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
     

 eg1.
ApplicationContext ctx = new FileSystemXmlApplicationContext("bean.xml"); //加载单个配置文件

     

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