spring-mvc 退出清除session，返回首页，获取当前项目路径，返回前台ajax输出

@RequestMapping(value="/logout",method=RequestMethod.GET)

       public void logout(HttpServletRequest request,HttpServletResponse response)

       {

           //清除session

        Enumeration<String> em = request.getSession().getAttributeNames();

        while(em.hasMoreElements()){

            request.getSession().removeAttribute(em.nextElement().toString());

        }

        request.getSession().invalidate();

        //获取项目真实路径 

           String path = request.getContextPath();

          //拼接跳转页面路径

           String basePath = request.getScheme() + "://"

                  + request.getServerName() + ":" + request.getServerPort()

                  + path + "/";

          //刷新页面

        String str = "<script>top.location='"+basePath+"'</script>";

        System.out.println(str);

        responseTxt(response,str); 

       }

 

//返回前台页面ajax

protected void responseTxt(HttpServletResponse response,String str){

        try {

            response.setContentType("text/html;charset=UTF-8");

            PrintWriter out = response.getWriter();

            out.write(str);

            out.flush();

            out.close();

        } catch (Exception e) {

            e.printStackTrace();

        }        

    }