CODEWITHSUNDEEP
springspring-mvcparameters
Dachstein
Dachstein

Reputation: 4282

How to intercept controller methods in Spring MVC and fiddle with passed parameters?

How can I intercept controller methods in Spring MVC and fiddle around with the given parameters passed by the Spring framework?

Example

@PostMapping(consumes = "multipart/form-data")
public ResponseEntity<?> createPerson( CreatePersonCommand command ) {

   // ...
}

I want to be able to fiddle with the command object before my createPerson method is called. Lets say, because I want to set additional parameters (e.g. timestamp,...)

Update:

I am aware of the HandlerIntercaptor & Adapter. However, I still dont know how can I fiddle around with the CreatePersonCommand object in the preHandle Method.

@Override
public boolean preHandle(
    HttpServletRequest request, HttpServletResponse response, Object handler )
    throws Exception {

    // FIDDLE WITH CreatePersonCommand ???

    return true;
}

Upvotes: 1

Views: 2794

Answers (2)

cralfaro
cralfaro

Reputation: 5948

With Spring you could use aspects, and easy example for your case would be this:

@Aspect
@Component
public class PreHandlerAspect {
    
    @Before("execution(* com.your.controller..*Controller.*(..))")
    public void beforeController(JoinPoint joinPoint){
        //Here your code
        //You could access to the request, parameters, add the aspect for just 1 controller, many,...
    }
}

Upvotes: 2

NikNik
NikNik

Reputation: 2301

You can use Interceptors, method preHandle(): https://www.mkyong.com/spring-mvc/spring-mvc-handler-interceptors-example/

Update: I don't know how to do it exactly but you can try to use your handler object:

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler){
  ((HandlerMethod)handler).getMethodParameters()...
}

Let me know your final solution :)

Upvotes: 2

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