java学习

java学习

 

ApplicationContextAware接口的作用

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:

  1. public class AppManager extends ContextLoaderListener implements  ServletContextListener {  
  2.  
  3.     private ServletContext context;  
  4.     private WebApplicationContext webApplicationContext;  
  5.  
  6.     public void contextInitialized(ServletContextEvent sce) {  
  7.         this.context = sce.getServletContext();  
  8.         this.webApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(context);  
  9.         this.context.setAttribute("WEBAPPLICATIONCONTEXT", webApplicationContext);       } 
  1. HttpSession session = request.getSession();  
  2. WebApplicationContext webApplicationContext = (WebApplicationContext)session.getServletContext().getAttribute("WEBAPPLICATIONCONTEXT");  
  3. UnsubscribeEmailFacade unsubscribeEmailFacade = (UnsubscribeEmailFacade)webApplicationContext.getBean("unsubscribeEmailFacade"); 

posted on 2013-08-23 09:29 杨军威 阅读(35636) 评论(1)  编辑  收藏

评论

# re: ApplicationContextAware接口的作用 2015-08-05 13:45 解决

解决  回复  更多评论   


只有注册用户登录后才能发表评论。


网站导航:
 

导航

统计

常用链接

留言簿

随笔档案

搜索

最新评论

阅读排行榜

评论排行榜