<이공계기술전문연수> Spring 결합도 / beanTest / 어노테이션

@ 어노테이션방식

-> 대부분 프레임워크는 XML설정이 매우 중요

-> XML설정 과도하게 설정되면 내용이 많아지고 부담스러워짐
-> 대부분프레임워크가 XML방식외에 어노테이션 방식을 지원


@ 의존성 주입 설정

## @Autowired ##

-> 주로 변수 위에 설정하여 해당 타입의 객체를 찾아서 자동으로 할당

## @Qualifier ##

-> 특정 객체의 이름을 이용해서 의존성을 주입 할 때 사용

## @Inject ##

-> @Autowired와 동일한 기능
-> @Autowired는 스프링 전용, Inject는 자바 전용

## @Resource ##

-> @Autowired 와 @Qualifier의 기능을 결합한 어노테이션


@추가어노테이션

-> Controller, Service, Dao를 new 를 통하여 객체를 만들었고,
매번 요청마다 new를 통해 객체를 만들어 리소스 낭비가 심함

-> 어노테이션을 사용하면 객체를 매번 만들 필요가 없음

-> @Component를 통해서 객체를 생성하는데 역할 구분을 위해 다른이름의
어노테이션이 존재

@Controller
-> 사용자 요청을 제어하는 Controller 클래스

@Service
-> 비지니스 로직을 처리하는 Service 클래스

@Repository
-> 데이터 베이스 연동을 처리하는 DAO 클래스

 

 

 

 

 

1. src ->main -> webapp  index.jsp 만듬!

 

 

 

 

2. src -> main -> webapp -> WEB-INF web.xml

 

web.xml 파일에 하나씩 등록해준다.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring/root-context.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <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
      classpath:applicationContext3.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>
  <servlet>
    <description></description>
    <display-name>Dependency</display-name>
    <servlet-name>Dependency</servlet-name>
    <servlet-class>org.kh.spring.controller.DependencyServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Dependency</servlet-name>
    <url-pattern>/dependency</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>Dependency2</display-name>
    <servlet-name>Dependency2</servlet-name>
    <servlet-class>org.kh.person.controller.Dependency2Servlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Dependency2</servlet-name>
    <url-pattern>/dependency2</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>BeanTest</display-name>
    <servlet-name>BeanTest</servlet-name>
    <servlet-class>org.kh.bean.test.BeanTestServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>BeanTest</servlet-name>
    <url-pattern>/beanTest</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>BeanTest2</display-name>
    <servlet-name>BeanTest2</servlet-name>
    <servlet-class>org.kh.bean.test.BeanTestServlet2</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>BeanTest2</servlet-name>
    <url-pattern>/beanTest2</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>BeanTest3</display-name>
    <servlet-name>BeanTest3</servlet-name>
    <servlet-class>org.kh.bean.test.BeanTestServlet3</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>BeanTest3</servlet-name>
    <url-pattern>/beanTest3</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>BeanTest4</display-name>
    <servlet-name>BeanTest4</servlet-name>
    <servlet-class>org.kh.bean.test.BeanTestServlet4</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>BeanTest4</servlet-name>
    <url-pattern>/beanTest4</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>BeanTest5</display-name>
    <servlet-name>BeanTest5</servlet-name>
    <servlet-class>org.kh.bean.test.BeanTestServlet5</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>BeanTest5</servlet-name>
    <url-pattern>/beanTest5</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>AnoTest</display-name>
    <servlet-name>AnoTest</servlet-name>
    <servlet-class>org.kh.test.ano.AnoTestServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>AnoTest</servlet-name>
    <url-pattern>/anoTest</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>Computer</display-name>
    <servlet-name>Computer</servlet-name>
    <servlet-class>org.kh.test.ano.ComputerServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Computer</servlet-name>
    <url-pattern>/computer</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>Computer2</display-name>
    <servlet-name>Computer2</servlet-name>
    <servlet-class>org.kh.exam.Computer2Servlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Computer2</servlet-name>
    <url-pattern>/Computer2</url-pattern>
  </servlet-mapping>
</web-app>