filter--a URL-level role certification for a directory---learning notes

Source: Internet
Author: User

login.html Login
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
Fiter processing
Import Java.io.ioexception;import Javax.servlet.filter;import Javax.servlet.filterchain;import Javax.servlet.filterconfig;import Javax.servlet.servletexception;import Javax.servlet.servletrequest;import Javax.servlet.servletresponse;import Javax.servlet.http.httpservletrequest;import javax.servlet.http.httpservletresponse;//authentication of sensitive catalogs [classroom practice 1]public class FilterDemo7 implements Filter {public void init (Filterconfig filterconfig) throws servletexception {} public void DoFilter (ServletRequest req, servletresponse Res        , Filterchain chain) throws IOException, servletexception {httpservletrequest request = (httpservletrequest) req;        HttpServletResponse response = (httpservletresponse) res;        Set the request Body encoding method request.setcharacterencoding ("UTF-8");        Get user request parameter String username = request.getparameter ("username");        String Password = request.getparameter ("password");        String role = Request.getparameter ("role"); Sentence if (username!=null && password!=null && role!=null && username.trim (). Length () >0 && Password.trim () . Length () >0 && Role.trim (). Length () >0) {if ("Normal user". Equals (role)) {Request.setattrib                Ute ("message", "Welcome to ordinary user <font color= ' blue ' >" +username+ "</font> login");            Request.setattribute ("Flag", "user"); }else if ("Administrator". Equals (role)) {Request.setattribute ("message", "Welcome Administrator <font color= ' red ' >" +username+ "<                 /FONT> Login ");            Request.setattribute ("Flag", "admin");        } chain.dofilter (Request,response); }} public void Destroy () {}}
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<%@ page language="java" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
Xml
 <filter>    <filter-name>FilterDemo7</filter-name>    <filter-class>cn.itcast.web.filter.FilterDemo7</filter-class>  </filter>  <filter-mapping>    <filter-name>FilterDemo7</filter-name>    <url-pattern>/welcome.jsp</url-pattern>  </filter-mapping>

filter--a URL-level role certification for a directory---learning notes

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