demo

https://skyline75489.github.io/Heart-First-JavaWeb/18-Rest-Practice.html
对于理解一些东西是极好的.
比如controller的写法

@ResponseStatus(value = HttpStatus.NOT_FOUND)
class ResourceNotFoundException extends RuntimeException{
}
@RestController
@RequestMapping("/person")
public class PersonController {
    @Autowired
    private PersonService personService;
    @RequestMapping(method = RequestMethod.GET)
    public List<Person> getAllPerson(){
        return personService.get();
    }
    @RequestMapping(value = "/{id:[\\d]+}", method = RequestMethod.GET)
    public Person getPerson(
            @PathVariable(value = "id") int id
    ){
        Person result = personService.get(id);
        if(result == null){
            throw new ResourceNotFoundException();
        }
        return result;
    }
    @RequestMapping(value = "", method = RequestMethod.POST)
    public void addPerson(
            @RequestParam int id, @RequestParam String name
    ){
        personService.add(id, name);
    }
    @RequestMapping(value = "/{id:[\\d]+}", method = RequestMethod.DELETE)
    public void deletePerson(
            @PathVariable(value = "id") int id
    ){
        personService.delete(id);
    }
}