[수업창작] 20-05-30

개인적인 메모를 위해 작성된 글이므로 가벼운 참고용으로 봐주세요.

 

기존 구현기능 : 회원가입받아서 파일로 저장(가입시 아이디 중복체크)

추가 구현기능 : 로그인 로그아웃

 

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Scanner;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;


class Main{
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		DB db = new DB();
		MemberDao memberDao = new MemberDao(db);
		MemberService memberService = new MemberService(memberDao);
		MemberController memberController = new MemberController(scanner, memberService);
		
		help();
		while(true) {
			System.out.printf("명령어) ${} ");
			String command = scanner.nextLine();
			if(command.equals("1")) {
				help();
			}
			else if(command.equals("2")) {
				memberController.doCommandJoin();
			}
			else if(command.equals("3")) {
				memberController.doCommandLogin();
			}
			else if(command.equals("4")) {
				memberController.doCommandLogout();
			}
			else if(command.equals("8")) {
				System.out.println("===게시판종료===");
				break;
			}
			else {
				System.out.printf("'%s'는 존재하지 않는 명령어 입니다. 다시 입력하세요.\n", command);
				continue;
			}
		}
	}
	static void help() {
		System.out.println("===게시판시작===");
		System.out.println("<명령어 목록>");
		System.out.println("1) help");
		System.out.println("2) join");
		System.out.println("3) login");
		System.out.println("4) logout");
		System.out.println("8) exit");
	}
}

class MemberController{
	Member loginedMember;
	String userName;
	String userId;
	String userPw;
	Scanner scanner;
	MemberService memberService;
	MemberController(Scanner scanner, MemberService memberService) {
		this.scanner = scanner;
		this.memberService = memberService;
	}
	void doCommandLogout() {
		if(loginedMember==null) {
			System.out.println("이미 로그아웃된 상태입니다.");
		} else {
			System.out.printf("로그아웃하시겠습니까(y/n)? ");
			String LogoutCheck = scanner.nextLine();
			if(LogoutCheck.equals("y")) {
				loginedMember=null;
				System.out.println("정상적으로 로그아웃 됐습니다.");
			}
			else if(LogoutCheck.equals("n")) {
				System.out.println("로그아웃을 취소합니다.");
				return;
			}
			else {
				System.out.println("잘못된 명령어입니다.");
			}
		}
	}
	void doCommandLogin() {
		if(loginedMember==null
				) {
			System.out.printf("로그인 아이디: ");
			String loginId = scanner.nextLine();
			System.out.printf("로그인 비밀번호: ");
			String loginPw = scanner.nextLine();
			loginedMember = memberService.CheckJoinedMember(loginId, loginPw);
			if(loginedMember != null) {
				System.out.println("로그인 성공");
			}
			if(loginedMember == null) {
				System.out.println("로그인 실패. 일치하는 정보가 없습니다.");
			}
		}
		else{
			System.out.println("이미 로그인되셨습니다.");
		}
	}

	void doCommandJoin() {
		if(loginedMember==null) {
			System.out.println("+ 회원가입 시작 +");
			while(true) {
				System.out.printf("이름: ");
				userName = scanner.nextLine();
				if(userName.length()<2) {
					System.out.println("이름은 2자 이상이어야 합니다.");
					continue;
				}
				break;
			}
			while(true) {
				System.out.printf("아이디: ");
				userId = scanner.nextLine();
				if(userId.length()<2) {
					System.out.println("아이디는 2자 이상이어야 합니다.");
					continue;
				}
				if(memberService.isUsedUserId(userId)) {
					continue;
				}
				break;
			}
			while(true) {
				boolean PwValid = true;
				while(true) {
					System.out.printf("비밀번호: ");
					userPw = scanner.nextLine();
					if(userPw.length()<2) {
						System.out.println("비밀번호는 2자 이상이어야 합니다.");
						continue;
					}
					break;
				}
				while(true) {
					System.out.printf("비밀번호 확인: ");
					String userPwCheck = scanner.nextLine();
					if(userPwCheck.equals(userPw)==false) {
						System.out.println("일치하지 않습니다. 다시 입력해주세요.");
						PwValid = false;
						break;
					}
					break;
				}
				if(PwValid) {
					break;
				}
			}
			memberService.join(userName, userId, userPw);
		}
		else {
			System.out.println("로그아웃을 먼저 진행하세요.");
		}
	}
}

class MemberService{
	MemberDao memberDao;
	MemberService(MemberDao memberDao) {
		this.memberDao = memberDao;
	}

	Member CheckJoinedMember(String loginId, String loginPw) {
		Member member = memberDao.getJoinedMember(loginId, loginPw);
		return member;
	}

	boolean isUsedUserId(String userId) {
		Member member = memberDao.getMemberByUserId(userId);
		if(member==null) {
			return false;
		}
		else {
			System.out.println("이미 가입된 아이디입니다. 다시 입력해주세요.");
			return true;
		}
	}
	void join(String userName, String userId, String userPw) {
		if(isUsedUserId(userId)==false) {
			memberDao.add(userName, userId, userPw);
		}
	}
}

class Member{
	public int id;
	public String regDate;
	public String userName;
	public String userId;
	public String userPw;
	public Member() {
		super();
	}
	public Member(int id, String regDate, String userName, String userId, String userPw) {
		super();
		this.id = id;
		this.regDate = regDate;
		this.userName = userName;
		this.userId = userId;
		this.userPw = userPw;
	}
}

class MemberDao{
	DB db;
	MemberDao(DB db) {
		super();
		this.db = db;
	}
	
	Member getJoinedMember(String loginId, String loginPw) {
		return db.getJoinedMember(loginId, loginPw);
	}

	void add(String userName, String userId, String userPw) {
		System.out.println("새로운 회원의 정보를 저장합니다.");
		int id = getLastMemberId()+1;
		String regDate = Util.getNowDate();
		Member member = new Member(id, regDate, userName, userId, userPw);
		db.add(member);
		setNewLastMemberId(id);
	}
	void setNewLastMemberId(int id) {
		db.setNewLastMemberId(id);
	}
	Member getMemberByUserId(String userId) {
		return db.getMemberByUserId(userId);
	}
	int getLastMemberId() {
		return db.getLastMemberId();
	}
}

class DB{
	int getLastMemberId(){
		int lastId = 0 ;
		String filePath = "member/lastId.txt";
		if(isFileExist(filePath)) {
			lastId = Integer.parseInt(getFileContents(filePath));
		} else {
			lastId = 0;
			writeFileContents(filePath, lastId + "");
		}
		return lastId;
	}
	
	Member getJoinedMember(String loginId, String loginPw) {
		List<Member> members = getMembers();
		for(Member member : members) {
			if(member.userId.equals(loginId)) {
				if(member.userPw.equals(loginPw)) {
					return member;
				}
			}
		}
		return null;
	}
	
	Member getMemberByUserId(String joinUserId) {
		List<Member> members = getMembers();
		for( Member member :  members) {
			if(member.userId.equals(joinUserId)) {
				return member;
			}
		}
		return null;
	}
	List<Member> getMembers() {
		List<Member> members = new ArrayList<>();
		for(int i = 1; i<=getLastMemberId(); i++) {
			String filePath = "member/"+ i + ".txt";
			Member member = readMemberFromJSonFile(filePath);
			if(member !=null) {
				members.add(member);
			}
		}
		return members;
	}
	Member readMemberFromJSonFile(String filePath) {
		ObjectMapper mapper = new ObjectMapper();
		Member member = null;
		try {
			member = mapper.readValue(new File(filePath), Member.class);
		} catch (JsonParseException e) {
			e.printStackTrace();
		} catch (JsonMappingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return member;
	}
	
	void setNewLastMemberId(int NewLastMemberId) {
		String filePath = "member/lastId.txt";
		writeFileContents(filePath, NewLastMemberId+"");
	}
	void writeFileContents(String filePath, String lastId) {
		BufferedOutputStream bs = null;
		try {
			bs = new BufferedOutputStream(new FileOutputStream(filePath));
			bs.write(lastId.getBytes());

		} catch (Exception e) {
	                e.getStackTrace();
		}finally {
			try {
				bs.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		} 
	}
	String getFileContents(String filePath) {
		String lastIdStr = null;
		try {
	        FileInputStream fileStream = null;
	        fileStream = new FileInputStream(filePath);
	        byte[ ] readBuffer = new byte[fileStream.available()];
	        while (fileStream.read( readBuffer ) != -1){}
	        lastIdStr = new String(readBuffer);
	        fileStream.close();
	    } catch (Exception e) {
		e.getStackTrace();
	    }
		return lastIdStr;
	}
	boolean isFileExist(String filePath) {
		File f = new File(filePath);
	    if(f.isFile()) {
	        return true;  
	    } else {
	        return false;
	    }
	}
	void add(Member member) {
		String filePath = "member/"+member.id+".txt";
		ObjectMapper mapper = new ObjectMapper();
		try {
			mapper.writeValue(new File(filePath), member);
		} catch (JsonGenerationException e) {
			e.printStackTrace();
		} catch (JsonMappingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

class Util {
	static String getNowDate() {
		Calendar cal = Calendar.getInstance();
		SimpleDateFormat Date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		String dateStr = Date.format(cal.getTime());
		return dateStr;
	}
}