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1、使用 Filter 过滤器拦截/pages/manager/所有内容，实 现权限检查

Filter 代码：

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
       HttpServletRequest httpServletRequest = (HttpServletRequest) request;    User user = (User) httpServletRequest.getSession().getAttribute("user");    if(user == null){
           httpServletRequest.getRequestDispatcher("/pages/user/login.jsp").forward(request,response);    }else{
           chain.doFilter(request,response);    }}

web.xml 中的配置：

       
           
    
     ManagerFilter
            
    
     loey.filter.ManagerFilter
        
       
           
    
     ManagerFilter
            
    
     /pages/manager/*
            
    
     /manager/bookServlet
        
   

index.jsp；

后台管理$("#filter").click(function () {
   	if(${
   empty sessionScope.user}){
   		alert("你还未登录无法进行后台管理操作，请先登录~");	}});

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