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The followings show a simple example using Struts' s Field Validators
Step 1
Create the jsp page
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{snippet:id=fieldValidatorsExample|lang=xml|javadoc=false|url=struts2/apps/showcase/src/main/webapp/WEB-INF/validation/fieldValidatorsExample.jsp}
Step 2
Create the actoin class
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action class{snippet:id=fieldValidatorsExample|javadoc=false|lang=java|url=struts2/apps/showcase/src/main/java/org/apache/struts2/showcase/validation/FieldValidatorsExampleAction.java}
Step 3
Create the validator.xml.
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{snippet:id=fieldValidatorsExample|javadoc=false|lang=xml|url=struts2/apps/showcase/src/main/
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resources/org/apache/struts2/showcase/validation/FieldValidatorsExampleAction-submitFieldValidatorsExamples-validation.xml}
