Spring annotation for form validation for issue?

Question

Sorry for asking the simple question. I searched a lot , but can't find the exact solution.

In my spring bean class I have int field like (private int id) . I used @NotEmpty annotion.

I need to allow only numbers not any alphabets or string in the input field. What annotation I need to use.

I have tried the @NumberFormat(style = Style.NUMBER) , @Digits(fraction = 0, integer = 5) annotations and nothing working out.

Please suggest me the solution or any example for form validation...

Answer 1

I suggest you to read the relevant part of the reference carefully. You create your validator which implements the Validator interface:

public class FooValidator implements Validator {

/**
* This Validator validates *just* Foo instances
*/
public boolean supports(Class clazz) {
    return Foo.class.equals(clazz);
}

public void validate(Object obj, Errors e) {
    ValidationUtils.rejectIfEmpty(e, "name", "name.empty");
    Foo foo = (Foo) obj;
    if (!isNumeric(foo.getFieldThatShouldBeNumeric())
    {
        e.rejectValue("fieldThatShouldBeNumeric", "notnumeric");
    }
}
}

then inject it, either 'locally' to the controller itself:

@Controller
public class MyController {

@InitBinder
protected void initBinder(WebDataBinder binder) {
    binder.setValidator(new FooValidator());
}

@RequestMapping("/foo", method=RequestMethod.POST)
public void processFoo(@Valid Foo foo) { ... }

or 'globally':

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <mvc:annotation-driven validator="globalValidator"/>

</beans>