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package com.imooc.sm.global;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.io.IOException;public class LoginFilter implements Filter {    public void init(FilterConfig filterConfig) throws ServletException {    }    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {        HttpServletRequest request=(HttpServletRequest)servletRequest;        HttpServletResponse response = (HttpServletResponse)servletResponse;        String path = request.getServletPath();        if(path.toLowerCase().indexOf("login")!=-1){            filterChain.doFilter(request,response);        }        else{            HttpSession session = request.getSession();            Object obj =session.getAttribute("USER");            if(obj!=null){                filterChain.doFilter(request,response);            }            else{                response.sendRedirect(request.getContextPath()+"/toLogin.do");            }        }    }    public void destroy() {    }}

     
    
     Login
      
    
     com.imooc.sm.global.LoginFilter
    
   
     
    
     Login
      
    
     *.jsp
    
   
     
    
     Login
      
    
     *.do
    
   

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