通过ApplicationContextAware获取bean .

加载Spring配置文件时，如果Spring配置文件中所定义的Bean类实现了ApplicationContextAware 接口，那么在加载Spring配置文件时，会自动调用ApplicationContextAware 接口中的

public void setApplicationContext(ApplicationContext context) throws BeansException

方法，获得ApplicationContext对象。

前提必须在Spring配置文件中指定该类

 

public class ApplicationContextRegister implements ApplicationContextAware {

 private Log log = LogFactory.getLog(getClass());
 
 public void setApplicationContext(ApplicationContext applicationContext)
   throws BeansException {
  ContextUtils.setApplicationContext(applicationContext);
  log.debug("ApplicationContext registed");
 }

}

 

public class ContextUtils {
 
 private static ApplicationContext applicationContext;
 
 private static Log log = LogFactory.getLog(ContextUtils.class);

 public static void setApplicationContext(ApplicationContext applicationContext) {
  synchronized (ContextUtils.class) {
   log.debug("setApplicationContext, notifyAll");
   ContextUtils.applicationContext = applicationContext;
   ContextUtils.class.notifyAll();
  }
 }
 
 public static ApplicationContext getApplicationContext() {
  synchronized (ContextUtils.class) {
   while (applicationContext == null) {
    try {
     log.debug("getApplicationContext, wait...");
     ContextUtils.class.wait(60000);
     if (applicationContext == null) {
      log.warn("Have been waiting for ApplicationContext to be set for 1 minute", new Exception());
     }
    } catch (InterruptedException ex) {
     log.debug("getApplicationContext, wait interrupted");
    }
   }
   return applicationContext;
  }
 }

 public static Object getBean(String name) {
  return getApplicationContext().getBean(name);
 }

}

配置文件:<bean class="com.sinotrans.framework.core.support.ApplicationContextRegister" />

 

正常情况:

public class AppManager extends ContextLoaderListener implements  ServletContextListener {

    private ServletContext context;
    private WebApplicationContext webApplicationContext;

    public void contextInitialized(ServletContextEvent sce) {
        this.context = sce.getServletContext();
        this.webApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(context);
        this.context.setAttribute("WEBAPPLICATIONCONTEXT", webApplicationContext);       ｝

HttpSession session = request.getSession();
WebApplicationContext webApplicationContext = (WebApplicationContext)session.getServletContext().getAttribute("WEBAPPLICATIONCONTEXT");
UnsubscribeEmailFacade unsubscribeEmailFacade = (UnsubscribeEmailFacade)webApplicationContext.getBean("unsubscribeEmailFacade");