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社区首页 >专栏 >【尚筹网】四、管理员登录

【尚筹网】四、管理员登录

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用户11332765
发布于 2024-11-26 12:10:55
发布于 2024-11-26 12:10:55
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文章被收录于专栏：编程编程

目标

识别操作系统的人的身份，控制它的行为

思路

image-20241124142847454
image-20241124142847454

代码

创建工具方法执行 MD5 加密

代码语言：javascript
复制
/**
	 * 对明文字符串进行 md5 加密
	 * @param source 明文字符串
	 * @return 加密结果
	 */
public static String md5(String source) {
    // 1.判断 source 是否有效
    if (source == null || source.length() == 0) {
        // 2.如果不是有效的字符串抛出异常
        throw new RuntimeException(CrowdConstant.MESSAGE_STRING_INVALIDATE);
    }
    try {
        // 3.获取 MessageDigest 对象
        String algorithm = "md5";

        MessageDigest messageDigest = MessageDigest.getInstance(algorithm);

        // 4.将明文字符串转换为 byte 数组
        byte[] bytes = source.getBytes();

        // 5.调用 MessageDigest 对象的 digest() 方法，完成加密，返回加密后的 byte 数组
        byte[] output = messageDigest.digest(bytes);

        // 6.创建 BigInteger 对象
        int signum = 1;
        BigInteger bigInteger = new BigInteger(signum, output);

        // 7.按照 16 进制将 BigInteger 的值转化为字符串
        int radix = 16;
        String encoded = bigInteger.toString(radix).toUpperCase();
        return encoded;

    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e);
    }
}

创建登录失败异常类

image-20241124143123515
image-20241124143123515
代码语言：javascript
复制
package com.atguigu.crowd.exception;

/**
 * Copyright (C) 2024 - 2024 Jasonakeke， Inc. All Rights Reserved
 *
 * @Desc : 登录失败后抛出的异常
 * @Time : 2024/11/23 22:50
 * @Author : Code_By_Jasonakeke
 * @Email : 2284037977@qq.com
 * @Class : LoginFailedException
 * @IDE : IntelliJ IDEA
 */
public class LoginFailedException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public LoginFailedException() {
       super();
    }

    public LoginFailedException(String message) {
       super(message);
    }

    public LoginFailedException(String message, Throwable cause) {
       super(message, cause);
    }

    public LoginFailedException(Throwable cause) {
       super(cause);
    }

    public LoginFailedException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
       super(message, cause, enableSuppression, writableStackTrace);
    }
}

在异常处理类中增加登录失败异常的处理

image-20241124143341178
image-20241124143341178
代码语言：javascript
复制
@ExceptionHandler(LoginFailedException.class)
public ModelAndView resolveLoginFailedException(
    LoginFailedException  exception,
    HttpServletRequest request,
    HttpServletResponse response) throws IOException {
    String viewName = "admin-login";
    return commonResolve(viewName, exception, request, response);
}

在登录页面显示异常消息

image-20241124144145723
image-20241124144145723
代码语言：javascript
复制
<h2 class="form-signin-heading">
    <i class="glyphicon glyphicon-log-in"></i>
    管理员登录
</h2>
<p>${requestScope.exception.message}</p>

handler 方法

image-20241124145418849
image-20241124145418849
代码语言：javascript
复制
package com.atguigu.crowd.mvc.handler;

import com.atguigu.crowd.constant.CrowdConstant;
import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.service.api.AdminService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpSession;

/**
 * Copyright (C) 2024 - 2024 Jasonakeke， Inc. All Rights Reserved
 *
 * @Desc :
 * @Time : 2024/11/24 14:42
 * @Author : Code_By_Jasonakeke
 * @Email : 2284037977@qq.com
 * @Class : AdminHandler
 * @IDE : IntelliJ IDEA
 */
@Controller
public class AdminHandler {

    @Autowired
    private AdminService adminService;

    @RequestMapping("/admin/do/login.html")
    public String doLogin(
          @RequestParam("loginAcct") String loginAcct,
          @RequestParam("userPswd") String userPswd,
          HttpSession session
    ){
       // 调用Service方法执行登录检查
       // 这个方法如果能返回 Admin 对象说明登录成功，如果账号密码不正确则会抛出异常
       Admin admin = adminService.getAdminByLoginAcct(loginAcct, userPswd);
       // 将登录成功返回的 Admin 对象存入 Session 域
       session.setAttribute(CrowdConstant.ATTR_NAME_LOGIN_ADMIN, admin);
       return "admin-main";
    }
}

service 方法

image-20241124151212175
image-20241124151212175
代码语言：javascript
复制
package com.atguigu.crowd.service.impl;

import com.atguigu.crowd.constant.CrowdConstant;
import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.entity.AdminExample;
import com.atguigu.crowd.exception.LoginFailedException;
import com.atguigu.crowd.mapper.AdminMapper;
import com.atguigu.crowd.service.api.AdminService;
import com.atguigu.crowd.util.CrowdUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Objects;

/**
 * Copyright (C) 2024 - 2024 Jasonakeke， Inc. All Rights Reserved
 *
 * @Desc :
 * @Time : 2024/11/17 21:03
 * @Author : Code_By_Jasonakeke
 * @Email : 2284037977@qq.com
 * @Class : AdminServiceImpl
 * @IDE : IntelliJ IDEA
 */
@Service
public class AdminServiceImpl implements AdminService {

    @Autowired
    private AdminMapper adminMapper;

    @Override
    public Admin getAdminByLoginAcct(String loginAcct, String userPswd) {
       // 1.根据登录账号查询 Admin 对象
       // ①.创建 AdminExample 对象
       AdminExample adminExample = new AdminExample();
       // ②.创建 Criteria 对象
       AdminExample.Criteria criteria = adminExample.createCriteria();
       // ③.将条件封装到 Criteria 对象中
       criteria.andLoginAcctEqualTo(loginAcct);
       // ④.调用 MyBatis 的动态 SQL 底层代码
       List<Admin> lists = adminMapper.selectByExample(adminExample);
       // 2.判断 Admin 对象是否为 null
       if (lists == null || lists.size() == 0) {
          throw new LoginFailedException(CrowdConstant.MESSAGE_LOGIN_FAILED);
       }
       if (lists.size() > 1) {
          throw new RuntimeException(CrowdConstant.MESSAGE_SYSTEM_ERROR_LOGIN_NOT_UNIQUE);
       }
       Admin admin = lists.get(0);
       // 3.如果 Admin 对象为 null，则抛出 LoginFailedException 异常
       if (admin == null) {
          throw new LoginFailedException(CrowdConstant.MESSAGE_LOGIN_FAILED);
       }
       // 4.如果 Admin 对象不为 null，则将 Admin 对象的 userPswd 属性取出
       String userPswdDB = admin.getUserPswd();
       // 5.将表单提交的明文密码 userPswd 进行 Md5 加密
       String userPswdForm = CrowdUtil.md5(userPswd);
       // 6.将加密后的密码与数据库中的密码比较
       if (!Objects.equals(userPswdDB, userPswdForm)) {
          // 7.如果比较结果不一致，则抛出 LoginFailedException 异常
          throw new LoginFailedException(CrowdConstant.MESSAGE_LOGIN_FAILED);
       }
       // 8.如果比较结果一致，则返回 Admin 对象
       return admin;
    }
}

创建登录成功的临时主页面

image-20241124151411780
image-20241124151411780
代码语言：javascript
复制
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
    <head>
       <title>Title</title>
    </head>
    <body>
       <h1>临时主页面</h1>
       ${sessionScope.loginAdmin.userName}
    </body>
</html>

测试

image-20241124221054820
image-20241124221054820
image-20241124221351315
image-20241124221351315

将临时主页面替换为真正的主页面

代码语言：javascript
复制
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
    <head>
       <meta charset="UTF-8">
       <meta http-equiv="X-UA-Compatible" content="IE=edge">
       <meta name="viewport" content="width=device-width, initial-scale=1">
       <meta name="description" content="">
       <meta name="author" content="">
       <base href="http://${pageContext.request.serverName}:${pageContext.request.serverPort}${pageContext.request.contextPath}/" />
       <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
       <link rel="stylesheet" href="css/font-awesome.min.css">
       <link rel="stylesheet" href="css/main.css">
       <script src="jquery/jquery-2.1.1.min.js"></script>
       <script src="bootstrap/js/bootstrap.min.js"></script>
       <script src="script/docs.min.js"></script>
       <script type="text/javascript">
          $(function () {
             $(".list-group-item").click(function(){
                if ( $(this).find("ul") ) {
                   $(this).toggleClass("tree-closed");
                   if ( $(this).hasClass("tree-closed") ) {
                      $("ul", this).hide("fast");
                   } else {
                      $("ul", this).show("fast");
                   }
                }
             });
          });
       </script>
       <style>
          .tree li {
             list-style-type: none;
             cursor:pointer;
          }
          .tree-closed {
             height : 40px;
          }
          .tree-expanded {
             height : auto;
          }
       </style>
    </head>

    <body>

       <nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
          <div class="container-fluid">
             <div class="navbar-header">
                <div><a class="navbar-brand" style="font-size:32px;" href="#">众筹平台 - 控制面板</a></div>
             </div>
             <div id="navbar" class="navbar-collapse collapse">
                <ul class="nav navbar-nav navbar-right">
                   <li style="padding-top:8px;">
                      <div class="btn-group">
                         <button type="button" class="btn btn-default btn-success dropdown-toggle" data-toggle="dropdown">
                            <i class="glyphicon glyphicon-user"></i> ${sessionScope.loginAdmin.userName} <span class="caret"></span>
                         </button>
                         <ul class="dropdown-menu" role="menu">
                            <li><a href="#"><i class="glyphicon glyphicon-cog"></i> 个人设置</a></li>
                            <li><a href="#"><i class="glyphicon glyphicon-comment"></i> 消息</a></li>
                            <li class="divider"></li>
                            <li><a href="index.html"><i class="glyphicon glyphicon-off"></i> 退出系统</a></li>
                         </ul>
                      </div>
                   </li>
                   <li style="margin-left:10px;padding-top:8px;">
                      <button type="button" class="btn btn-default btn-danger">
                         <span class="glyphicon glyphicon-question-sign"></span> 帮助
                      </button>
                   </li>
                </ul>
                <form class="navbar-form navbar-right">
                   <input type="text" class="form-control" placeholder="查询">
                </form>
             </div>
          </div>
       </nav>
       <div class="container-fluid">
          <div class="row">
             <div class="col-sm-3 col-md-2 sidebar">
                <div class="tree">
                   <ul style="padding-left:0px;" class="list-group">
                      <li class="list-group-item tree-closed" >
                         <a href="main.html"><i class="glyphicon glyphicon-dashboard"></i> 控制面板</a>
                      </li>
                      <li class="list-group-item tree-closed">
                         <span><i class="glyphicon glyphicon glyphicon-tasks"></i> 权限管理 <span class="badge" style="float:right">3</span></span>
                         <ul style="margin-top:10px;display:none;">
                            <li style="height:30px;">
                               <a href="user.html"><i class="glyphicon glyphicon-user"></i> 用户维护</a>
                            </li>
                            <li style="height:30px;">
                               <a href="role.html"><i class="glyphicon glyphicon-king"></i> 角色维护</a>
                            </li>
                            <li style="height:30px;">
                               <a href="permission.html"><i class="glyphicon glyphicon-lock"></i> 菜单维护</a>
                            </li>
                         </ul>
                      </li>
                      <li class="list-group-item tree-closed">
                         <span><i class="glyphicon glyphicon-ok"></i> 业务审核 <span class="badge" style="float:right">3</span></span>
                         <ul style="margin-top:10px;display:none;">
                            <li style="height:30px;">
                               <a href="auth_cert.html"><i class="glyphicon glyphicon-check"></i> 实名认证审核</a>
                            </li>
                            <li style="height:30px;">
                               <a href="auth_adv.html"><i class="glyphicon glyphicon-check"></i> 广告审核</a>
                            </li>
                            <li style="height:30px;">
                               <a href="auth_project.html"><i class="glyphicon glyphicon-check"></i> 项目审核</a>
                            </li>
                         </ul>
                      </li>
                      <li class="list-group-item tree-closed">
                         <span><i class="glyphicon glyphicon-th-large"></i> 业务管理 <span class="badge" style="float:right">7</span></span>
                         <ul style="margin-top:10px;display:none;">
                            <li style="height:30px;">
                               <a href="cert.html"><i class="glyphicon glyphicon-picture"></i> 资质维护</a>
                            </li>
                            <li style="height:30px;">
                               <a href="type.html"><i class="glyphicon glyphicon-equalizer"></i> 分类管理</a>
                            </li>
                            <li style="height:30px;">
                               <a href="process.html"><i class="glyphicon glyphicon-random"></i> 流程管理</a>
                            </li>
                            <li style="height:30px;">
                               <a href="advertisement.html"><i class="glyphicon glyphicon-hdd"></i> 广告管理</a>
                            </li>
                            <li style="height:30px;">
                               <a href="message.html"><i class="glyphicon glyphicon-comment"></i> 消息模板</a>
                            </li>
                            <li style="height:30px;">
                               <a href="project_type.html"><i class="glyphicon glyphicon-list"></i> 项目分类</a>
                            </li>
                            <li style="height:30px;">
                               <a href="tag.html"><i class="glyphicon glyphicon-tags"></i> 项目标签</a>
                            </li>
                         </ul>
                      </li>
                      <li class="list-group-item tree-closed" >
                         <a href="param.html"><i class="glyphicon glyphicon-list-alt"></i> 参数管理</a>
                      </li>
                   </ul>
                </div>
             </div>
             <div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">
                <h1 class="page-header">控制面板</h1>

                <div class="row placeholders">
                   <div class="col-xs-6 col-sm-3 placeholder">
                      <img data-src="holder.js/200x200/auto/sky" class="img-responsive" alt="Generic placeholder thumbnail">
                      <h4>Label</h4>
                      <span class="text-muted">Something else</span>
                   </div>
                   <div class="col-xs-6 col-sm-3 placeholder">
                      <img data-src="holder.js/200x200/auto/vine" class="img-responsive" alt="Generic placeholder thumbnail">
                      <h4>Label</h4>
                      <span class="text-muted">Something else</span>
                   </div>
                   <div class="col-xs-6 col-sm-3 placeholder">
                      <img data-src="holder.js/200x200/auto/sky" class="img-responsive" alt="Generic placeholder thumbnail">
                      <h4>Label</h4>
                      <span class="text-muted">Something else</span>
                   </div>
                   <div class="col-xs-6 col-sm-3 placeholder">
                      <img data-src="holder.js/200x200/auto/vine" class="img-responsive" alt="Generic placeholder thumbnail">
                      <h4>Label</h4>
                      <span class="text-muted">Something else</span>
                   </div>
                </div>
             </div>
          </div>
       </div>

    </body>
</html>

将登录成功后跳转到后台主页面的方式改为转发

为了避免跳转到后台主页面再刷新浏览器导致重复提交登录表单，需要重定向到目标页面。

handler 方法
image-20241124222751929
image-20241124222751929
代码语言：javascript
复制
package com.atguigu.crowd.mvc.handler;

import com.atguigu.crowd.constant.CrowdConstant;
import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.service.api.AdminService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpSession;

/**
 * Copyright (C) 2024 - 2024 Jasonakeke， Inc. All Rights Reserved
 *
 * @Desc :
 * @Time : 2024/11/24 22:02
 * @Author : Code_By_Jasonakeke
 * @Email : 2284037977@qq.com
 * @Class : AdminHandler
 * @IDE : IntelliJ IDEA
 */
@Controller
public class AdminHandler {

    @Autowired
    private AdminService adminService;

    @RequestMapping("/admin/do/login.html")
    public String doLogin(
          @RequestParam("loginAcct") String loginAcct,
          @RequestParam("userPswd") String userPswd,
          HttpSession session
    ){
       // 调用Service方法执行登录检查
       // 这个方法如果能返回 Admin 对象说明登录成功，如果账号密码不正确则会抛出异常
       Admin admin = adminService.getAdminByLoginAcct(loginAcct, userPswd);
       // 将登录成功返回的 Admin 对象存入 Session 域
       session.setAttribute(CrowdConstant.ATTR_NAME_LOGIN_ADMIN, admin);
       return "redirect:/admin/to/main/page.html";
    }
}
配置跳转到后台主页面的 view-controller
image-20241124222957703
image-20241124222957703
代码语言：javascript
复制
<mvc:view-controller path="/admin/to/main/page.html" view-name="admin-main" />

退出登录

修改主页面
image-20241124223428649
image-20241124223428649
添加 handler 方法
代码语言：javascript
复制
@RequestMapping("/admin/do/logout.html")
public String doLogout(HttpSession session){
    // 强制 session 失效
    session.invalidate();
    return "redirect:/admin/to/login/page.html";
}

抽取后台主页面公共部分

include-head.jsp

代码语言：javascript
复制
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="">
    <base href="http://${pageContext.request.serverName}:${pageContext.request.serverPort}${pageContext.request.contextPath}/" />
    <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
    <link rel="stylesheet" href="css/font-awesome.min.css">
    <link rel="stylesheet" href="css/main.css">
    <script src="jquery/jquery-2.1.1.min.js"></script>
    <script src="bootstrap/js/bootstrap.min.js"></script>
    <script src="script/docs.min.js"></script>
    <script src="layer/layer.js"></script>
    <script type="text/javascript">
       $(function () {
          $(".list-group-item").click(function(){
             if ( $(this).find("ul") ) {
                $(this).toggleClass("tree-closed");
                if ( $(this).hasClass("tree-closed") ) {
                   $("ul", this).hide("fast");
                } else {
                   $("ul", this).show("fast");
                }
             }
          });
       });
    </script>
    <style>
       .tree li {
          list-style-type: none;
          cursor:pointer;
       }
       .tree-closed {
          height : 40px;
       }
       .tree-expanded {
          height : auto;
       }
    </style>
</head>

include-nav.jsp

代码语言：javascript
复制
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
    <div class="container-fluid">
       <div class="navbar-header">
          <div><a class="navbar-brand" style="font-size:32px;" href="#">众筹平台 - 控制面板</a></div>
       </div>
       <div id="navbar" class="navbar-collapse collapse">
          <ul class="nav navbar-nav navbar-right">
             <li style="padding-top:8px;">
                <div class="btn-group">
                   <button type="button" class="btn btn-default btn-success dropdown-toggle"
                           data-toggle="dropdown">
                      <i class="glyphicon glyphicon-user"></i> ${sessionScope.loginAdmin.userName} <span
                         class="caret"></span>
                   </button>
                   <ul class="dropdown-menu" role="menu">
                      <li><a href="#"><i class="glyphicon glyphicon-cog"></i> 个人设置</a></li>
                      <li><a href="#"><i class="glyphicon glyphicon-comment"></i> 消息</a></li>
                      <li class="divider"></li>
                      <li><a href="admin/do/logout.html"><i class="glyphicon glyphicon-off"></i> 退出系统</a>
                      </li>
                   </ul>
                </div>
             </li>
             <li style="margin-left:10px;padding-top:8px;">
                <button type="button" class="btn btn-default btn-danger">
                   <span class="glyphicon glyphicon-question-sign"></span> 帮助
                </button>
             </li>
          </ul>
          <form class="navbar-form navbar-right">
             <input type="text" class="form-control" placeholder="查询">
          </form>
       </div>
    </div>
</nav>

include-sidebar.jsp

代码语言：javascript
复制
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<div class="col-sm-3 col-md-2 sidebar">
    <div class="tree">
       <ul style="padding-left:0px;" class="list-group">
          <li class="list-group-item tree-closed">
             <a href="main.html"><i class="glyphicon glyphicon-dashboard"></i> 控制面板</a>
          </li>
          <li class="list-group-item tree-closed">
                         <span><i class="glyphicon glyphicon glyphicon-tasks"></i> 权限管理 <span class="badge"
                                                                                                  style="float:right">3</span></span>
             <ul style="margin-top:10px;display:none;">
                <li style="height:30px;">
                   <a href="user.html"><i class="glyphicon glyphicon-user"></i> 用户维护</a>
                </li>
                <li style="height:30px;">
                   <a href="role.html"><i class="glyphicon glyphicon-king"></i> 角色维护</a>
                </li>
                <li style="height:30px;">
                   <a href="permission.html"><i class="glyphicon glyphicon-lock"></i> 菜单维护</a>
                </li>
             </ul>
          </li>
          <li class="list-group-item tree-closed">
                         <span><i class="glyphicon glyphicon-ok"></i> 业务审核 <span class="badge"
                                                                                     style="float:right">3</span></span>
             <ul style="margin-top:10px;display:none;">
                <li style="height:30px;">
                   <a href="auth_cert.html"><i class="glyphicon glyphicon-check"></i> 实名认证审核</a>
                </li>
                <li style="height:30px;">
                   <a href="auth_adv.html"><i class="glyphicon glyphicon-check"></i> 广告审核</a>
                </li>
                <li style="height:30px;">
                   <a href="auth_project.html"><i class="glyphicon glyphicon-check"></i>
                      项目审核</a>
                </li>
             </ul>
          </li>
          <li class="list-group-item tree-closed">
                         <span><i class="glyphicon glyphicon-th-large"></i> 业务管理 <span class="badge"
                                                                                           style="float:right">7</span></span>
             <ul style="margin-top:10px;display:none;">
                <li style="height:30px;">
                   <a href="cert.html"><i class="glyphicon glyphicon-picture"></i> 资质维护</a>
                </li>
                <li style="height:30px;">
                   <a href="type.html"><i class="glyphicon glyphicon-equalizer"></i> 分类管理</a>
                </li>
                <li style="height:30px;">
                   <a href="process.html"><i class="glyphicon glyphicon-random"></i> 流程管理</a>
                </li>
                <li style="height:30px;">
                   <a href="advertisement.html"><i class="glyphicon glyphicon-hdd"></i>
                      广告管理</a>
                </li>
                <li style="height:30px;">
                   <a href="message.html"><i class="glyphicon glyphicon-comment"></i> 消息模板</a>
                </li>
                <li style="height:30px;">
                   <a href="project_type.html"><i class="glyphicon glyphicon-list"></i>
                      项目分类</a>
                </li>
                <li style="height:30px;">
                   <a href="tag.html"><i class="glyphicon glyphicon-tags"></i> 项目标签</a>
                </li>
             </ul>
          </li>
          <li class="list-group-item tree-closed">
             <a href="param.html"><i class="glyphicon glyphicon-list-alt"></i> 参数管理</a>
          </li>
       </ul>
    </div>
</div>

修改主页面

image-20241124225657659
image-20241124225657659

登录状态检查

目标

将部分资源保护起来，让没有登录的请求不能访问

思路

image-20241125211549286
image-20241125211549286

代码

创建自定义异常
image-20241125212702395
image-20241125212702395
代码语言：javascript
复制
package com.atguigu.crowd.exception;

/**
 * Copyright (C) 2024 - 2024 Jasonakeke， Inc. All Rights Reserved
 *
 * @Desc : 表示用户没有登录就访问受保护资源的异常
 * @Time : 2024/11/25 21:24
 * @Author : Code_By_Jasonakeke
 * @Email : 2284037977@qq.com
 * @Class : AccessForbiddenException
 * @IDE : IntelliJ IDEA
 */
public class AccessForbiddenException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public AccessForbiddenException() {
    }

    public AccessForbiddenException(String message) {
       super(message);
    }

    public AccessForbiddenException(String message, Throwable cause) {
       super(message, cause);
    }

    public AccessForbiddenException(Throwable cause) {
       super(cause);
    }

    public AccessForbiddenException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
       super(message, cause, enableSuppression, writableStackTrace);
    }
}
创建拦截器类
image-20241125211756375
image-20241125211756375
代码语言：javascript
复制
package com.atguigu.crowd.mvc.interceptor;

import com.atguigu.crowd.constant.CrowdConstant;
import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.exception.AccessForbiddenException;
import org.springframework.web.servlet.AsyncHandlerInterceptor;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Copyright (C) 2024 - 2024 Jasonakeke， Inc. All Rights Reserved
 *
 * @Desc :
 * @Time : 2024/11/25 21:17
 * @Author : Code_By_Jasonakeke
 * @Email : 2284037977@qq.com
 * @Class : LoginInterceptor
 * @IDE : IntelliJ IDEA
 */
public class LoginInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
       // 1.通过 request 对象获取 session 对象
       HttpSession session = request.getSession();
       // 2.尝试从 session 对象中获取 Admin 对象
       Admin admin = (Admin) session.getAttribute(CrowdConstant.ATTR_NAME_LOGIN_ADMIN);
       // 3.判断 admin 对象是否为 null
       if (admin == null) {
          // 4.抛出异常
          throw new AccessForbiddenException(CrowdConstant.MESSAGE_ACCESS_FORBIDDEN);
       }
       // 5.如果 admin 对象不为 null，则返回 true，继续向下执行
       return true;
    }

}
注册拦截器类
image-20241125213348549
image-20241125213348549
代码语言：javascript
复制
<!-- 注册拦截器 -->
<mvc:interceptors>
    <mvc:interceptor>
       <!-- mvc:mapping 配置要拦截的资源 -->
       <!-- /*  对应一层路径 -->
       <!-- /** 对应多层路径 -->
       <mvc:mapping path="/**" />
       <!-- mvc:exclude-mapping 配置不拦截的资源 -->
       <mvc:exclude-mapping path="/admin/to/login/page.html" />
       <mvc:exclude-mapping path="/admin/do/login.html" />
       <mvc:exclude-mapping path="/admin/do/logout.html" />
       <!-- 配置拦截器类 -->
       <bean class="com.atguigu.crowd.mvc.interceptor.LoginInterceptor" />
    </mvc:interceptor>
</mvc:interceptors>

完善配套的异常映射

基于 XML 的异常映射
image-20241125215308210
image-20241125215308210
代码语言：javascript
复制
<!-- 配置基于XML的异常映射 -->
<bean id="simpleMappingExceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <!-- 配置异常类型和具体视图页面的对应关系 -->
    <property name="exceptionMappings">
       <props>
          <!-- key属性指定异常的全类名   标签体中写对应的视图(去掉前后缀) -->
          <prop key="java.lang.Exception">system-error</prop>
          <prop key="com.atguigu.crowd.exception.AccessForbiddenException">admin-login</prop>
       </props>
    </property>
</bean>
基于注解的异常映射
image-20241125215704772
image-20241125215704772
代码语言：javascript
复制
@ExceptionHandler(value = AccessForbiddenException.class)
public ModelAndView resolveAccessForbiddenException(AccessForbiddenException exception, HttpServletRequest request, HttpServletResponse response) throws IOException {
    String viewName = "admin-login";
    return commonResolve(viewName, exception, request, response);
}
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原始发表：2024-11-25，如有侵权请联系 cloudcommunity@tencent.com 删除
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目录
  • 目标
  • 思路
  • 代码
    • 创建工具方法执行 MD5 加密
    • 创建登录失败异常类
    • 在异常处理类中增加登录失败异常的处理
    • 在登录页面显示异常消息
    • handler 方法
    • service 方法
    • 创建登录成功的临时主页面
    • 测试
    • 将临时主页面替换为真正的主页面
    • 将登录成功后跳转到后台主页面的方式改为转发
      • handler 方法
      • 配置跳转到后台主页面的 view-controller
    • 退出登录
      • 修改主页面
      • 添加 handler 方法
  • 抽取后台主页面公共部分
    • include-head.jsp
    • include-nav.jsp
    • include-sidebar.jsp
    • 修改主页面
  • 登录状态检查
    • 目标
    • 思路
    • 代码
      • 创建自定义异常
      • 创建拦截器类
      • 注册拦截器类
    • 完善配套的异常映射
      • 基于 XML 的异常映射
      • 基于注解的异常映射
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