spring ApplicationContextAware_have been waiting for applicationcontext to be set-优快云博客

本文介绍如何在Spring框架中通过实现ApplicationContextAware接口来自动注入ApplicationContext上下文，并展示了如何使用该上下文获取其他Bean实例。

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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");
}

/**
* 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
*/
public static <T> T getBean(String name) {
return (T) context.getBean(name);
}

}

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("u