[Chapter 11] 유효성 검사

### 81. 유효성검사 자동화-AOP처리 1탄

AOP(Aspect Orientied Programming) 처리

- 유효성 검사 AOP 처리

com.cos.photogramstart.handler.aop.ValidationAdvice.java

```java
package com.cos.photogramstart.handler.aop;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

@Component // RestController, Service 모든 것들이 Component를 상속해서 만들어져 있음.
@Aspect
public class ValidationAdvice {

	@Around("execution(* com.cos.photogramstart.web.api.*Controller.*(..))")
	public Object apiAdvice(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
		
		System.out.println("web api 컨트롤러====================");
		// proceedingJoinPoint => profile 함수의 모든 곳에 접근할 수 있는 변수
		// profile 함수보다 먼저 실행
		
		return proceedingJoinPoint.proceed(); // profile 함수가 실행됨.
	}
	
	@Around("execution(* com.cos.photogramstart.web.*Controller.*(..))")
	public Object advice(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
		
		System.out.println("web 컨트롤러==================");
		
		return proceedingJoinPoint.proceed();		
		
	}
}
```

### 82. 유효성검사 자동화-AOP처리 2탄

ValidationAdvice.java

```java
package com.cos.photogramstart.handler.aop;

import java.util.HashMap;
import java.util.Map;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;

import com.cos.photogramstart.handler.ex.CustomValidationApiException;
import com.cos.photogramstart.handler.ex.CustomValidationException;

@Component // RestController, Service 모든 것들이 Component를 상속해서 만들어져 있음.
@Aspect
public class ValidationAdvice {

	@Around("execution(* com.cos.photogramstart.web.api.*Controller.*(..))")
	public Object apiAdvice(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

		// System.out.println("web api 컨트롤러====================");
		Object[] args = proceedingJoinPoint.getArgs();
		for (Object arg : args) {
			if (arg instanceof BindingResult) {
				// System.out.println("유효성 하는 함수입니다.");
				BindingResult bindingResult = (BindingResult) arg;

				if (bindingResult.hasErrors()) {
					Map<String, String> errorMap = new HashMap<>();

					for (FieldError error : bindingResult.getFieldErrors()) {
						errorMap.put(error.getField(), error.getDefaultMessage());
						// System.out.println(error.getDefaultMessage());
					}
					throw new CustomValidationApiException("유효성 검사 실패함", errorMap);
				}
			}
		}
		// proceedingJoinPoint => profile 함수의 모든 곳에 접근할 수 있는 변수
		// profile 함수보다 먼저 실행

		return proceedingJoinPoint.proceed(); // profile 함수가 실행됨.
	}

	@Around("execution(* com.cos.photogramstart.web.*Controller.*(..))")
	public Object advice(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

		// System.out.println("web 컨트롤러==================");
		Object[] args = proceedingJoinPoint.getArgs();
		for (Object arg : args) {
			if (arg instanceof BindingResult) {
				// System.out.println("유효성 하는 함수입니다.");
				BindingResult bindingResult = (BindingResult) arg;

				if (bindingResult.hasErrors()) {
					Map<String, String> errorMap = new HashMap<>();

					for (FieldError error : bindingResult.getFieldErrors()) {
						errorMap.put(error.getField(), error.getDefaultMessage());
						// System.out.println(error.getDefaultMessage());
					}
					throw new CustomValidationException("유효성 검사 실패함", errorMap);
				}
			}
		}
		return proceedingJoinPoint.proceed();

	}
}
```

controller랑 apiController 유효성 검사 삭제