1) 서비스, 서비스 구현 패키지 각각 생성

kr.or.connect.guestbook.service
kr.or.connect.guestbook.service.impl

2) 서비스 인터페이스 생성

• service패키지 내에 인터페이스 생성

GuestbookService.java

package kr.or.connect.guestbook.service;

import java.util.List;

import kr.or.connect.guestbook.dto.Guestbook;

public interface GuestbookService {
	public static final Integer LIMIT = 5;
	public List<Guestbook> getGuestbooks(Integer start);
	public int deleteGuestbook(Long id, String ip);
	public Guestbook addGuestbook(Guestbook guestbook, String ip);
	public int getCount();
}

3) 서비스 구현 클래스 생성

• service.impl 패키지 내에 클래스 생성
• @Transactional 어노테이션 -> 전체 메소드가 예외 없이 실행되어야만 메소드 실행 완료, 만약 예외 발생 시 실행 취소됨

GuestbookServiceImpl.java

package kr.or.connect.guestbook.service.impl;

import java.util.Date;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import kr.or.connect.guestbook.dao.GuestbookDao;
import kr.or.connect.guestbook.dao.LogDao;
import kr.or.connect.guestbook.dto.Guestbook;
import kr.or.connect.guestbook.dto.Log;
import kr.or.connect.guestbook.service.GuestbookService;

@Service //Service 레이어임을 명시
public class GuestbookServiceImpl implements GuestbookService {
	@Autowired // 자동으로 객체를 생성해 주입시켜줌
	GuestbookDao guestbookDao;
	
	@Autowired
	LogDao logDao;

	@Override
	@Transactional // Read only 형태로 connection 사용함
	public List<Guestbook> getGuestbooks(Integer start) {
		//Guestbook 목록을 가져오는 메소드
		List<Guestbook> list = guestbookDao.selectAll(start, LIMIT);
		return list;
	}
	
	@Override
	@Transactional(readOnly=false) //수정 가능한 형태로 connection 사용함
	public int deleteGuestbook(Long id, String ip) {
		//id에 해당하는 값을 delete, delete되었을 때 log에 저장
		int deleteCount = guestbookDao.deleteById(id);
		
		Log log = new Log();
		log.setId(id);
		log.setIp(ip);
		log.setMethod("delete");
		log.setRegdate(new Date());
		logDao.insert(log);
		return deleteCount;
	}

	@Override
	@Transactional(readOnly=false)
	public Guestbook addGuestbook(Guestbook guestbook, String ip) {
		// regdate 값은 가져오지 않았으므로 따로 설정해줌
		guestbook.setRegdate(new Date());
		Long id = guestbookDao.insert(guestbook);
		guestbook.setId(id);
		
		Log log = new Log();
		log.setIp(ip);
		log.setMethod("insert");
		log.setRegdate(new Date());
		
		logDao.insert(log);
		// 입력 완료된 guestbook 반환
		return guestbook;
	}

	@Override
	@Transactional
	public int getCount() {
		// 페이징 처리를 위해 전체의 건수를 가져옴
		return guestbookDao.selectCount();
	}
}

4) 테스트 클래스 생성

• service.impl 패키지에 테스트 클래스 생성
• insert 함수 테스트
  GuestbookServiceTest.java

package kr.or.connect.guestbook.service.impl;

import java.util.Date;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import kr.or.connect.guestbook.config.ApplicationConfig;
import kr.or.connect.guestbook.dto.Guestbook;
import kr.or.connect.guestbook.service.GuestbookService;

public class GuestbookServiceTest {
	public static void main(String[] args) {
		ApplicationContext ac = new AnnotationConfigApplicationContext(ApplicationConfig.class);
		GuestbookService guestbookService = ac.getBean(GuestbookService.class);
		
		Guestbook guestbook = new Guestbook();
		guestbook.setName("kim");
		guestbook.setContent("test");
		guestbook.setRegdate(new Date());
		Guestbook result = guestbookService.addGuestbook(guestbook, "127.0.0.1");
		System.out.println(result);
	}
}