bean validation

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'
}

implementation 'org.springframework.boot:spring-boot-starter-validation' 추가

package hello.itemservice.domain.item;

import lombok.Data;
import org.hibernate.validator.constraints.Range;
import org.springframework.stereotype.Service;

import javax.validation.constraints.Max;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;

@Data
@Service
public class Item {

    private Long id;

    @NotBlank(message = "공백x")
    private String itemName;

    @NotNull
    @Range(min = 1000, max = 1000000)
    private Integer price;

    @NotNull
    @Max(9999)
    private Integer quantity;

    public Item() {
    }

    public Item(String itemName, Integer price, Integer quantity) {
        this.itemName = itemName;
        this.price = price;
        this.quantity = quantity;
    }
}

domain에 어노테이션 추가

 

    @PostMapping("/add") // WebDataBinder를 사용하기 위해서는 모델 앞에 @Validated 어노테이션을 추가해야한다.
    public String addItemV6(@Validated @ModelAttribute Item item, BindingResult bindingResult, RedirectAttributes redirectAttributes, Model model) {
        //WebDataBinder로 인해 검증 데이터가 BindingResult에 알아서 쌓이게 된다.
        //타입 검증

        if(bindingResult.hasErrors()){
            log.info("errors={}",bindingResult);
            return "validation/v3/addForm";
        }

        Item savedItem = itemRepository.save(item);
        redirectAttributes.addAttribute("itemId", savedItem.getId());
        redirectAttributes.addAttribute("status", true);
        return "redirect:/validation/v3/items/{itemId}";
    }

불러오는 Object(Item) 앞에 @Validated  추가해준다.