struts2-解耦方式获取Servlet API

2.获取HttpServletRequest
    实现:ServletRequestAware借口
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }
3.获取HttpServletResponse
    实现:ServletResponseAware
    public void setServletResponse(HttpServletResponse response) {
        this.response = response;
    }
4.获取HttpSession
    httpSession = ServletActionContext.getRequest().getSession();
5.获取ServletContext
    实现:ServletContextAware
    public void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }
6.获取Map<String,Object> session
    实现:SessionAware
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }

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