springboot_validation : validator

springboot_validation/src/main/java/hello/itemservice/web/validation/ItemValidator.java

@@ -0,0 +1,39 @@
+package hello.itemservice.web.validation;
+
+import hello.itemservice.domain.item.Item;
+import org.springframework.stereotype.Component;
+import org.springframework.util.StringUtils;
+import org.springframework.validation.Errors;
+import org.springframework.validation.Validator;
+
+@Component
+public class ItemValidator implements Validator {
+
+    @Override
+    public boolean supports(Class<?> clazz) {
+        return Item.class.isAssignableFrom(clazz);
+        // item == clazz
+        // item == subItem
+    }
+
+    @Override
+    public void validate(Object target, Errors errors) {
+        Item item = (Item) target;
+
+        if (!StringUtils.hasText(item.getItemName())) {
+            errors.rejectValue("itemName", "required");
+        }
+        if (item.getPrice() == null || item.getPrice() < 1000 || item.getPrice() > 1000000) {
+            errors.rejectValue("price", "range", new Object[]{1000, 1000000}, null);
+        }
+        if (item.getQuantity() == null || item.getQuantity() >= 9999) {
+            errors.rejectValue("quantity", "max", new Object[]{9999}, null);
+        }
+        if (item.getPrice() != null && item.getQuantity() != null ) {
+            int resultPrice = item.getPrice() * item.getQuantity();
+            if (resultPrice < 10000) {
+                errors.reject("totalPriceMin");
+            }
+        }
+    }
+}

springboot_validation/src/main/java/hello/itemservice/web/validation/ValidationItemControllerV2.java

@@ -23,6 +23,7 @@ import java.util.Map;
 public class ValidationItemControllerV2 {
 
     private final ItemRepository itemRepository;
+    private final ItemValidator itemValidator;
 
     @GetMapping
     public String items(Model model) {
@@ -141,7 +142,7 @@ public class ValidationItemControllerV2 {
         return "redirect:/validation/v2/items/{itemId}";
     }
 
-    @PostMapping("/add")
+//    @PostMapping("/add")
     public String addItemV4(@ModelAttribute Item item, BindingResult bindingResult, RedirectAttributes redirectAttributes, Model model) {
 
         if (bindingResult.hasErrors()) {
@@ -178,6 +179,23 @@ public class ValidationItemControllerV2 {
         return "redirect:/validation/v2/items/{itemId}";
     }
 
+    @PostMapping("/add")
+    public String addItemV5(@ModelAttribute Item item, BindingResult bindingResult, RedirectAttributes redirectAttributes, Model model) {
+
+        itemValidator.validate(item, bindingResult);
+
+        // 검증 실패시
+        if (bindingResult.hasErrors()) {
+            return "validation/v2/addForm";
+        }
+
+        // 검증 성공시
+        Item savedItem = itemRepository.save(item);
+        redirectAttributes.addAttribute("itemId", savedItem.getId());
+        redirectAttributes.addAttribute("status", true);
+        return "redirect:/validation/v2/items/{itemId}";
+    }
+
 
     @GetMapping("/{itemId}/edit")
     public String editForm(@PathVariable Long itemId, Model model) {