[Spring] AOP: 어노테이션 방식

🌿Spring AOP

---

[Spring] 관점 지향 프로그래밍 AOP: Aspect Oriented Programming

AOP는 주 업무가 들어있는 파일에 보조 업무를 구현하지 않는다. 즉, 주 업무와 보조 업무를 분리하는 작업을 하며, 추후 주 업무 보조 업무가 동시(before, after 등의 특정 시점)에 실행되도록 한다.

이전에는 AOP를 콘솔과 XML 방식으로 사용했지만, 이번에는 AOP를 어노테이션 방식으로 사용하도록 한다.

글쓰기, 수정하기, 삭제하기 권한 체크와 방문기록이 대표적인 AOP의 업무이다.

 

aop:aspectj-autoproxy

<aop:aspectj-autoproxy />

이 태그 하나만 있으면 AOP를 어노테이션 방식으로 사용할 수 있게 된다.

 

기본 설정

servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:beans="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd
		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">

	<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
	
	<!-- Enables the Spring MVC @Controller programming model -->
	<annotation-driven />

	<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
	<resources mapping="/resources/**" location="/resources/" />

	<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
	<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<beans:property name="prefix" value="/WEB-INF/views/" />
		<beans:property name="suffix" value=".jsp" />
	</beans:bean>
	
	<context:component-scan base-package="com.test.aop" />
	<context:component-scan base-package="com.test.controller" />
	<context:component-scan base-package="com.test.persistence" />
	
	<aop:aspectj-autoproxy />
	
</beans:beans>

Namespaces에서 aop를 태그를 1개 추가해 주어야 한다.

 

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.test</groupId>
	<artifactId>aop</artifactId>
	<name>AOPTest</name>
	<packaging>war</packaging>
	<version>1.0.0-BUILD-SNAPSHOT</version>
	<properties>
		<java-version>11</java-version>
		<org.springframework-version>5.0.7.RELEASE</org.springframework-version>
		<org.aspectj-version>1.6.10</org.aspectj-version>
		<org.slf4j-version>1.6.6</org.slf4j-version>
	</properties>
	<dependencies>
		<!-- Spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${org.springframework-version}</version>
			<exclusions>
				<!-- Exclude Commons Logging in favor of SLF4j -->
				<exclusion>
					<groupId>commons-logging</groupId>
					<artifactId>commons-logging</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${org.springframework-version}</version>
		</dependency>

		<!-- AspectJ -->
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjrt</artifactId>
			<version>${org.aspectj-version}</version>
		</dependency>

		<!-- Logging -->
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>${org.slf4j-version}</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>jcl-over-slf4j</artifactId>
			<version>${org.slf4j-version}</version>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>${org.slf4j-version}</version>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>

		<!-- @Inject -->
		<dependency>
			<groupId>javax.inject</groupId>
			<artifactId>javax.inject</artifactId>
			<version>1</version>
		</dependency>

		<!-- Servlet / JSP -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>javax.servlet.jsp-api</artifactId>
			<version>2.3.3</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>

		<!-- Test -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>

		<!-- Lombok -->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<version>1.18.28</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${org.springframework-version}</version>
		</dependency>

		<!-- AOP -->
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjrt</artifactId>
			<version>${org.aspectj-version}</version>
		</dependency>

		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>${org.aspectj-version}</version>
		</dependency>

		<!-- JSON -->
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.15.0</version>
		</dependency>

		<dependency>
			<groupId>com.fasterxml.jackson.dataformat</groupId>
			<artifactId>jackson-dataformat-xml</artifactId>
			<version>2.15.0</version>
		</dependency>

		<dependency>
			<groupId>com.google.code.gson</groupId>
			<artifactId>gson</artifactId>
			<version>2.10.1</version>
		</dependency>

	</dependencies>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <additionalProjectnatures>
                        <projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>
                    </additionalProjectnatures>
                    <additionalBuildcommands>
                        <buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>
                    </additionalBuildcommands>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>true</downloadJavadocs>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.5.1</version>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                    <compilerArgument>-Xlint:all</compilerArgument>
                    <showWarnings>true</showWarnings>
                    <showDeprecation>true</showDeprecation>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>1.2.1</version>
                <configuration>
                    <mainClass>org.test.int1.Main</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

pom.xml에서 의존성 2개를 추가해 주었다.

 

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

	<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/spring/root-context.xml</param-value>
	</context-param>

	<!-- Creates the Spring Container shared by all Servlets and Filters -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- Processes application requests -->
	<servlet>
		<servlet-name>appServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>appServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<filter>
		<filter-name>encodingFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encodingFilter</filter-name>
		<servlet-name>appServlet</servlet-name>
	</filter-mapping>

</web-app>

한글 깨짐 방지를 위해 web.xml을 수정한다.

 

파일 생성

com.test.controller

• AOPController.java

com.test.persistence

• AOPDAO.java (I)
• AOPDAOImpl.java (C)

com.test.aspect

• Log.java

views

• list.jsp
• add.jsp
• view.jsp

 

🌿전체 코드

---

AOPController.java

package com.test.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import com.test.persistence.AOPDAO;

@Controller
public class AOPController {

	@Autowired
	private AOPDAO dao;

	//주 업무 구현
	//목록보기
	@GetMapping(value = "/list.do")
	public String list(Model model) {

		//List<DTO> list = dao.list();
		
		dao.list();
		System.out.println("Controller.list()");
		
		return "list";
	}
	
	@GetMapping(value = "/add.do")
	public String add(Model model) {

		dao.add();
		System.out.println("Controller.add()");
		
		return "add";
	}
	
	@GetMapping(value = "/view.do")
	public String view(Model model) {

		dao.view();
		System.out.println("Controller.view()");
		
		return "view";
	}
	
}

원래였다면 DTO를 받는 식으로 작업했겠지만, 바로 메서드를 만드는 걸로 생략한다.

 

AOPDAO.java (I)

package com.test.persistence;

public interface AOPDAO {

	void list();

	void add();

	void view();

}

 

AOPDAOImpl.java (C)

package com.test.persistence;

import org.springframework.stereotype.Repository;

@Repository
public class AOPDAOImpl implements AOPDAO {

	@Override
	public void list() {

		System.out.println("DAO.list()");
		
	}
	
	@Override
	public void add() {

		System.out.println("DAO.add()");
		
	}
	
	@Override
	public void view() {

		System.out.println("DAO.view()");
		
	}
	
}

 

Log.java

package com.test.aspect;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Component
@Aspect //보조 업무 객체
public class Log {

	//포인트컷 (주 업무)
	@Pointcut("execution(* com.test.controller.AOPController.add(..))")
	public void pc1() {
		//구현부 없음
		//execution을 쓰려고 만든 메서드이기 때문에 구현부를 작성하지 않는다.
	}
	
	//보조 업무
	@After("pc1()") //연결
	public void m1() {
		System.out.println("After [보조업무] 기록을 남깁니다.");
	}

	//보조 업무
	@Before("pc1()") //연결
	public void m2() {
		System.out.println("Before [보조업무] 기록을 남깁니다.");
	}
	
	@After("execution(* com.test.controller.AOPController.list(..))")
	public void m3() {
		System.out.println("After [보조업무] 기록을 남깁니다.");
	}
	
}

@Aspect를 붙이는 순간 보조 업무 객체가 된다.

파일에 s가 붙지 않는다면 Spring bean으로 만들지 않으므로 Spring이 관리하지 않는다는 의미이다. 그래서 @Component를 추가로 붙여 Spring이 관리하도록 해야 한다.

포인트컷은 주 업무 메서드를 의미한다. 이를 AspectJ 표현식으로 나타냈었다. 이를 어노테이션으로 나타내게 된다.

어노테이션 방식을 사용하면 XML을 사용하는 방식에 비해 할 일이 없다.

 

list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<link rel="stylesheet" href="https://me2.do/5BvBFJ57">
<style>

</style>
</head>
<body>
	<!-- list.jsp -->
	<h1>목록보기</h1>
	
	<div>
		<button type="button" onclick="location.href='/aop/list.do';">목록보기</button>
		<button type="button" onclick="location.href='/aop/add.do';">등록하기</button>
		<button type="button" onclick="location.href='/aop/view.do';">상세보기</button>
	</div>
	
	<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
	<script>
	
	</script>
</body>
</html>

 

add.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<link rel="stylesheet" href="https://me2.do/5BvBFJ57">
<style>

</style>
</head>
<body>
	<!-- add.jsp -->
	<h1>상세보기</h1>
	
	<div>
		<button type="button" onclick="location.href='/aop/list.do';">목록보기</button>
		<button type="button" onclick="location.href='/aop/add.do';">등록하기</button>
		<button type="button" onclick="location.href='/aop/view.do';">상세보기</button>
	</div>
	
	<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
	<script>
	
	</script>
</body>
</html>

 

view.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<link rel="stylesheet" href="https://me2.do/5BvBFJ57">
<style>

</style>
</head>
<body>
	<!-- view.jsp -->
	<h1>목록보기</h1>
	
	<div>
		<button type="button" onclick="location.href='/aop/list.do';">목록보기</button>
		<button type="button" onclick="location.href='/aop/add.do';">등록하기</button>
		<button type="button" onclick="location.href='/aop/view.do';">상세보기</button>
	</div>
	
	<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
	<script>
	
	</script>
</body>
</html>