spring为ApplicationContext提供有三种实现（举例）

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 ); //加载单个配置文件        eg3.         ApplicationContext ctx =new FileSystemXmlApplicationContext("D:/project/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);