Timline Project Spring 설계

Domain Package

 

Memo.java

package com.sparta.week03.domain;

import lombok.Getter;
import lombok.NoArgsConstructor;

import javax.persistence.*;

@NoArgsConstructor // 기본생성자를 만듬
@Getter
@Entity // 테이블과 연계됨을 스프링에게 알려줌

public class Memo extends Timestamped { // 생성,수정 시간을 자동으로 만들어줍니다.
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Id
    private Long id;

    @Column(nullable = false)
    private String username;

    @Column(nullable = false)
    private String contents;

    public Memo(String username, String contents) {
        this.username = username;
        this.contents = contents;
    }

    public Memo(MemoRequestDto requestDto) {
        this.username = requestDto.getUsername();
        this.contents = requestDto.getContents();
    }

    public void update(MemoRequestDto requestDto) {
        this.username = requestDto.getUsername();
        this.contents = requestDto.getContents();
    }
}

 

MemoRepository

package com.sparta.week03.domain;

import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface MemoRepository extends JpaRepository<Memo, Long> {
    List<Memo> findAllByOrderByModifiedAtDesc();
    // Timestamped의 ModifiedAt 을 가져온다.
    // find All By Order By ModifiedAt at Desc
}

 

MemoRequestDto

package com.sparta.week03.domain;

import lombok.Getter;

@Getter
public class MemoRequestDto {
    private String username;
    private String contents;
}

 

Timestamped

package com.sparta.week03.domain;

import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.annotation.LastModifiedDate;
import org.springframework.data.jpa.domain.support.AuditingEntityListener;

import javax.persistence.EntityListeners;
import javax.persistence.MappedSuperclass;
import java.time.LocalDateTime;

@MappedSuperclass // Entity가 자동으로 컬럼으로 인식.
// Timestamped class를 상속한 것이 자동으로 생성시간, 수정시간을 컬럼으로 잡도록 도와줌
@EntityListeners(AuditingEntityListener.class) // 생성/변경 시간을 자동으로 업데이트함.
@Getter // 조회를 위함

public abstract class Timestamped {

    @CreatedDate
    private LocalDateTime createdAt;

    @LastModifiedDate
    private LocalDateTime modifiedAt;
}

 

Service Package

 

Service - Update를 위함

package com.sparta.week03.service;

import com.sparta.week03.domain.Memo;
import com.sparta.week03.domain.MemoRepository;
import com.sparta.week03.domain.MemoRequestDto;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;

@RequiredArgsConstructor
@Service
public class MemoService {

    // 반드시 필요하기에 final 선언
    private final MemoRepository memoRepository;

    @Transactional
    public Long update(Long id, MemoRequestDto requestDto) {
        Memo memo = memoRepository.findById(id).orElseThrow(
                () -> new IllegalArgumentException("아이디가 존재하지 않습니다.")
                // new NullPointerException() 도 된다.
        );
        memo.update(requestDto);
        return memo.getId();
    }
}

 

Controller Package

MemoController

package com.sparta.week03.controller;

import com.sparta.week03.domain.Memo;
import com.sparta.week03.domain.MemoRepository;
import com.sparta.week03.domain.MemoRequestDto;
import com.sparta.week03.service.MemoService;
import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RequiredArgsConstructor
@RestController
public class MemoController {

    private final MemoRepository memoRepository;
    private final MemoService memoService;

    @PostMapping("/api/memos")
    // RequestBody를 사용해야 요청이 올 때 Body의 내용을 Dto에 넣어줌.
    public Memo createMemo(@RequestBody MemoRequestDto requestDto) {
        Memo memo = new Memo(requestDto);
        return memoRepository.save(memo);
    }

    @GetMapping("/api/memos")
    public List<Memo> getMemos() {
        return memoRepository.findAllByOrderByModifiedAtDesc();
    }

    @DeleteMapping("/api/memos/{id}")
    public Long deleteMemo(@PathVariable Long id) {
        memoRepository.deleteById(id);
        return id;
    }

    @PutMapping("/api/memos/{id}")
    public Long updateMemo(@PathVariable Long id, @RequestBody MemoRequestDto requestDto){
        memoService.update(id, requestDto);
        return id;
    }

}

 

Week03Application

package com.sparta.week03;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

@EnableJpaAuditing // 내용이 바뀌었을 때 자동으로 Spring이 반영하도록 함
@SpringBootApplication
public class Week03Application {

    public static void main(String[] args) {
        SpringApplication.run(Week03Application.class, args);
    }

    
}

 

패키지 구성

 

+ 24시간 이내의 타임라인만 가져오기

JPA 사용 심화

- 위의 링크를 참조하여 수정한다.