@Autowired

@Autowired

  -의존관계 자동 설정(type 기반)

  -생성자, 필드, 메서드에 적용 가능

  -setXXXX()의 형식이 아니어도 적용가능

 

AbstractController.java

package controller; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.servlet.ModelAndView; import service.AbstractService; public class AbstractController extends   org.springframework.web.servlet.mvc.AbstractController {    @Autowired  private AbstractService service;    //@Autowired  //public void prepare(AbstractService service){  // this.service = service;  //}    @Override  protected ModelAndView handleRequestInternal(HttpServletRequest arg0,    HttpServletResponse arg1) throws Exception {   // TODO Auto-generated method stub      System.out.println("START >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");   System.out.println(service.getClassName());   System.out.println("END >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");      return null;  } }

 

AbstractService.java

package service; public interface AbstractService {  String getClassName(); }

 

AbstractServiceImpl.java 

package service; public class AbstractServiceImpl implements AbstractService {  @Override  public String getClassName() {   // TODO Auto-generated method stub   return "AbstractServiceImpl";  } }

 

spring301-servlet.xml 

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"  xmlns:context="http://www.springframework.org/schema/context"  xmlns:p="http://www.springframework.org/schema/p"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.0.xsd">  <context:annotation-config/>    <!-- HandlerMapping 설정 -->  <bean id="simpleUrlHandlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">   <property name="mappings">    <props>     <prop key="/abstract.sp">abstractController</prop>    </props>   </property>  </bean>  <!-- ViewResolver 설정 : ResourceBundleViewResolver -->  <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">   <property name="prefix">    <value>WEB-INF/jsp/</value>   </property>   <property name="suffix">    <value>.jsp</value>   </property>   <property name="contentType">    <value>text/html; charset=UTF-8</value>   </property>  </bean>    <!-- 각종 bean 설정 -->  <bean id="abstractController" class="controller.AbstractController"></bean>  <bean id="abstractService" class="service.AbstractServiceImpl"></bean>   </beans>

 

 

▶결과

START >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> AbstractServiceImpl END >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

 

아래와 같이 메서드에 적용도 가능(setXXX() 형태가 아니어도 적용가능!!!)

@Autowired public void prepare(AbstractService service){  this.service = service; }

 

/////////////////////////////////////////////////////////////////////////////////////////////

 

 

@Autowired(required=false)

  -프로퍼티를 반드시 설정할 필요가 없는 경우 사용

  -default : true

 

AbstractController.java

package controller; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.servlet.ModelAndView; import service.AbstractService; public class AbstractController extends   org.springframework.web.servlet.mvc.AbstractController {    @Autowired(required=false)  private AbstractService service;    @Override  protected ModelAndView handleRequestInternal(HttpServletRequest arg0,    HttpServletResponse arg1) throws Exception {   // TODO Auto-generated method stub      System.out.println("START >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");   System.out.println(service.getClassName());   System.out.println("END >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");   return null;  } }

 

spring301-servlet.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"  xmlns:context="http://www.springframework.org/schema/context"  xmlns:p="http://www.springframework.org/schema/p"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.0.xsd">  <context:annotation-config/>    <!-- HandlerMapping 설정 -->  <bean id="simpleUrlHandlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">   <property name="mappings">    <props>     <prop key="/abstract.sp">abstractController</prop>    </props>   </property>  </bean>  <!-- ViewResolver 설정 : ResourceBundleViewResolver -->  <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">   <property name="prefix">    <value>WEB-INF/jsp/</value>   </property>   <property name="suffix">    <value>.jsp</value>   </property>   <property name="contentType">    <value>text/html; charset=UTF-8</value>   </property>  </bean>    <!-- 각종 bean 설정 -->  <bean id="abstractController" class="controller.AbstractController"></bean>  <!-- bean id="abstractService" class="service.AbstractServiceImpl"></bean -->   </beans>

 

-required 속성의 값을 false로 지정할 경우, 해당 타입의 빈 객체가 존재하지 않더라도 예외가 발생하지 않음

(실제 로직 처리시 exception 발생)

-즉 위의 예제의 경우 <!-- bean id="abstractService" class="service.AbstractServiceImpl"></bean -->
처럼 주석 처리가 되어 있지만 @Autowired(required=false)이므로 웹서버가 설정파일 로드시 에러가 발생하지 않음.

required=true로 설정했다면 웹서버가 설정파일 로드시 에러발생

 

 

/////////////////////////////////////////////////////////////////////////////////////////////

 

 

@Qualifier

  -동일한 타입의 빈 객체들 중 특정 빈을 사용하도록 설정

 

package controller; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.web.servlet.ModelAndView; import service.AbstractService; public class AbstractController extends   org.springframework.web.servlet.mvc.AbstractController {    @Autowired  @Qualifier("service")  private AbstractService service;    @Override  protected ModelAndView handleRequestInternal(HttpServletRequest arg0,    HttpServletResponse arg1) throws Exception {   // TODO Auto-generated method stub      System.out.println("START >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");   System.out.println(service.getClassName());   System.out.println("END >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");   return null;  } }     ========================================================================================== //아래처럼 사용해도 문제없음  private AbstractService service;    @Autowired  public void prepare(@Qualifier("service") AbstractService service){   this.service = service;  }

 

 

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"  xmlns:context="http://www.springframework.org/schema/context"  xmlns:p="http://www.springframework.org/schema/p"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.0.xsd">  <context:annotation-config/>    <!-- HandlerMapping 설정 -->  <bean id="simpleUrlHandlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">   <property name="mappings">    <props>     <prop key="/abstract.sp">abstractController</prop>    </props>   </property>  </bean>  <!-- ViewResolver 설정 : ResourceBundleViewResolver -->  <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">   <property name="prefix">    <value>WEB-INF/jsp/</value>   </property>   <property name="suffix">    <value>.jsp</value>   </property>   <property name="contentType">    <value>text/html; charset=UTF-8</value>   </property>  </bean>    <!-- 각종 bean 설정 -->  <bean id="abstractController" class="controller.AbstractController"></bean>    <bean id="abstractService" class="service.AbstractServiceImpl">   <qualifier value="service"></qualifier>  </bean>   </beans>