User Resource에서 GET 메서드 구현하기

UserResource

• 전체조회 기능 만들기

package study.rest.webservices.restfulwebservices.user;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserResource {

    private UserDaoService service;

    public UserResource(UserDaoService service) {
        this.service = service;
    }

    //GET /users
    @GetMapping("/users")
    public List<User> retrieveAllUsers() {
        return service.findAll();
    }
}

실행

UserDaoService 단건조회 기능 추가

• findOne()

package study.rest.webservices.restfulwebservices.user;

import org.springframework.stereotype.Component;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Predicate;

@Component
public class UserDaoService {

    private static List<User> users = new ArrayList<>();

    static {
        users.add(new User(1, "김철수", LocalDate.now().minusYears(30)));
        users.add(new User(2, "문상훈", LocalDate.now().minusYears(25)));
        users.add(new User(3, "선우소희", LocalDate.now().minusYears(20)));
    }

    public List<User> findAll() {
        return users;
    }

    public User findOne(int id) {
        Predicate<? super User> predicate = user -> user.getId().equals(id);
        return users.stream().filter(predicate).findFirst().get();
    }
}

UserResource 단건조회 추가

• retrieveUser()

package study.rest.webservices.restfulwebservices.user;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserResource {

    private UserDaoService service;

    public UserResource(UserDaoService service) {
        this.service = service;
    }

    //GET /users
    @GetMapping("/users")
    public List<User> retrieveAllUsers() {
        return service.findAll();
    }

    //GET /users/{id}
    @GetMapping("/users/{id}")
    public User retrieveUser(@PathVariable int id) {
        return service.findOne(id);
    }
}

실행

id 1로 조회가 잘 됩니다. 성공입니다!