation" and the "workflow" interceptors in your interceptor stack (the "defaultStack" does, for example).

回答2:

This worked for me:

<field name="agreeToPrivacy">
    <field-validator type="expression" >  
    <param name="expression">agreeToPrivacy == true</param>  
            <message>You must agree to the privacy agreement to continue.</message>  
    </field-validator>
</field>

来源：https://stackoverflow.com/questions/3663457/how-to-validate-a-boolean-in-struts-2-validation-framework