spring为ApplicationContext提供有三种实现

 spring为ApplicationContext提供的3种实现分别为：ClassPathXmlApplicationContext， FileSystemXmlApplicationContext和XmlWebApplicationContext，其中 XmlWebApplicationContext是专为Web工程定制的。使用举例如下： 
   1. FileSystemXmlApplicationContext

eg2.
String[] locations = {"bean1.xml", "bean2.xml", "bean3.xml"};
ApplicationContext ctx = new FileSystemXmlApplicationContext(locations ); //加载多个配置文件

eg3.    
ApplicationContext ctx =new FileSystemXmlApplicationContext("D:roject/bean.xml");//根据具体路径加载文件

　2. ClassPathXmlApplicationContext　

 eg1.  
ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");

 eg2.
String[] locations = {"bean1.xml", "bean2.xml", "bean3.xml"};
ApplicationContext ctx = new ClassPathXmlApplication(locations);
注：其中FileSystemXmlApplicationContext和ClassPathXmlApplicationContext与BeanFactory的xml文件定位方式一样是基于路径的。

3. XmlWebApplicationContext 

eg1.
ServletContext servletContext = request.getSession().getServletContext();    
ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(servletContext);

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