About Steve Hanson
Last tutorial, I showed how to validate a form using annotations. This works great for simple validations, but eventually, you’ll need to validate some custom rules that aren’t available in the out-of-the-box annotations. For example, what if you need to validate that a user is over 21 years old, calculated based off their input birthdate, or, maybe you need to validate that the user’s phone area code is in Nebraska, USA. This tutorial with full source code will show how to create custom validation annotations that you can use along-side the JSR-303 and Hibernate Validator annotations we explored in the last tutorial.
You can grab the code for this tutorial on GitHub if you want to follow along.
For this example, let’s say we have a form with a phone number field and a birthdate field, and we want to validate the the phone number is valid (simple check for format) and that the user was born in 1989. There are no out-of-the-box annotations that support these (as far as I know), so we will write custom validation annotations which we can then re-use, just like the built-in JSR-303 ones.
When we are done, we will apply our annotations to our form object, like so:
Source : http://www.javacodegeeks.com/2013/07/spring-mvc-custom-validation-annotations.html
