Spring: parse url to get filter

Question

There is a way using Spring having some code like this:

@RequestMapping("/animals/view/*")
public ModelAndView view(@SomeKindOfAnnotation AnimalFilter filter) {
    return new ModelAndView("myViewPage", "animals", animalService.filterBy(filter));
}

I want call urls like these:

<myContextPath>/animals/view/ (extracts all animals)
<myContextPath>/animals/view/type/cat (extracts only cats)
<myContextPath>/animals/view/type/cat/color/yellow (extracts only brown cats)
<myContextPath>/animals/view/type/insect/legs/6 (extracts only insects with 6 legs)

and having the object animalFilter already filled with the data contained into the url.

AnimalFilter is a simple POJO class with getter and setter for every type of fields that the user can use for filter animals.

If there isn't a way doing this is possible to create the new annotation @SomeKindOfAnnotation for filling the AnimalFilter automatically?

Tiarê Balbi · Accepted Answer · 2014-04-11 17:09:36Z

1

What you can do is build a PropertyEditor or you can use a object mapper like Jackson if you are using json value, but if you really want to use a annotation you can use AOP:

Examples using AOP:

@Before(value="@annotation(audit) && args(.......)")
public void beforeHandler(SomeKindOfAnnotation audit, .......) {

Example using PropertiesEditor:

public class SomeKindOfPropertie extends PropertiesEditor {

@Override
public void setAsText(String text) throws IllegalArgumentException {
    // Reminding all parameters in the request are String.
            .......
            setValue(new SomeKind(text));
} 

}

In your controller you need to register the propertiesEditor on the binder:

@InitBinder("filter")
public void initBinder(WebDataBinder binder) {
    binder.registerCustomEditor(SomeKind.class, new SomeKindOfPropertie());
}

More Information: http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/validation.html

edited Apr 11, 2014 at 17:09

answered Apr 11, 2014 at 16:54

Tiarê Balbi

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2 Comments

Michele Over a year ago

With the PropertiesEditor can I parse the url to fill my class AnimalFilter?

Tiarê Balbi Over a year ago

Yes, you can do what you want, you will receive a String parameter with the value of the request.

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