Step1

.gitignore

@@ -38,3 +38,5 @@ out/
 
 ### Mac OS ###
 .DS_Store
+
+study/

build.gradle

@@ -18,6 +18,7 @@ repositories {
 }
 
 dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
     implementation 'org.springframework.boot:spring-boot-starter-jdbc'
     implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
     implementation 'org.springframework.boot:spring-boot-starter-web'
@@ -28,4 +29,4 @@ dependencies {
 
 tasks.named('test') {
     useJUnitPlatform()
-}
+}

src/main/java/gift/Application.java

@@ -8,4 +8,4 @@ public class Application {
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);
     }
-}
+}

src/main/java/gift/GlobalExceptionHandler.java

@@ -0,0 +1,34 @@
+package gift;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@ControllerAdvice
+public class GlobalExceptionHandler {
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<Map<String, List<String>>> handleValidationExceptions(MethodArgumentNotValidException ex) {
+        Map<String, List<String>> errors = new HashMap<>();
+        ex.getBindingResult().getAllErrors().forEach(error -> {
+            System.out.println("  처리 중인 오류: " + error.getDefaultMessage() +
+                    " (필드: " + (error instanceof FieldError ? ((FieldError) error).getField() : "전역 오류") +
+                    ", 코드: " + error.getCode() + ")");
+            if (error instanceof FieldError) {
+                String fieldName = ((FieldError) error).getField();
+                String errorMessage = error.getDefaultMessage();
+                errors.computeIfAbsent(fieldName, k -> new ArrayList<>()).add(errorMessage);
+            } else {
+                errors.computeIfAbsent(error.getObjectName(), k -> new ArrayList<>()).add(error.getDefaultMessage());
+            }
+        });
+        return new ResponseEntity<>(errors, HttpStatus.BAD_REQUEST);
+    }
+}

src/main/java/gift/controller/AdminProductController.java

@@ -0,0 +1,68 @@
+package gift.controller;
+
+import gift.model.Product;
+import gift.repository.ProductDao;
+import jakarta.validation.Valid;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.*;
+
+@Controller
+@RequestMapping("/admin/products")
+public class AdminProductController {
+    private final ProductDao productDao;
+
+    public AdminProductController(ProductDao productDao) {
+        this.productDao = productDao;
+    }
+
+    @GetMapping
+    public String list(Model model) {
+        model.addAttribute("products", productDao.getAllProducts());
+        return "product/list";
+    }
+
+    @GetMapping("/add")
+    public String addForm(Model model) {
+        model.addAttribute("product",new Product(null,null,null,null));
+        return "product/form";
+    }
+
+    @PostMapping("/add")
+    public String add(@Valid @ModelAttribute Product product, BindingResult bindingResult, Model model) {
+        if (bindingResult.hasErrors()) {
+            System.out.println("상품 추가 유효성 검사 실패! 폼 재렌더링.");
+            bindingResult.getAllErrors().forEach(error -> System.out.println("오류: " + error.getDefaultMessage()));
+            return "product/form";
+        }
+        productDao.insertProduct(product);
+        return "redirect:/admin/products";
+    }
+
+    @GetMapping("/edit/{id}")
+    public String editForm(@PathVariable Long id, Model model) {
+        Product product = productDao.getProductById(id);
+        model.addAttribute("product", product);
+        return "product/form";
+    }
+
+    @PostMapping("/edit")
+    public String edit(@Valid @ModelAttribute Product product, BindingResult bindingResult, Model model) {
+        if (bindingResult.hasErrors()) {
+            System.out.println("상품 추가 유효성 검사 실패! 폼 재렌더링.");
+            bindingResult.getAllErrors().forEach(error -> System.out.println("오류: " + error.getDefaultMessage()));
+            return "product/form";
+        }
+
+        System.out.println("상품 수정 성공: " + product.getName());
+        productDao.updateProduct(product.getId(), product, product);
+        return "redirect:/admin/products";
+    }
+
+    @PostMapping("/delete/{id}")
+    public String delete(@PathVariable Long id) {
+        productDao.removeProduct(id);
+        return "redirect:/admin/products";
+    }
+}

src/main/java/gift/controller/ProductController.java

@@ -0,0 +1,43 @@
+package gift.controller;
+
+import gift.model.Product;
+import gift.repository.ProductDao;
+import jakarta.validation.Valid;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RequestMapping("/api")
+@RestController
+public class ProductController {
+    private final ProductDao productDao;
+
+    public ProductController(ProductDao productDao) {
+        this.productDao = productDao;
+    }
+
+    @GetMapping("/products")
+    public List<Product> getAllProducts() {
+        return productDao.getAllProducts();
+    }
+
+    @GetMapping("/products/{id}")
+    public Product getProductById(@PathVariable int id) {
+        return productDao.getProductById(id);
+    }
+
+    @PostMapping("/products")
+    public void addProduct(@Valid @RequestBody Product product) {
+        productDao.insertProduct(product);
+    }
+
+    @DeleteMapping("products/{id}")
+    public void deleteProduct(@PathVariable Long id) {
+        productDao.removeProduct(id);
+    }
+
+    @PatchMapping("/products/{id}")
+    public void updateProduct(@Valid @PathVariable Long id, @RequestBody Product product) {
+        productDao.updateProduct(id, productDao.getProductById(id), product);
+    }
+}

src/main/java/gift/model/Product.java

@@ -0,0 +1,57 @@
+package gift.model;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
+public class Product {
+    private Long id;
+
+    @NotBlank(message = "상품명은 필수 입력 값입니다.")
+    @Size(min = 2, max = 15, message = "상품명은 2자 이상 15자 이하로 입력해주세요.")
+    @Pattern(regexp = "^((?!카카오).)*$", message = "상품명에 '카카오'를 포함할 수 없습니다.")
+    private String name;
+
+    private Integer price;
+    private String image;
+
+    public Product(Long id, String name, Integer price, String imageUrl) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+        this.image = imageUrl;
+    }
+
+    public Long getId() { return id; }
+    public String getName() { return name; }
+    public Integer getPrice() { return price; }
+    public String getImage() { return image; }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+    public void setName(String name) {
+        this.name = name;
+    }
+    public void setPrice(Integer price) {
+        this.price = price;
+    }
+    public void setImage(String image) {
+        this.image = image;
+    }
+
+    public void updateFields(Product partialProduct){
+        if (partialProduct == null) {
+            return;
+        }
+        if (partialProduct.name != null) {
+            this.name = partialProduct.name;
+        }
+        if (partialProduct.price != null) {
+            this.price = partialProduct.price;
+        }
+        if (partialProduct.image != null) {
+            this.image = partialProduct.image;
+        }
+    }
+}

src/main/java/gift/repository/ProductDao.java

@@ -0,0 +1,51 @@
+package gift.repository;
+
+import gift.model.Product;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowMapper;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+@Repository
+public class ProductDao {
+    private final JdbcTemplate jdbcTemplate;
+    private static final ProductRowMapper PRODUCT_ROW_MAPPER = new ProductRowMapper();
+
+    public ProductDao(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; }
+
+    public void insertProduct(Product product) {
+        final var sql = "insert into product(name, price, image) values(?, ?, ?)";
+        jdbcTemplate.update(sql, product.getName(), product.getPrice(), product.getImage());
+    }
+    public List<Product> getAllProducts() {
+        final var sql = "select * from product";
+        return jdbcTemplate.query(sql, PRODUCT_ROW_MAPPER);
+    }
+    public Product getProductById(long id) {
+        final var sql = "select * from product where id = ?";
+        return jdbcTemplate.queryForObject(sql, PRODUCT_ROW_MAPPER,id);
+    }
+    public void removeProduct(long id) {
+        final var sql = "delete from product where id = ?";
+        jdbcTemplate.update(sql, id);
+    }
+    public void updateProduct(Long id, Product product, Product product_changed) {
+        final var sql = "UPDATE product SET name = ?, price = ?, image = ? WHERE id = ?";
+        product.updateFields(product_changed);
+        jdbcTemplate.update(sql, product.getName(), product.getPrice(), product.getImage(),id);
+    }
+    public static class ProductRowMapper implements RowMapper<Product> {
+        @Override
+        public Product mapRow(ResultSet rs, int rowNum) throws SQLException {
+            return new Product(
+                    rs.getLong("id"),
+                    rs.getString("name"),
+                    rs.getInt("price"),
+                    rs.getString("image")
+            );
+        }
+    }
+}

src/main/resources/application.properties

@@ -1 +1,7 @@
 spring.application.name=spring-gift
+spring.h2.console.enabled=true
+spring.sql.init.mode=always
+spring.sql.init.schema-locations=classpath:/scheme.sql
+spring.datasource.url = jdbc:h2:mem:test
+spring.datasource.user = sa
+spring.datasource.password =

src/main/resources/scheme.sql

@@ -0,0 +1,7 @@
+CREATE TABLE product
+(
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    name  VARCHAR(255),
+    price INT,
+    image VARCHAR(255)
+);

src/main/resources/templates/product/form.html

@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <title>상품 등록/수정</title>
+    <meta charset="UTF-8">
+
+</head>
+<body>
+<h1 th:text="${product.id == null} ? '상품 추가' : '상품 수정'"></h1>
+
+<form th:if="${product.id == null}"
+      th:action="@{/admin/products/add}"
+      th:object="${product}"
+      method="post">
+    <div>
+        <label>이름:</label>
+        <input type="text" th:field="*{name}" required />
+        <div th:if="${#fields.hasErrors('name')}" th:errors="*{name}" style="color:red"></div>
+    </div>
+    <div>
+        <label>가격:</label>
+        <input type="number" th:field="*{price}" required />
+        <div th:if="${#fields.hasErrors('price')}" th:errors="*{price}" style="color:red"></div>
+    </div>
+    <div>
+        <label>이미지 URL:</label>
+        <input type="text" th:field="*{image}" required />
+        <div th:if="${#fields.hasErrors('image')}" th:errors="*{image}" style="color:red"></div>
+    </div>
+    <div>
+        <button type="submit">저장</button>
+        <a th:href="@{/admin/products}">취소</a>
+    </div>
+</form>
+
+<form th:if="${product.id != null}"
+      th:action="@{/admin/products/edit}"
+      th:object="${product}"
+      method="post">
+    <input type="hidden" th:field="*{id}" />
+    <div>
+        <label>이름:</label>
+        <input type="text" name="name" th:value="${product.name}" required />
+        <div th:if="${#fields.hasErrors('name')}" th:errors="*{name}" style="color:red"></div>
+    </div>
+    <div>
+        <label>가격:</label>
+        <input type="number" name="price" th:value="${product.price}" required />
+    </div>
+    <div>
+        <label>이미지 URL:</label>
+        <input type="text" name="image" th:value="${product.image}" required />
+    </div>
+    <div style="margin-top: 10px;">
+        <button type="submit">저장</button>
+        <a href="/admin/products">취소</a>
+    </div>
+</form>
+
+</body>
+</html>