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Struts Tutorials: Struts2 Tag CheckBoxList
, Checkbox, Iterator, IF Struts2 Tag Library Example Struts2 Tiles Example Struts2 Tiles I18N Example Struts2 Questions Struts Tiles I18N Example Struts Eclipse MVC Struts2 Tags Struts2 Example and Tutorial Struts MVC Struts2 Validation
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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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If you have any questions/difficulty in running this example please do write to me by commenting on this page, using the below comment form.

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