Boot - Board

1 개발환경

• 공통 폴더 생성
• JDK 설치
  https://www.oracle.com/java/technologies/downloads/#java8-demos-windows
• 이클립스 설치 (EClipse IDE for Java EE Developers)
  https://www.eclipse.org/downloads/
• 워크스페이스 생성
• JDK 추가, 힙 최소, 최대 메모리 수치 늘리기

# eclipse.ini
-vm jdk, -vargs -Xms1024m -Xms2048m 

• STS 플러그인 설치
  
• Gradle (Minimalist Gradle Editor) / Maven 설치
• 워크스페이스 구조
  
• General > Worspace 인코딩 UTF-8
  

2 프로젝트 생성

• File > New > Spring Starter Project
  

-Check if port in use

netstat -aof | findstr :8080

• HeyWorld 생성
  

HelloController.java

package com.example.demo.controller;

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

@RestController
public class HelloController {
	@RequestMapping("/")
	public String hello() {
		return "Hey World";
	}
}

DemoApplication.java

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/*
 * @SpringBootApplication includes
 * @EnableAutoConfiguration
 * @ComponentScan
 * @Configuration
 */
@SpringBootApplication
public class DemoApplication {

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

}

3 DB 연결

• MySQL 설치
  https://dev.mysql.com/downloads/installer/
• application.properties로 데이터 소스 생성
• @Bean으로 데이터 소스 설정
• 커넥션 풀 라이브러리는 HikariCP사용 (우수한 성능)
• board? = DB이름
  application.properties

spring.datasource.hikari.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.hikari.jdbc-url=jdbc:mysql://localhost:3306/board?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
spring.datasource.hikari.username=username
spring.datasource.hikari.password=password
spring.datasource.hikari.connection-test-query=SELECT NOW() FROM dual

• MyBatis (SQL매퍼 프레임워크) 사용해서 쿼리와 코드 분리
  DBConfig.java

package board.configuration;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

@Configuration
@PropertySource("classpath:/application.properties")
public class DBConfig {
	
	// Add myBatis, 2021-10-02
	@Autowired
	private ApplicationContext appContext;
	
	// Add HikariCP
	@Bean
	@ConfigurationProperties(prefix="spring.datasource.hikari") //spring.datasource.hikari 로 시작하는 설정을 통해서 하카리CP 설정 만듬 
	public HikariConfig hikariConfig() {
		return new HikariConfig();
	}
	
	// Add HikariCP
	@Bean
	public DataSource dataSource() throws Exception{
		DataSource dataSource = new HikariDataSource(hikariConfig());
		System.out.println(dataSource.toString());
		return dataSource;
	}
	
	// Add myBatis, 2021-10-02
	@Bean
	public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception{
		SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
		sqlSessionFactoryBean.setDataSource(dataSource);
		//mapper는 앱에서 사용할 SQL을 담은 XML 파일을 의미함. 
		sqlSessionFactoryBean.setMapperLocations(appContext.getResources("classpath:/mapper/**/sql-*.xml"));
		return sqlSessionFactoryBean.getObject();
	}
	
}

4 유닛테스트

JUnit 테스트 실행

package board;

import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class BoardApplicationTest {
	
	@Autowired
	private SqlSessionTemplate sqlSession;
	
	@Test
	public void contextLoads() {
	}
	
	@Test 
	public void testSqlSession() throws Exception{
		System.out.println(sqlSession.toString());
		System.out.println("SUCCESS");
	}
}

여기까지하면 기본 설정 완료

4 Model 구성

• 룸북 (자주 사용하는 코드를 어노테이션으로 자동 생성해주는 라이브러리) 추가
• Use for DTO

REF

https://github.com/brettwooldridge/HikariCP#frequently-used

https://github.com/brettwooldridge/HikariCP/wiki/MySQL-Configuration