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ProductManagement/DBRepository.java

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+package com.example.ProductManagement;
+
+
+//@Repository
+public class DBRepository implements ProductRepository{
+
+    // DBRepository가 왜 필요한가요?
+    // 이미 MapRepository가 DB역할을 해주는거 아닌가요?
+
+
+}

ProductManagement/MapRepository.java

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+package com.example.ProductManagement;
+
+import org.springframework.stereotype.Repository;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Repository
+public class MapRepository implements ProductRepository{
+
+    Map<Long, String> database = new HashMap<Long, String>();
+    Long id = 1L;
+
+    @Override
+    public String add(String val) {
+        database.put(id++, val);
+        return val;
+    }
+
+    @Override
+    public String search(Long productId) {
+        return database.get(productId);
+    }
+
+    @Override
+    public void delete(Long productId) {
+        database.remove(productId);
+    }
+
+    @Override
+    public void update(Long productId, String newName) {
+        database.replace(productId, newName);
+    }
+
+    // database의 HashMap 오브젝트를 한줄씩 문자열로 반환
+    @Override
+    public String getAllProducts() {
+        StringBuilder sb = new StringBuilder();
+
+        for (int i = 1; i < database.size(); i++) {
+            sb.append(String.format("%d : %s\n", i, database.get(i)));
+        }
+
+        return sb.toString();
+    }
+}

ProductManagement/ProductController.java

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+package com.example.ProductManagement;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/boss")
+public class ProductController {
+
+    @Autowired
+    ProductService productService;
+
+    @RequestMapping("/view-all-product")
+    public String getAllProducts() {
+        return productService.getAllProducts();
+    }
+
+    @RequestMapping("/add-product")
+    public String add(@RequestParam("productName") String name) {
+        return productService.add(name);
+    }
+
+    @RequestMapping("/search-product")
+    public String search(@RequestParam("productId") Long productId) {
+        return productService.search(productId);
+    }
+
+    @RequestMapping("/update-product")
+    public void update(
+            @RequestParam("productId") Long productId,
+            @RequestParam("newName") String newName
+    ) {
+        productService.update(productId, newName);
+    }
+
+    @RequestMapping("/delete-product")
+    public void delete(@RequestParam("productId") Long productId) {
+        productService.delete(productId);
+    }
+}

ProductManagement/ProductRepository.java

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+package com.example.ProductManagement;
+
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface ProductRepository {
+
+    abstract public String add(String productName);
+    abstract public String search(Long productId);
+    abstract public void delete(Long productId);
+    abstract public void update(Long productId, String newName);
+    abstract public String getAllProducts();
+
+}

ProductManagement/ProductService.java

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+package com.example.ProductManagement;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ProductService {
+
+    @Autowired
+    private ProductRepository productRepository;
+
+    public String add(String productName) {
+        return productRepository.add(productName);
+    }
+
+    public String search(Long productId) {
+        return productRepository.search(productId);
+    }
+
+    public void update(Long productId, String newName) {
+        productRepository.update(productId, newName);
+    }
+
+    public void delete(Long productId) {
+        productRepository.delete(productId);
+    }
+
+    public String getAllProducts() {
+        return productRepository.getAllProducts();
+    }
+}