获取applicationContext的几个类

1, ApplicationContext ac = new FileSystemXmlApplicationContex("src/ applicationContext.xml"); //

2, WebApplicationContext ctx = null;
    if (ctx == null) 
    { 
    ctx = WebApplicationContextUtils 
    .getRequiredWebApplicationContext(this.getServletContext());
    
    } 

3, ApplicationContext ac = new ... ClassPathXmlApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml"); 

4, WebApplicationContext wac = (WebApplicationContext)servletContext.

　　getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);