- 코드 보기
- Member
package hello.servlet.domain.member;
import lombok.Getter;
import lombok.Setter;
@Getter @Setter
public class Member {
private Long id;
private String username;
private int age;
public Member(){}
public Member(String username, int age){
this.username = username;
this.age = age;
}
}- MemberRepository
package hello.servlet.domain.member;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* 동시성 문제가 고려되어 있지 않음. 실무에서는 ConcurrentHashMap이나 AtomicLong 사용 고려
*/
public class MemberRepository {
private static Map<Long, Member> store = new HashMap<>();
private static long sequence = 0L;
private static final MemberRepository instance = new MemberRepository();
public static MemberRepository getInstance(){
return instance;
}
private MemberRepository(){}
public Member save(Member member){
member.setId(++sequence);
store.put(member.getId(), member);
return member;
}
public Member findById(Long id){
return store.get(id);
}
public List<Member> findAll(){
return new ArrayList<>(store.values());
}
public void clearStore(){
store.clear();
}
}- 테스트 코드
package hello.servlet.domain.member;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import java.util.List;
import static org.assertj.core.api.Assertions.*;
import static org.junit.jupiter.api.Assertions.*;
class MemberRepositoryTest {
MemberRepository memberRepository = MemberRepository.getInstance();
@AfterEach
void afterEach(){
memberRepository.clearStore();
}
@Test
void save(){
Member member = new Member("hello", 20);
//when
Member savedMember = memberRepository.save(member);
//then
Member findMember = memberRepository.findById(savedMember.getId());
assertThat(findMember).isEqualTo(savedMember);
}
@Test
void findAll(){
Member member1 = new Member("member1", 20);
Member member2 = new Member("member1", 30);
memberRepository.save(member1);
memberRepository.save(member2);
//when
List<Member> result = memberRepository.findAll();
//then
assertThat(result.size()).isEqualTo(2);
assertThat(result).contains(member1);
assertThat(result).contains(member2);
}
}(2) 서블릿으로 회원 관리 웹 애플리케이션 만들기
package hello.servlet.web.servlet;
import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet(name = "memberFormServlet", urlPatterns = "/servlet/members/new-form")
public class MemberFormServlet extends HttpServlet {
private MemberRepository memberRepository = MemberRepository.getInstance();
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
//응답으로 html 파일이 나갈 거라서 위와 같이 설정
PrintWriter w = response.getWriter();
w.write("<!DOCTYPE html>\n" +
"<html>\n" +
"<head>\n" +
" <meta charset=\"UTF-8\">\n" +
" <title>Title</title>\n" +
"</head>\n" +
"<body>\n" +
"<form action=\"/servlet/members/save\" method=\"post\">\n" +
" username: <input type=\"text\" name=\"username\" />\n" +
" age: <input type=\"text\" name=\"age\" />\n" +
" <button type=\"submit\">전송</button>\n" +
"</form>\n" +
"</body>\n" +
"</html>\n");
}
}
지금까진 서블릿과 자바 코드만으로 html 만들기. 동적으로 원하는 html을 만들 순 있었으나 굉장히 복잡하고 비효율적.
다음엔 JSP로 만들어보기!
JSP는 성능과 기능 면에서 다른 템플릿 엔진과의 경쟁에서 밀리면서 사장되어가는 추세.
템플릿 엔진들은 각각 장단점이 있는데 JSP는 조금 다루고 나머지는 Thymeleaf 사용할 것.
Welcome 페이지 변경하기
