CODEWITHSUNDEEP
javaspring-mvc
mibutec
mibutec

Reputation: 2997

Spring MVC 3: Define own Datatype-Binding

in a spring3 Controller I can create an action-method with several Parameters witch will be set by spring

@RequestMapping(value="/updateTemplate")
public void doStuff(HttpServletRequest request, Locale locale) {
  assert request != null;
  assert locale != null;    
}

How can I teach Spring to fill my own defined Data-Types?

@RequestMapping(value="/updateTemplate")
public void doStuff(HttpServletRequest request, Locale locale, MyClass myClass) {
  assert myClass != null;
}

Upvotes: 3

Views: 344

Answers (2)

donnior
donnior

Reputation: 1065

you should use WebArgumentResolver

public class MyClassWebArgumentResolver implements WebArgumentResolver {
    public Object resolveArgument(MethodParameter param, NativeWebRequest req) throws Exception {
        if (param.getParameterType().equals(MyClass.class)) {
            MyCLass obj = new MyClass();
            ....
            return obj;
        }
        return UNRESOLVED;
    }

}

and register it to springmvc:

<mvc:annotation-driven >
    <mvc:argument-resolvers>
       <bean class="com.xxx.MyClassWebArgumentResolver" />
    </mvc:argument-resolvers>
</mvc:annotation-driven>

then you can use it in your controller

@RequestMapping(value="/updateTemplate")
public void doStuff(HttpServletRequest request, Locale locale, MyClass myClass) {
    assert myClass != null;
}

Upvotes: 2

nicholas.hauschild
nicholas.hauschild

Reputation: 42849

Spring has a class called HttpMessageConverter that will do just this for you. It will take various members of the incoming HttpServletRequest and use them to create an object that will then be passed to your Controller methods. The best part is that it will do this automatically for you if you have the HttpMessageConverter's added into the ApplicationContext (via the AnnotationMethodHandlerAdapter, described here).

There are many prebuilt implementations that exist already, and you can find a lot of them on the HttpMessageConverter page linked above. Probably the most often helpful are MappingJacksonHttpMessageConverter, which is used to map a JSONObject from the request body to a JavaBean, and MarshallingHttpMessageConverter, which is used to map XML from the request body to a JavaBean.

Upvotes: 0

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