JSON parameter in spring MVC controller

Question

I have

@RequestMapping(method = RequestMethod.GET)
@ResponseBody
SessionInfo register(UserProfile profileJson){
  ...
}

I pass profileJson

Answer 1

You can create your own Converter and let Spring use it automatically where appropriate:

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;

@Component
class JsonToUserProfileConverter implements Converter {

    private final ObjectMapper jsonMapper = new ObjectMapper();

    public UserProfile convert(String source) {
        return jsonMapper.readValue(source, UserProfile.class);
    }
}

As you can see in the following controller method nothing special is needed:

@GetMapping
@ResponseBody
public SessionInfo register(@RequestParam UserProfile userProfile)  {
  ...
}

Spring picks up the converter automatically if you're using component scanning and annotate the converter class with @Component.

Learn more about Spring Converter and type conversions in Spring MVC.