## shorturl MVC 구조 설계 및 단축 URL 생성 기능 구현

src/shorturl/Client.java

@@ -0,0 +1,25 @@
+package shorturl;
+
+import shorturl.controller.ShortUrlController;
+import shorturl.repository.ShortUrlRepository;
+import shorturl.service.Base62Converter;
+import shorturl.service.ShortUrlService;
+import shorturl.view.InputView;
+import shorturl.view.OutputView;
+
+public class Client {
+
+    public static void main(String[] args) {
+        InputView inputView = new InputView();
+        OutputView outputView = new OutputView();
+        ShortUrlRepository repository = new ShortUrlRepository();
+        Base62Converter converter = new Base62Converter();
+        ShortUrlService shortUrlService =
+                new ShortUrlService(repository, converter);
+
+        ShortUrlController shortUrlController =
+                new ShortUrlController(inputView, outputView, shortUrlService);
+
+        shortUrlController.run();
+    }
+}

src/shorturl/controller/ShortUrlController.java

@@ -0,0 +1,37 @@
+package shorturl.controller;
+
+import shorturl.service.ShortUrlService;
+import shorturl.view.InputView;
+import shorturl.view.OutputView;
+
+public class ShortUrlController {
+
+    private final InputView inputView;
+    private final OutputView outputView;
+    private final ShortUrlService shortUrlService;
+
+    public ShortUrlController(InputView inputView,
+                              OutputView outputView,
+                              ShortUrlService shortUrlService) {
+        this.inputView = inputView;
+        this.outputView = outputView;
+        this.shortUrlService = shortUrlService;
+    }
+
+    public void run() {
+        while (true) {
+            String originalUrl = inputView.readOriginalUrl();
+
+            if (originalUrl.equals("exit")) {
+                break;
+            }
+
+            String shortUrl = shortUrlService.createShortUrl(originalUrl);
+            outputView.printShortUrl(shortUrl);
+
+            String inputShortUrl = inputView.readShortUrl();
+            String redirectUrl = shortUrlService.findOriginalUrl(inputShortUrl);
+            outputView.redirectToOriginalUrl(redirectUrl);
+        }
+    }
+}

src/shorturl/repository/ShortUrlRepository.java

@@ -0,0 +1,22 @@
+package shorturl.repository;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class ShortUrlRepository {
+
+    private final Map<String, String> storage = new HashMap<>();
+    private int sequence = 1;
+
+    public int nextId() {
+        return sequence++;
+    }
+
+    public void save(String shortUrl, String originalUrl) {
+        storage.put(shortUrl, originalUrl);
+    }
+
+    public String findByShortUrl(String shortUrl) {
+        return storage.get(shortUrl);
+    }
+}

src/shorturl/service/Base62Converter.java

@@ -0,0 +1,19 @@
+package shorturl.service;
+
+public class Base62Converter {
+
+    private static final String BASE62 =
+            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+    public String encode(int id) {
+        StringBuilder shortUrl = new StringBuilder();
+
+        while (id > 0) {
+            int index = id % 62;
+            shortUrl.append(BASE62.charAt(index));
+            id /= 62;
+        }
+
+        return shortUrl.reverse().toString();
+    }
+}

src/shorturl/service/ShortUrlService.java

@@ -0,0 +1,41 @@
+package shorturl.service;
+
+import shorturl.repository.ShortUrlRepository;
+
+public class ShortUrlService {
+
+    private static final String BASE_URL = "https://short-url.com/";
+
+    private final ShortUrlRepository repository;
+    private final Base62Converter converter;
+
+    public ShortUrlService(ShortUrlRepository repository,
+                           Base62Converter converter) {
+        this.repository = repository;
+        this.converter = converter;
+    }
+
+    public String createShortUrl(String originalUrl) {
+        int id = repository.nextId();
+        String shortUrl = converter.encode(id);
+
+        repository.save(shortUrl, originalUrl);
+
+        return BASE_URL + shortUrl;
+    }
+
+    public String findOriginalUrl(String inputShortUrl) {
+        String shortUrl = extractShortUrl(inputShortUrl);
+        String originalUrl = repository.findByShortUrl(shortUrl);
+
+        if (originalUrl == null) {
+            throw new IllegalArgumentException("해당 URL이 없습니다.");
+        }
+
+        return originalUrl;
+    }
+
+    private String extractShortUrl(String inputShortUrl) {
+        return inputShortUrl.replace(BASE_URL, "");
+    }
+}

src/shorturl/view/InputView.java

@@ -0,0 +1,18 @@
+package shorturl.view;
+
+import java.util.Scanner;
+
+public class InputView {
+
+    private final Scanner scanner = new Scanner(System.in);
+
+    public String readOriginalUrl() {
+        System.out.print("원본 URL 입력 (종료: exit): ");
+        return scanner.nextLine();
+    }
+
+    public String readShortUrl() {
+        System.out.print("단축 URL 입력: ");
+        return scanner.nextLine();
+    }
+}

src/shorturl/view/OutputView.java

@@ -0,0 +1,12 @@
+package shorturl.view;
+
+public class OutputView {
+
+    public void printShortUrl(String shortUrl) {
+        System.out.println("생성된 단축 URL: " + shortUrl);
+    }
+
+    public void redirectToOriginalUrl(String originalUrl) {
+        System.out.println("원본 URL로 리다이렉트: " + originalUrl);
+    }
+}