ClassPathxmlapplicationContext:類路徑加載 FileSystemXmlApplicationContext:文件系統(tǒng)路徑加載 AnnotationConfigApplicationContext:用于基于注解的配置 WebApplicationContext:專門(mén)為web應(yīng)用準(zhǔn)備的，從相對(duì)于Web根目錄的路徑中裝載配置文件完成初始化。
ApplicationContext ac = new ClassPathXmlApplicationContext("com/zzm/context/beans.xml");//等同路徑:"classpath:com/zzm/context/beans.xml"ac.getBean("abc",abc.calss);//就可以獲得bean了ApplicationContext ac = new FileSystemXmlApplicationContext("com/zzm/context/beans.xml");//等同路徑:"file:com/zzm/context/beans.xml"ac.getBean("abc",abc.calss);//就可以獲得bean了加載多個(gè)配置文件：
ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]{"conf/beans1.xml","conf.beans2.xml"});對(duì)于基于注解的，如：
@Conigurationpublic class Beans{ @Bean(name="man") public Man newMan(){ Man man = new Man(); man.setName("小明"); }｝用
ApplicationContext ac = new AnnotationConfigApplicationContext(Beans.class);Man man = ac.getBean("man",Man.class);WebApplicationContext初始化需要ServletContext事例，即必須先有Web容器才能完成啟動(dòng)工作，可在web.xml中配置自啟動(dòng)Servlet或定義Web容器監(jiān)聽(tīng)器(ServletContextListener)。
通過(guò)Web容器監(jiān)聽(tīng)器：
web.xml:<!--指定配置文件--><context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/zzm-service.xml</param-value> <!--也可以類路徑：classpath:com/zzm/service.xml 可指定多個(gè)用,隔開(kāi)--></context-param><!--聲明Web容器監(jiān)聽(tīng)--><listener> <listener-class>org.sPRingframework.web.context.ContextLoaderListener</listener-class></listener>通過(guò)自啟動(dòng)的Servlet引導(dǎo)
<!--指定配置文件--><context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/zzm-service.xml</param-value></context-param><!--聲明自啟動(dòng)的Servlet容器><servlet> <servlet-name>sprinfContextLoaderServlet</servlet-name> <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class> <load-on-startup>1</load-on-startup></servlet>WebApplicationContext Spring提供WebApplicationContextUtils通過(guò)該類的getWebApplicationContext(ServletContext sc)方法獲取，即可從ServletContext中獲取WebApplicationContext。 新增3作用域：request，session，global session 像Spring中用過(guò)濾器Filter，如過(guò)濾器中需要加載配置時(shí)可用WebApplicationContext來(lái)加載
public class ACLFilter implements Filter{private ServletContext sc;private ApplicationContext ctx;private UserService userService;/** * 過(guò)濾器初始化 */public void init(FilterConfig cfg) throws ServletException { sc= cfg.getServletContext();//獲取Spring容器 ctx=WebApplicationContextUtils.getWebApplicationContext(sc);//從容器中獲取 UserService 對(duì)象 userService=ctx.getBean("userService",UserService.class);}public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain)throws IOException, ServletException { /**/ chain.doFilter(request, response); }public void destroy() {}}
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