Controller or RestController

Question

i'm new to jEE, and this is my first jEE code using spring. The code bellow is working fine. He just print the string index when i go to my localhost; and otherwise he print handling error.

My question is: Why this code isn't working anymore if I use @Controller instead of @RestController

I can't find any simple explanation in the docs from spring and I was hoping someone could explain this.

I have the feelings that a controller alone can't work without something like thymeleaf (I know if I were using thymeleaf the string index would be replaced by the index page from the ressources folder) where a RestController might be returning data as xml or json or something else.

Thanks

@RestController public class HelloController implements ErrorController { @RequestMapping("/") public String index() { return "index"; } @RequestMapping("/error") public String error() { return "gestion erreur"; } @Override public String getErrorPath() { return "/error"; } }

RestController is also a controller mixed with ResponseBody annotation. Please share what kind of error are you getting if using Controller. — Avinash Sagar
– Avinash Sagar, Commented Nov 10, 2018 at 17:54

Srinivasu Kotla · Accepted Answer · 2018-11-10 18:08:20Z

The job of @Controller is to create a Map of model object and find a view but @RestController simply return the object and object data is directly written into HTTP response as JSON or XML.

The @Controller is a common annotation which is used to mark a class as Spring MVC Controller while @RestController is a special controller used in RESTFul web services and the equivalent of @Controller + @ResponseBody.

If you want the same functionality of @RestController without using it you can use @Controller and @ResponseBody.

@Controller public class HelloController{ @RequestMapping("/") @ResponseBody public String index() { return "index"; } }

Thanks, problem solved. I was thinking right then, but I didn't knew about ResponseBody.

RandomDev · Accepted Answer · 2024-01-23 11:42:40Z

This is how I get something: Part in @RestController: @GetMapping("getSomething") public ResponseEntity<?> getSomething(){ return ResponseEntity.status(HttpStatus.OK).body(service.getSomeTHing()); } Part in @Service: public List<SomethingDTO> getSomething(){ List<Something> somethings = sr.findAll(); List<SomethingDTO> somethingsDTO = new LinkedList<>(); for (Something s: somethings) { SomethingsDTO dto = new SomethingsDTO(); BeanUtils.copyProperties(p, dto); somethingsDTO.add(dto); } return somethingsDTO; } And this is how I save something: RestController: @PostMapping("saveSomethings") public ResponseEntity<?> saveSomething(SomethingDTO something){ if (something.getSomething() == "") { throw new EmptyFieldsException("No fields can be empty."); } if (glumac.getSomething().length() != 7) throw new InvalidLengthException("Length must be 7", somethings.getSomething().length()); Integer idNewSomething = service.saveSomething(something); if (idNewSomething == -1) throw new SavingErrorException("Error while saving into database."); return ResponseEntity.ok("Success, new id is: "+idNewSomething); } Service: public int saveSomething(SomethingDTO something) { Something noviSomething = new Something(); noviSomething.setSomething(something.getSomething()); try { Something s = sr.save(newSomething); return s.getIdSomething(); } catch (Exception e) { e.printStackTrace(); return -1;`enter code here` } }

}

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