今天设计了首页，设置了过滤器
<%--
Created by IntelliJ IDEA.
User: 张志伟
Date: 2020/10/15
Time: 16:07
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>首页</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="${pageContext.request.contextPath }/bootstrap/css/bootstrap.min.css">
<script src="${pageContext.request.contextPath }/bootstrap/js/jquery-3.5.1.min.js"></script>
<script src="${pageContext.request.contextPath }/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<!--导航栏-->
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">重大需求征集系统 <small>V1.0</small></a>
</div>
<ul class="nav navbar-nav navbar-right">
<li><a href="#"> <span class="text-danger">${sessionScope.user.username}</span> 您好</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">个人中心 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">我的信息</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">修改密码</a></li>
<li role="separator" class="divider"></li>
<li><a href="${pageContext.request.contextPath}/exitServlet">退出登录</a></li>
<li role="separator" class="divider"></li>
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<!--导航栏-->
<!--页面中心内容-->
<div class="container-fluid">
<div class="row">
<!--左半区-->
<div class="col-sm-2">
<!--菜单组件-->
<div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="headingOne">
<h4 class="panel-title">
<a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
用户管理
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse " role="tabpanel" aria-labelledby="headingOne">
<div class="panel-body">
<ul class="list-group">
<a class="list-group-item" href="${pageContext.request.contextPath}/usermangeServlet">用户管理</a>
<a class="list-group-item"href="${pageContext.request.contextPath}/rolemangeServlet">权限管理</a>
</ul>
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="headingTwo">
<h4 class="panel-title">
<a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="true" aria-controls="collapseOne">
需求管理
</a>
</h4>
</div>
<div id="collapseTwo" class="panel-collapse collapse " role="tabpanel" aria-labelledby="headingTwo">
<div class="panel-body">
<ul class="list-group">
<a class="list-group-item" href="">需求征集</a>
<a class="list-group-item" href="">需求管理</a>
</ul>
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="headingThree">
<h4 class="panel-title">
<a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="true" aria-controls="collapseOne">
审核
</a>
</h4>
</div>
<div id="collapseThree" class="panel-collapse collapse " role="tabpanel" aria-labelledby="headingThree">
<div class="panel-body">
<ul class="list-group">
<a class="list-group-item" href="">形式审核</a>
<a class="list-group-item" href="">部门审核</a>
</ul>
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="headingFour">
<h4 class="panel-title">
<a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseFour" aria-expanded="true" aria-controls="collapseOne">
统计查询
</a>
</h4>
</div>
<div id="collapseFour" class="panel-collapse collapse " role="tabpanel" aria-labelledby="headingFour">
<div class="panel-body">
<ul class="list-group">
<a class="list-group-item" href="">分类检索</a>
<a class="list-group-item" href="">综合检索</a>
<a class="list-group-item" href="">统计图表</a>
</ul>
</div>
</div>
</div>
</div>
</div>
<!--左半区-->
<!--中间部分-->
<div id="content">
<!--页面中心内容-->
<div class="col-sm-10">
<!--巨幕-->
<div class="jumbotron">
<h1>欢迎使用需求征集系统</h1>
<p>
为了充分利用京津科技资源，破解我省产业转型升级、绿色崛起所面临的重大技术难题，按照厅领导指示，现面向重点产业、重点领域、
重点企业（单位）征集产业或领域关键技术难题，构建我省重大技术需求数据库，特制定本工作方案。
</p>
</div>
</div>
</div>
<!--中间部分-->
</div>
</div>
<!--页面中心内容-->
</body>
</html>
package web.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
@WebFilter( "/*")
public class LoginFilter implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
//System.out.println(req);
//0.强制转换
HttpServletRequest request = (HttpServletRequest) req;
//1.获取资源请求路径
String uri = request.getRequestURI();
//2.判断是否包含登录相关资源路径,要注意排除掉 css/js/图片/验证码等资源
if(uri.contains("/login.jsp") || uri.contains("/loginServlet") ||uri.contains("/register.jsp") || uri.contains("/registerServlet")|| uri.contains("/bootstrap/")|| uri.contains("/checkCodeServlet") ){
//包含，用户就是想登录。放行
chain.doFilter(req, resp);
}else{
//不包含，需要验证用户是否登录
//3.从获取session中获取user
Object user = request.getSession().getAttribute("user");
if(user != null){
//登录了。放行
chain.doFilter(req, resp);
}else{
//没有登录。跳转登录页面
request.setAttribute("login_msg","您尚未登录，请登录");
request.getRequestDispatcher("/login.jsp").forward(request,resp);
}
}
}
public void init(FilterConfig config) throws ServletException {
}
}