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Suggested by [Jean-Christophe Gueriaud](https://vaadin.com/forum/#!/thread/16876180). Closes #10386
59 lines
1.5 KiB
Plaintext
59 lines
1.5 KiB
Plaintext
---
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title: Using Bean Validation To Validate Input
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order: 45
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layout: page
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---
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[[using-bean-validation-to-validate-input]]
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Using Bean Validation to validate input
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---------------------------------------
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Before you get started with Bean Validation you need to download a Bean
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Validation implementation and add it to your project. You can find one
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for instance at http://bval.apache.org/downloads.html. Just add the jars
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from the lib folder to your project.
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Bean Validation works as a normal validator. If you have a bean with
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Bean Validation annotations, such as:
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[source,java]
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....
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public class Person {
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@Size(min = 5, max = 50)
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private String name;
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@Min(0)
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@Max(100)
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private int age;
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// + constructor + setters + getters
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}
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....
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You can create a field for the name field as you always would:
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[source,java]
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....
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Person person = new Person("John", 26);
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TextField firstName = new TextField("First name");
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setContent(firstName);
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....
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and bind the field with a bean validation binder:
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[source,java]
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....
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BeanValidationBinder<Person> binder = new BeanValidationBinder<>(Person.class);
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binder.forField(firstName).bind("name");
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binder.setBean(person);
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....
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Your `firstName` field is now automatically validated based on the
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annotations in your bean class. You can do the same thing for the `age`
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field and you won't be able to set a value outside the valid 0-100
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range.
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A Bean Validation tutorial is available here:
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http://docs.oracle.com/javaee/6/tutorial/doc/gircz.html
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