获取Spring上下文

ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(ServletActionContext.getServletContext());
//获取所有Spring中的所有bean
String [] names = ctx.getBeanDefinitionNames();
for(int i=0;i<names.length;i++){
System.out.println("上下文实例："+names[i]);
}
//根据名称获取单个bean
LoginAction action=(LoginAction)ctx.getBean("action");

ApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getSession().getServletContext());