1.通过ServletActionContext获取Servlet api方式
2.获取HttpServletRequest
request = ServletActionContext.getRequest();
3.获取HttpServletResponse
response = ServletActionContext.getResponse();
4.获取HttpSession
httpSession = ServletActionContext.getRequest().getSession();
5.获取ServletContext
servletContext = ServletActionContext.getServletContext();
6.获取Map<String,Object> session
session = ServletActionContext.getContext().getSession();
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