Struts Own Validator, Struts2 Validator, Validator, Struts2, example

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Writing own Validator using Struts2 Framework 
In order to create or build own Validator while using Struts2,
I have followed following steps to create a simple String
Upper case Validator for just to look for initial Capital
Letter in the String that is entered in the Name field.

Extending an existing example that has a index page and
a preview page.


this example may be one out of many ways one can define
Validators in Struts2 Framework.

Steps as follows:
1. create your own Validator class that extends
   com.opensymphony.xwork2.validator.validators.FieldValidatorSupport
2. implement validate (Object arg) method to add yours specific
   validation rule/logic.

   In this example: this method looks something like this:

   











   package sample;
   import com.opensymphony.xwork2.validator.validators.*;
   import com.opensymphony.xwork2.validator.ValidationException;

   public class TextCaseValidator extends FieldValidatorSupport
   {
       public TextCaseValidator() {
       }
       public void validate(Object obj) throws ValidationException
       {
           String fName = getFieldName();
           Object fValue = getFieldValue(fName, obj);
           if((fValue instanceof String) &&
                               (((String)fValue).length() >0)) {
             if(!(Character.isUpperCase(((String)fValue)
                           .substring(0,1).toCharArray()[0]))) {
                 addFieldError(fName, obj);
             }
           }
       }
   }



3. Define the validator.xml file and place this in WEB-INF\classes
   folder, the location where struts.xml file is already located.

   Content of this file is as follows:


   <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE validators PUBLIC
       "-//OpenSymphony Group//XWork Validator Config 1.0//EN"
       "http://www.opensymphony.com/xwork/xwork-validator-config-1.0.dtd">
   <validators>
       <validator name="sampleCaseValidator"
                   class="sample.TextCaseValidator"/>
   </validators>



4. Rest of the files should be as that of the earlier example,
   Struts2 Validation Example

After constructing this example, one can see following sequence of screen
images as fllows:


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