Avoid duplicate code in Controllers and service - spring

Question

I am using Spring framework.
I wrote some pretty long code to save some results.
So later it turned out in other controllers I will also need this code. Just with small differences for example returning some other strings.
So of course every controller will have its own mapping. So the parameters will be duplicate anyway.
But now for the code inside the mapping method.
I was thinking putting the code in the service of the original controller. Then the other controllers will call this service. The service of course will have plenty of parameters + the slight differences between the controllers. Or should I make like a general service, have good documentation there because of course the methods there will be general and later I should know what they were for.
#PostMapping("/testcase") public RedirectView saveResult(Model model, #ModelAttribute("testResultEntity") TestResultEntity testResultEntity, RedirectAttributes redirectAttributes , #RequestParam(required = false) String version , #RequestParam(required = false,defaultValue = "0") String page, #RequestParam(required = false) String operation, Authentication authentication,Locale locale)
{ // here comes long code, which will be used also in other controllers ;
}

Answer 1

If all the controller mappings have the same signature you can create a parent class with the common implementation.
Something like this:
public abstract class BaseAbstractController {
// specific logic per controller
abstract String specific();
public RedirectView save(Model model, #ModelAttribute("testResultEntity") TestResultEntity testResultEntity,
RedirectAttributes redirectAttributes, #RequestParam(required = false) String version,
#RequestParam(required = false, defaultValue = "0") String page, #RequestParam(required = false) String operation,
Authentication authentication, Locale locale) {
// here comes long code, which will be used also in other controllers ;
String specific = specific();
}
}
#Controller
public class TestController extends BaseAbstractController {
#Override
String specific() {
return "something"; // here goes your specific logic;
}
#PostMapping("/testcase")
public RedirectView saveResult(Model model, #ModelAttribute("testResultEntity") TestResultEntity testResultEntity,
RedirectAttributes redirectAttributes, #RequestParam(required = false) String version,
#RequestParam(required = false, defaultValue = "0") String page, #RequestParam(required = false) String operation,
Authentication authentication, Locale locale) {
return save(model, testResultEntity, redirectAttributes, version, page, operation, authentication, locale);
}
}