[BE5] 조정인

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

README.md

@@ -1 +1,7 @@
-# code-review
+# 명언 게시판 만들기
+DevCourse Backend 4기
+
+
+https://velog.io/@jxxnging/JAVA-명언-게시판-만들기-1
+
+https://velog.io/@jxxnging/JAVA-명언-게시판-만들기-2

db/wiseSaying/1.json

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+{
+  "id": 1,
+  "content": "너 자신을 알라",
+  "author": "소크라테스"
+}

db/wiseSaying/2.json

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+{
+  "id": 2,
+  "content": "주사위는 던져졌다",
+  "author": "율리우스 카이사르"
+}

db/wiseSaying/3.json

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+{
+  "id": 3,
+  "content": "그래도 지구는 돈다",
+  "author": "갈릴레오 갈릴레이"
+}

db/wiseSaying/5.json

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+{
+  "id": 5,
+  "content": "집에 가고 싶다",
+  "author": "작자미상"
+}

db/wiseSaying/data.json

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+[
+	{
+		"id": 5,
+		"content": "집에 가고 싶다",
+		"author": "작자미상"
+	},
+	{
+		"id": 3,
+		"content": "그래도 지구는 돈다",
+		"author": "갈릴레오 갈릴레이"
+	},
+	{
+		"id": 2,
+		"content": "주사위는 던져졌다",
+		"author": "율리우스 카이사르"
+	},
+	{
+		"id": 1,
+		"content": "너 자신을 알라",
+		"author": "소크라테스"
+	}
+]

db/wiseSaying/lastId.txt

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+5

src/Main.java

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+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) {
+        String action = "";
+        String content = "";
+        String author = "";
+
+        int targetId = 0;
+        int id = 1;
+        if (getLastId() != 1) {
+            id = getLastId() + 1;
+        }
+
+        ArrayList<WiseSaying> list = load();
+
+        Scanner sc = new Scanner(System.in);
+
+        System.out.println("== 명언 앱 ==");
+
+        while (!action.equals("종료")) {
+            System.out.print("명령) ");
+            action = sc.nextLine();
+
+            switch (action) {
+                case "등록":
+                    System.out.print("명언 : ");
+                    content = sc.nextLine();
+                    System.out.print("작가 : ");
+                    author = sc.nextLine();
+
+                    WiseSaying saying = new WiseSaying(id, content, author);
+                    save(saying);
+                    list.add(saying);
+                    System.out.println(id + "번 명언이 등록되었습니다.");
+
+                    id++;
+                    updateLastId(id);
+                    break;
+
+                case "목록":
+                    Collections.sort(list, new Comparator<WiseSaying>() {
+                        public int compare(WiseSaying ws1, WiseSaying ws2) {
+                            return Integer.compare(ws2.getId(), ws1.getId());
+                        }
+                    });
+
+                    System.out.println("번호 / 작가 / 명언");
+                    System.out.println("----------------------");
+
+                    if (list.isEmpty()) {
+                        System.out.println("등록된 명언이 없습니다.");
+                    } else {
+                        for (WiseSaying ws : list) {
+                            System.out.println(ws.getId() + " / " + ws.getAuthor() + " / " + ws.getContent());
+                        }
+                    }
+                    break;
+
+                case "삭제":
+                    System.out.print("id=");
+                    targetId = sc.nextInt();
+                    sc.nextLine();
+
+                    WiseSaying deleteWS = getSaying(list, targetId);
+                    if (deleteWS != null) {
+                        list.remove(deleteWS);
+                        delete(deleteWS);
+                    }
+                    break;
+
+                case "수정":
+                    System.out.print("id=");
+                    targetId = sc.nextInt();
+                    sc.nextLine();
+
+                    WiseSaying updateWS = getSaying(list, targetId);
+                    if (updateWS != null) {
+                        System.out.println("명언(기존) : " + updateWS.getContent());
+                        System.out.print("명언 : ");
+                        content = sc.nextLine();
+
+                        System.out.println("작가(기존) : " + updateWS.getAuthor());
+                        System.out.print("작가 : ");
+                        author = sc.nextLine();
+
+                        updateWS.setContent(content);
+                        updateWS.setAuthor(author);
+                        save(updateWS);
+                        System.out.println(targetId + "번 명언이 수정되었습니다.");
+                    } else {
+                        System.out.println(targetId + "번 명언은 존재하지 않습니다.");
+                    }
+                    break;
+
+                case "빌드":
+                    build(list);
+                    break;
+
+                case "종료":
+                    if (!list.isEmpty()) {
+                        updateLastId(id - 1);
+                    } else {
+                        updateLastId(1);
+                    }
+                    break;
+
+                default:
+                    System.out.println("올바른 명령어를 입력해주세요.");
+                    break;
+            }
+        }
+
+        sc.close();
+    }
+
+    public static int getLastId() {
+        try {
+            BufferedReader reader = new BufferedReader(new FileReader("db/wiseSaying/lastId.txt"));
+            String lastId = reader.readLine();
+            reader.close();
+            return Integer.parseInt(lastId);
+        } catch (IOException e) {
+            return 1;
+        }
+    }
+
+    public static void updateLastId(int id) {
+        try {
+            FileWriter writer = new FileWriter("db/wiseSaying/lastId.txt");
+            writer.write(String.valueOf(id));
+            writer.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void save(WiseSaying ws) {
+        try {
+            String json = ws.toJson();
+
+            File file = new File("db/wiseSaying/" + ws.getId() + ".json");
+            file.getParentFile().mkdirs();
+
+            FileWriter writer = new FileWriter(file);
+            writer.write(json);
+            writer.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void delete(WiseSaying ws) {
+        try {
+            File file = new File("db/wiseSaying/" + ws.getId() + ".json");
+            if (file.exists()) {
+                if (file.delete()) {
+                    System.out.println(ws.getId() + "번 명언이 삭제되었습니다.");
+                }
+            } else {
+                System.out.println(ws.getId() + "번 명언은 존재하지 않습니다.");
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void build(ArrayList<WiseSaying> list) {
+        try {
+            StringBuilder jsonBuilder = new StringBuilder("[\n");
+
+            for (int i = 0; i < list.size(); i++) {
+                jsonBuilder.append("\t{\n")
+                        .append("\t\t\"id\": ").append(list.get(i).getId()).append(",\n")
+                        .append("\t\t\"content\": \"").append(list.get(i).getContent()).append("\",\n")
+                        .append("\t\t\"author\": \"").append(list.get(i).getAuthor()).append("\"\n")
+                        .append("\t}");
+                if (i < list.size() - 1) {
+                    jsonBuilder.append(",");
+                }
+                jsonBuilder.append("\n");
+            }
+            jsonBuilder.append("]");
+
+            File file = new File("db/wiseSaying/data.json");
+            file.getParentFile().mkdirs();
+
+            FileWriter writer = new FileWriter(file);
+            writer.write(jsonBuilder.toString());
+            writer.close();
+
+            System.out.println("data.json 파일의 내용이 갱신되었습니다.");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static ArrayList<WiseSaying> load() {
+        ArrayList<WiseSaying> list = new ArrayList<WiseSaying>();
+        File dir = new File("db/wiseSaying");
+        File[] files = dir.listFiles((d, name) -> name.endsWith(".json"));
+
+        if (files != null) {
+            for (File file : files) {
+                if (file.getName().equals("data.json")) {
+                    continue;
+                }
+
+                try {
+                    BufferedReader reader = new BufferedReader(new FileReader(file));
+                    StringBuilder json = new StringBuilder();
+                    String line;
+                    while ((line = reader.readLine()) != null) {
+                        json.append(line);
+                    }
+                    reader.close();
+
+                    WiseSaying ws = WiseSaying.fromJson(json.toString());
+                    list.add(ws);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return list;
+    }
+
+    public static WiseSaying getSaying(ArrayList<WiseSaying> list, int id) {
+        for (WiseSaying ws : list) {
+            if (ws.getId() == id) {
+                return ws;
+            }
+        }
+        return null;
+    }
+}