Doubt with webservice method put and delete. How to implement in java?

There are some frameworks that make it easy to develop webservices in java, one of the most popular is Spring .

Example of PUT and DELETE with Spring :

    @RequestMapping(value = "/user/{id}", method = RequestMethod.PUT)
    public ResponseEntity<User> updateUser(@PathVariable("id") long id, @RequestBody User user) {  
        //busca um usuário por id(Parametro passado pro método updateUser)      
        User currentUser = userService.findById(id);  
        if (currentUser==null) {
            return new ResponseEntity<User>(HttpStatus.NOT_FOUND);
        }
        currentUser.setName(user.getName());
        currentUser.setAge(user.getAge());
        currentUser.setSalary(user.getSalary());
        //Faz o update do usuário no banco
        userService.updateUser(currentUser);
        //Retorna o usuário junto com código 200
        return new ResponseEntity<User>(currentUser, HttpStatus.OK);
    }

    @RequestMapping(value = "/user/{id}", method = RequestMethod.DELETE)
    public ResponseEntity<User> deleteUser(@PathVariable("id") long id) {
        //Busca um usuário por id(passado por parâmetro)
        User user = userService.findById(id);
        if (user == null) {
            return new ResponseEntity<User>(HttpStatus.NOT_FOUND);
        }
        //Deleta o usuário
        userService.deleteUser(user);
        return new ResponseEntity<User>(HttpStatus.NO_CONTENT);
    }

Spring is a widely used and very practical framework. One suggestion would be to consider using Vraptor where Controllers are written more cleanly, eg:

@Controller
public class ClienteController {

    @Post("/cliente")
    public void adiciona(Cliente cliente) {...}

    @Path("/")
    public List<Cliente> lista() {
        return ...
    }

    @Get("/cliente")
    public Cliente visualiza(Cliente cliente) {
        return ...
    }
    @Get("/cliente/{codigo}")
    public Cliente listarPorCodigo(Long codigo) {
        return ...
    }

    @Delete("/cliente")
    public void remove(Cliente cliente) { ... }

    @Put("/cliente")
    public void atualiza(Cliente cliente) { ... }
}

Materials:

CRUD with Spring

REST with Vraptor