THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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This tutorial assumes you've completed the Processing Forms tutorial and have a working form_processing project. The example code for this tutorial, form_validation, is available for checkout from the Struts 2 sandbox subversion GitHub repository: https://svngithub.apache.org/repos/asf/struts/sandbox/trunk/struts2examplescom/apache/struts-examples. |
Introduction
In this tutorial we'll explore using Struts 2 to validate the user's input on a form. There are two ways you can use Struts 2 to do form validation. This tutorial will cover the more basic method, where the validation is included in the Struts 2 Action class.
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public void validate(){
if ( personBean.getFirstName().length() == 0 ){
addFieldError( "personBean.firstName", "First name is required." );
}
if ( personBean.getEmail().length() == 0 ){
addFieldError( "personBean.email", "Email is required." );
}
if ( personBean.getAge() < 18 ){
addFieldError( "personBean.age", "Age is required and must be 18 or older" );
}
}
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To handle the return value of "input" we need to add the following result to our action node in struts.xml.
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<result name="input">/register.jsp</result>
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So the following addFieldError method call:
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addFieldError( "personBean.firstName", "First name is required.")
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