1.jstl标签c:remove删除session request.getSession().setAttribute("ssmsg", "修改成功");
     

 

2.jstl标签choose说明

                     
                          
       预览                
                      
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3.动态获取request当前工程路径

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";//            activity.setAccessUrl( SysConf.APP_SERVER_ADDR + "activity/look/" );            activity.setAccessUrl( basePath + "activity/look/" );