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- ---
- title: Using Bean Validation To Validate Input
- order: 45
- layout: page
- ---
-
- [[using-bean-validation-to-validate-input]]
- Using Bean Validation to validate input
- ---------------------------------------
-
- Before you get started with Bean Validation you need to download a Bean
- Validation implementation and add it to your project. You can find one
- for instance at http://bval.apache.org/downloads.html. Just add the jars
- from the lib folder to your project.
-
- Bean Validation works as a normal validator. If you have a bean with
- Bean Validation annotations, such as:
-
- [source,java]
- ....
- public class Person {
-
- @Size(min = 5, max = 50)
- private String name;
-
- @Min(0)
- @Max(100)
- private int age;
- // + constructor + setters + getters
- }
- ....
-
- You can create a field for the name field as you always would:
-
- [source,java]
- ....
- Person person = new Person("John", 26);
- TextField firstName = new TextField("First name");
-
- setContent(firstName);
- ....
-
- and bind the field with a bean validation binder:
-
- [source,java]
- ....
- BeanValidationBinder<Person> binder = new BeanValidationBinder<>(Person.class);
- binder.forField(firstName).bind("name");
- binder.setBean(person);
- ....
-
- Your `firstName` field is now automatically validated based on the
- annotations in your bean class. You can do the same thing for the `age`
- field and you won't be able to set a value outside the valid 0-100
- range.
-
- A Bean Validation tutorial is available here:
- http://docs.oracle.com/javaee/6/tutorial/doc/gircz.html
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