Web开发中获取Spring的ApplicationContext的几种形式

Web开发中获取Spring的ApplicationContext的几种方式

在 WEB 开发中，获取到由 Spring 进行管理的某些 Bean，通常采用下面方式来获取

1、通过set注入方式

  
当对serviceLocator实例时就自动设置BeanFactory,以便后来可直接用 beanFactory 
  
当对SpringContextUtil 实例时就自动设置applicationContext,以便后来可直接用applicationContext 
  public class SpringContext  {     private static ApplicationContext applicationContext;     //Spring应用上下文环境           */     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {       SpringContextUtil.applicationContext = applicationContext;     }         /**    * @return ApplicationContext    */    public static ApplicationContext getApplicationContext() {       return applicationContext;     }           */     public static Object getBean(String name) throws BeansException {       return applicationContext.getBean(name);     }     }     public class SpringContextLoaderListener extends ContextLoaderListener{  //    public void contextInitialized(ServletContextEvent event) {       super.contextInitialized(event);     SpringContext.setApplicationContext(       WebApplicationContextUtils.getWebApplicationContext(event.getServletContext())       );    }   }     public class SpringContextLoaderServlet extends ContextLoaderServlet {    private ContextLoader contextLoader;       public void init() throws ServletException {           this.contextLoader = createContextLoader();           SpringContext.setApplicationContext(this.contextLoader.initWebApplicationContext(getServletContext()));       }   }