스프링 IOC 컨테이너에서 BEAN 추출

• ApplicationContext 종류

  • ClassPathXmlApplicationContext
  • FileSystemXmlApplicationContext
  • XmlWebApplicationContext
  • AnnotationConfigApplicationContext

• ApplicationContext 생성하기
  ApplicationContext context = new ClassPathXmlApplicationContext("config.xml");

• 스프링 IOC 컨테이너에 적재되어 있는 BEAN 추출 스프링 3.xx 버전대 이전까지.

ApplicationContext applicationcontext = new ClassPathXmlApplicationContext("beans/eims.xml"); 
NjfcIoLayoutRepository bb = applicationcontext.getBean(NjfcIoLayoutRepository.class);
List<Map<String, Object>> list = bb.select(new HashMap());

• 스프링 부트 환경에서 추출

  • ApplicationContextProvider

    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
  
    @Component
    public class ApplicationContextProvider implements ApplicationContextAware {
  
        private static ApplicationContext applicationContext;
  
        @Override
        public void setApplicationContext(ApplicationContext ctx) throws BeansException {
            applicationContext = ctx;
        }
  
        public static ApplicationContext getApplicationContext() {
            return applicationContext;
        }
  
    }

  • DynamicBean

      import java.lang.reflect.InvocationTargetException;
      import java.lang.reflect.Method;
  
      import org.springframework.context.ApplicationContext;
  
      public class DynamicBean { 
          public void dynamic_invoke() throws NoSuchMethodException, SecurityException, ClassNotFoundException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
              String param1="", param2="", param3="";
  
              //1.스프링 IOC 컨테이너에 적재 되어 있는 Bean 추출을 위해 ApplicationContext를 생성. 
              ApplicationContext applicationContext = 
                      ApplicationContextProvider.getApplicationContext();
  
              //2.Class Full package 문자열로 Class 생성. (확장자 제외)
              Class clazz = Class.forName("org.example.springboot.web.Hello");		
  
              //3.컨테이너에서 clazz Type으로 Bean 추출.
              Object service = applicationContext.getBean(clazz);
  
              //4.메소드 생성 
              Method method = clazz.getMethod("afterAppr", String.class, String.class, String.class);
  
              //5.메소드 실행.
              method.invoke(service, param1, param2, param3);			
  
          }
  
      }