Java 게시판 #8일차

기능을 실행하는 역할을 App에서 ArticleController로 이전

• App 클래스

  package com.KoreaIT.java.BasicAM;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Scanner;
  
  import com.KoreaIT.java.BasicAM.controller.ArticleController;
  import com.KoreaIT.java.BasicAM.controller.Controller;
  import com.KoreaIT.java.BasicAM.controller.MemberController;
  import com.KoreaIT.java.BasicAM.dto.Article;
  import com.KoreaIT.java.BasicAM.dto.Member;
  import com.KoreaIT.java.BasicAM.util.Util;
  
  public class App {
  	public static List<Article> articles;
  	public static List<Member> members;
  
  	static {
  		articles = new ArrayList<>();
  		members = new ArrayList<>();
  	}
  
  	public void run() {
  		System.out.println("==프로그램 시작==");
  
  		makeTestData();
  
  		Scanner sc = new Scanner(System.in);
  
  		MemberController memberController = new MemberController(members, sc);
  		ArticleController articleController = new ArticleController(articles, sc);
  
  		while (true) {
  			System.out.printf("명령어 ) ");
  			String command = sc.nextLine().trim();
  
  			if (command.length() == 0) {
  				System.out.println("명령어를 입력해주세요");
  				continue;
  			}
  
  			if (command.equals("system exit")) {
  				break;
  			}
  
  			String[] commandBits = command.split(" ");
  
  			if (commandBits.length == 1) {
  				System.out.println("명령어 확인 후 다시 입력해주세요");
  				continue;
  			}
  
  			String controllerName = commandBits[0];
  			String actionMethodName = commandBits[1];
  
  			Controller controller = null;
  
  			if (controllerName.equals("article")) {
  				controller = articleController;
  
  			} else if (controllerName.equals("member")) {
  				controller = memberController;

  // controllerName = commandBits[0]이 "article"과 같다면 articleController 실행
  // controllerName = commandBits[0]이 "member"와 같다면 memberController 실행

  			} else {
  				System.out.println("존재하지 않는 명령어 입니다.");
  				continue;
  			}
  
  			controller.doAction(command, actionMethodName);

  // actionMethodName = commandBits[1] 여기서 commandBits[1]은 사용자의 기입 내용에 따라 write, list등이 저장된다.

  		}
  
  		System.out.println("==프로그램 끝==");
  
  		sc.close();
  
  	}
  
  	public static void makeTestData() {
  		System.out.println("테스트를 위한 데이터를 생성합니다");
  
  		articles.add(new Article(1, Util.getNowDateStr(), Util.getNowDateStr(), "제목1", "내용1", 11));
  		articles.add(new Article(2, Util.getNowDateStr(), Util.getNowDateStr(), "제목2", "내용2", 22));
  		articles.add(new Article(3, Util.getNowDateStr(), Util.getNowDateStr(), "제목3", "내용3", 33));
  	}
  }

• ArticleController 클래스

  package com.KoreaIT.java.BasicAM.controller;
  
  	import java.util.List;
  	import java.util.Scanner;
  
  	import com.KoreaIT.java.BasicAM.dto.Article;
  	import com.KoreaIT.java.BasicAM.util.Util;
  
  	public class ArticleController extends Controller {
  
  		private List<Article> articles;
  		private Scanner sc;
  		private String command;
  		private String actionMethodName;
  
  		public ArticleController(List<Article> articles, Scanner sc) {
  			this.articles = articles;
  			this.sc = sc;
  		}
  
  		public void doAction(String command, String actionMethodName) {
  			this.command = command;
  			this.actionMethodName = actionMethodName;
  
  			switch (actionMethodName) {
  			case "list":
  				showList();
  				break;
  			case "write":
  				doWrite();
  				break;
  			case "detail":
  				showDetail();
  				break;
  			case "modify":
  				doModify();
  				break;
  			case "delete":
  				doDelete();
  				break;
  			}
  		}
  
  		public void showList() {
  			if (articles.size() == 0) {
  				System.out.println("게시글이 없습니다");
  				return;
  			}
  			System.out.println("번호    /      제목     /     조회    ");
  			String tempTitle = null;
  			for (int i = articles.size() - 1; i >= 0; i--) {
  				Article article = articles.get(i);
  				if (article.title.length() > 4) {
  					tempTitle = article.title.substring(0, 4);
  					System.out.printf("%4d	/    %6s    /   %4d\n", article.id, tempTitle + "...", article.hit);
  					continue;
  				}
  
  				System.out.printf("%4d	/    %6s    /   %4d\n", article.id, article.title, article.hit);
  			}
  
  		}
  
  		public void doWrite() {
  			int id = articles.size() + 1;
  			String regDate = Util.getNowDateStr();
  			System.out.printf("제목 : ");
  			String title = sc.nextLine();
  			System.out.printf("내용 : ");
  			String body = sc.nextLine();
  
  			Article article = new Article(id, regDate, regDate, title, body);
  		articles.add(article);
  
  			System.out.printf("%d번 글이 생성 되었습니다\n", id);
  
  		}
  
  		public void showDetail() {
  			String[] commandBits = command.split(" ");
  
  			int id = Integer.parseInt(commandBits[2]);
  
  			Article foundArticle = getArticleById(id);
  
  			if (foundArticle == null) {
  				System.out.printf("%d번 게시물은 존재하지 않습니다.\n", id);
  				return;
  			}
  
  			foundArticle.increaseHit();
  			System.out.printf("번호 : %d\n", foundArticle.id);
  			System.out.printf("작성날짜 : %s\n", foundArticle.regDate);
  			System.out.printf("수정날짜 : %s\n", foundArticle.updateDate);
  			System.out.printf("제목 : %s\n", foundArticle.title);
  			System.out.printf("내용 : %s\n", foundArticle.body);
  			System.out.printf("조회 : %d\n", foundArticle.hit);
  
  		}
  
  		public void doModify() {
  			String[] commandBits = command.split(" ");
  
  			int id = Integer.parseInt(commandBits[2]);
  
  			Article foundArticle = getArticleById(id);
  
  			if (foundArticle == null) {
  				System.out.printf("%d번 게시물은 존재하지 않습니다.\n", id);
  				return;
  			}
  
  			System.out.printf("제목 : ");
  			String title = sc.nextLine();
  			System.out.printf("내용 : ");
  			String body = sc.nextLine();
  			String updateDate = Util.getNowDateStr();
  
  			foundArticle.title = title;
  			foundArticle.body = body;
  			foundArticle.updateDate = updateDate;
  
  			System.out.printf("%d번 게시물을 수정했습니다\n", id);
  
  		}
  
  		public void doDelete() {
  			String[] commandBits = command.split(" ");
  
  			int id = Integer.parseInt(commandBits[2]);
  
  			int foundIndex = getArticleIndexById(id);
  
  			if (foundIndex == -1) {
  				System.out.printf("%d번 게시물은 존재하지 않습니다.\n", id);
  				return;
  			}
  			articles.remove(foundIndex);
  			System.out.printf("%d번 게시물을 삭제했습니다\n", id);
  
  		}
  
  		public int getArticleIndexById(int id) {
  			int i = 0;
  			for (Article article : articles) {
  				if (article.id == id) {
  					return i;
  				}
  				i++;
  			}
  			return -1;
  		}
  
  		public Article getArticleById(int id) {
  
  			int index = getArticleIndexById(id);
  
  			if (index != -1) {
  				return articles.get(index);
  			}
  
  			return null;
  		}
  
  	}

개념

• Switch 문
  1) if문과 마찬가지로 조건문이지만 변수가 어떤값을 갖느냐에 따라 실행문이 선택