spring contextlistener web context

	
	

	

		
		
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class ContextListener extends ContextLoaderListener implements ApplicationContextAware {

    private static final Logger log = LoggerFactory.getLogger(ContextListener.class);
    private static final String ATTR_NAME = "org.springframework.web.servlet.FrameworkServlet.CONTEXT.dispatcherServlet";

    private static ApplicationContext applicationContext;
    private static WebApplicationContext webApplicationContext;

    public static <T> T getBean(Class<T> tClass) {
        if (webApplicationContext == null) {
            webApplicationContext = (WebApplicationContext) getCurrentWebApplicationContext()
  .getServletContext().getAttribute(ATTR_NAME);
        }
        if (webApplicationContext != null) {
            T bean = webApplicationContext.getBean(tClass);
            if (bean != null) {
                return bean;
            }
        }
        if (applicationContext != null) {
            return applicationContext.getBean(tClass);
        }
        return null;
    }


    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        ContextListener.applicationContext = applicationContext;
    }
}