springboot_validation : bean validation

springboot_validation/build.gradle

@@ -21,6 +21,7 @@ repositories {
 dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
 	compileOnly 'org.projectlombok:lombok'
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'

springboot_validation/src/main/java/hello/itemservice/domain/item/Item.java

@@ -1,13 +1,26 @@
 package hello.itemservice.domain.item;
 
 import lombok.Data;
+import org.hibernate.validator.constraints.Range;
+
+import javax.validation.constraints.Max;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
 
 @Data
 public class Item {
 
     private Long id;
+
+    @NotBlank
     private String itemName;
+
+    @NotNull
+    @Range(min = 1000, max = 1000000)
     private Integer price;
+
+    @NotNull
+    @Max(9999)
     private Integer quantity;
 
     public Item() {

springboot_validation/src/test/java/hello/itemservice/validation/BeanValidationTest.java

@@ -0,0 +1,27 @@
+package hello.itemservice.validation;
+
+import hello.itemservice.domain.item.Item;
+import org.junit.jupiter.api.Test;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.Validation;
+import javax.validation.Validator;
+import javax.validation.ValidatorFactory;
+import java.util.Set;
+
+public class BeanValidationTest {
+
+    @Test
+    void beanValidation() {
+        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
+        Validator validator = factory.getValidator();
+
+        Item item = new Item();
+        item.setItemName(" ");
+        item.setPrice(0);
+        item.setQuantity(10000);
+
+        Set<ConstraintViolation<Item>> validations = validator.validate(item);
+        validations.forEach(System.out::println);
+    }
+}