Struts Validation Framework Example, please follow the Steps.

Step 1:

A simple validator-rules.xml File

<form-validation>
 <global>
  <validator
     name="required"
     classname="org.apache.struts.util.StrutsValidator"
     method="validateRequired"
     methodparams="java.lang.Object,
                   org.apache.commons.validator.ValidatorAction,
                   org.apache.commons.validator.Field,
                   org.apache.struts.action.ActionErrors,
                   javax.servlet.http.HttpServletRequest"
     msg="errors.required"/>
    
  <validator name="minlength"
     classname="org.apache.struts.util.StrutsValidator"
     method="validateMinLength"
     methodparams="java.lang.Object,
                   org.apache.commons.validator.ValidatorAction,
                   org.apache.commons.validator.Field,
                   org.apache.struts.action.ActionErrors,
                   javax.servlet.http.HttpServletRequest"
     depends="required"
     msg="errors.minlength"/>
 </global>
</form-validation>

Step 2: validation.xml

<form-validation>
 <formset>
  <form name="checkoutForm">
    <field
      property="firstName"
      depends="required">
      <arg0 key="label.firstName"/>
    </field>
        
    <field   
      property="lastName"
      depends="required">
      <arg0 key="label.lastName"/>
    </field>
  </form>
 </formset>
</form-validation>

Step 3: Add this ti Struts-Config.xml

<plug-in classname="org.apache.struts.validator.ValidatorPlugIn">
  <set-property
    property="pathnames"
    value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
</plug-in>

Step 4: If you want to use the Custom Validator , if you want to use this
,please use this validator name in "validator-rules.xml"

import java.io.Serializable;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.validator.Field;
import org.apache.commons.validator.GenericValidator;
import org.apache.commons.validator.ValidatorAction;
import org.apache.commons.validator.ValidatorUtil;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.util.StrutsValidatorUtil;

public class YourOwnValidator implements Serializable{

  public static boolean validateAge( Object bean,
    ValidatorAction va,
    Field field,
    ActionErrors errors, HttpServletRequest request) {

    String value = null;
    if (isString(bean)) {
      value = (String) bean;
    } else {
      value =
        ValidatorUtil.getValueAsString(bean, field.getProperty());
    }
 
  return true;
}

private static boolean isString(Object o) {
  if (o == null) {
    return (true);
  }
  return (String.class.isInstance(o));
 }
}

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