一、servlet过滤器

@WebServlet("/demo01.do")
public class Demo01Servlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("hello");
        request.getRequestDispatcher("cc.html").forward(request,response);
    }
}

@WebFilter("/demo01.do")
public class Demo01Filter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("helloA1");
        //放行
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("helloA2");
    }
    @Override
    public void destroy() {

    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>hello</h1>
</body>
</html>

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