10 롬복(lombok)과 리팩터링(refactoring)
# 롬복과 리팩터링
## 미션
롬복을 활용하여 기존 코드를 리팩터링 하시오.
## 02:32 롬복 라이브러리 추가
#### firstproject/build.gradle
```
plugins {
id 'org.springframework.boot' version '2.6.6' // 스프링 부트 버전
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17' // JDK 버전
repositories {
mavenCentral()
}
dependencies {
// 10강: 롬복 추가
compileOnly 'org.projectlombok:lombok'
annotationProcessor 'org.projectlombok:lombok'
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-mustache'
implementation 'org.springframework.boot:spring-boot-starter-web'
runtimeOnly 'com.h2database:h2'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
test {
useJUnitPlatform()
}
```
#### ⚠️ 최신 IntelliJ는 롬복 플러그인을 자체적으로 포함합니다.
## 06:17 리팩터링, 코드 개선하기
#### ../dto/ArticleForm
```
package com.example.firstproject.dto;
import com.example.firstproject.entity.Article;
import lombok.AllArgsConstructor;
import lombok.ToString;
@AllArgsConstructor
@ToString
public class ArticleForm {
private String title;
private String content;
public Article toEntity() {
return new Article(null, title, content);
}
}
```
#### ../entity/Article
```
package com.example.firstproject.entity;
import lombok.AllArgsConstructor;
import lombok.ToString;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
@AllArgsConstructor
@ToString
public class Article {
@Id
@GeneratedValue
private Long id;
@Column
private String title;
@Column
private String content;
}
```
## 09:35 로그 남기기
#### ../controller/ArticleController
```
package com.example.firstproject.controller;
import com.example.firstproject.dto.ArticleForm;
import com.example.firstproject.entity.Article;
import com.example.firstproject.repository.ArticleRepository;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
@Controller
@Slf4j // 로깅을 위한 롬복 어노테이션
public class ArticleController {
@Autowired
private ArticleRepository articleRepository;
@GetMapping("/articles/new")
public String newArticleForm() {
return "articles/new";
}
@PostMapping("/articles/create")
public String createArticle(ArticleForm form) {
log.info(form.toString()); // println() 을 로깅으로 대체!
Article article = form.toEntity();
log.info(article.toString()); // println() 을 로깅으로 대체!
Article saved = articleRepository.save(article);
log.info(saved.toString()); // println() 을 로깅으로 대체!
return "";
}
}
```
## 🔥 구글링 훈련하기
- java lombok 사용법
- 리팩터링이란
- 로깅이란
- @AllArgsConstructor
- @ToString
- @Slf4j