java如何获取spring上下文ApplicationContext？
解决方法：
public static ApplicationContext getRequiredWebApplicationContext() {
ServletRequestAttributes attributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
if (attributes == null) {
throw new RuntimeException("非web请求，非法调用！");
} else {
HttpServletRequest request = attributes.getRequest();
ApplicationContext ac = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getServletContext());
return ac;
}
}