会议OA必备！解密Layui神技：轻松构建动态可控的左侧权限菜单列表！-阿里云开发者社区

前言

本文详细讲解了如何根据不同的用户登陆，进入的后台管理系统界面发生不一样的变化

在日常办公和会议管理中，提高工作效率和简化操作流程是每个组织都追求的目标。而利用Layui框架的强大功能，特别是通过打造智能化的左侧权限菜单列表，可以为会议OA管理带来卓越的效果。在本文中，我们将揭秘Layui的神技，探讨如何利用其轻松构建动态可控的会议OA左侧权限菜单列表，让您的工作更高效、更便捷。无论你是会议组织者还是会议参与者，都值得掌握这一利器，提升工作效率，打造智能化会议管理系统。

1、下载和学习使用layui

http://layui.org.cn/index.html

2、权限菜单--数据库分析

在做权限之前，我们用生活的例子来看待，我们往往可以在生活中发现，不同级别的人登陆进入后天管理系统，看到的是不同的功能模块，就比如我们财务人员，登陆后台管理系统是无法进行对公司人员的管理的，

2.1、user表结构

一个 rid 可以对应多个 id ，翻译过来就是，每个人都会有一个角色，但是角色可以对应多个人，也就是说，张三也可以是管理员，李四也可以是管理员，用户登陆的时候，拿到其rid进行判断---后面再说

2.2、permission表结构

在权限表中，我们可以看到有一个id还有pid，同样，pid和id也是一对多的关系，举个例子，我们的qq列表中有个好友分组，一些人属于特别关系，一些人属于其他等等，这里就跟qq一样，假如有两条数据，一条就命名为特别关心，一条命名为xxx，那么特别关心的数据就是

id:1--pid:-1--name:特别关心

id:2--pid:1--name:xxx

对照上面的数据可以发现，子模块的pid对应的就是父级模块id，但是如果是一级模块，那么我们就将其pid设置为-1

2.3、permission-role表结构

在此表中只有两个字段，但是两个字段都非常重要，他将用户表和权限表联合起来了，权限的关键也在于这张表，根据上面两个表的解释，现在走一遍完整的例子

用户登录进入---后台接收---查询到用户---获取其rid---放到permission-role表中查询对应的权限模块id(外键，关联权限表中的id)

就比如我是管理员id1，我的拥有的权限id是，-1，1，21，33.。。

那么此时这张表中的数据就是

1 -1

1 1

1 21

1 33

3、权限菜单演示

对照之后，我们可以很明显的看到zq这个用户登录进去时，是没有系统管理这个模块的，但是admin用户有，这就是因为在role-Permission这张表中，给他们对应的每个角色分配的权限

4、代码实现--登录流程

4.1、login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
  pageEncoding="UTF-8"%>
<%@ include file="common/public.jsp"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>后台登陆界面</title>
<script src="static/js/login.js"></script>
<style>
body {
  background-color: #f5f5f5;
  font-family: Arial, sans-serif;
}
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
.login-box {
  background-color: #fff;
  border-radius: 4px;
  box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.1);
  padding: 40px;
  text-align: center;
}
.login-box h2 {
  margin-bottom: 20px;
  color: #333;
}
.login-box input[type="text"], .login-box input[type="password"] {
  width: 100%;
  padding: 12px 20px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  font-size: 16px;
}
.login-box input[type="button"] {
  background-color: #4CAF50;
  color: #fff;
  border: none;
  padding: 12px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}
.login-box input[type= "button]:hover {
  background-color: #45a049;
}
</style>
</head>
<body>
  <div class="container">
    <div class="login-box">
      <h2>后台登录</h2>
      <form>
        <input id="username" type="text" placeholder="用户名" required>
        <input id="password" type="password" placeholder="密码" required>
        <input id="login" type="button" value="登录">
      </form>
    </div>
  </div>
</body>
</html>

4.2、login.js

layui.use(['jquery','layer'], function(){
    var $ = layui.jquery,
    layer=layui.layer;
    $('#login').click(function(){
      $.ajax({
          url: 'User.action?methodName=login',
          data: {
            loginName: $("#username").val(),
            pwd: $("#password").val()
          },
          dataType: 'text',
          type: 'post',
          success: function(data){
          console.log(data)
            if(data=='登陆成功'){
                  layer.msg('登录成功', {
                    icon: 1,
                    time: 2000
                  }, function(){
                    location.href = "index.jsp";
                  });
                } else {
                  layer.msg('登录失败', {
                    icon: 2,
                    time: 2000
                  });
                }
          }
      });
    })
  });

4.3、userServlet

package Servlet;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
import com.zking.util.PageBean;
import com.zking.util.R;
import com.zking.util.ResponseUtil;
import Dao.Userdao;
import Entity.User;
public class UserServlet extends ActionSupport implements ModelDriver<User>{
private User user= new User();
private PageBean page= new PageBean();
private Userdao ud= new Userdao();
  public String login(HttpServletRequest req, HttpServletResponse resp) throws Exception {
//  调用dao中的方法
    User users = ud.login(user, page);
    if(users!=null) {
      req.getSession().setAttribute("user", users);
      resp.getWriter().write("登陆成功");
    }else {
      resp.getWriter().write("登陆失败");
    }
    return null;
  }
  }

4.4、userdao

package Dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import com.zking.util.BaseDao;
import com.zking.util.DBAccess;
import com.zking.util.PageBean;
import com.zking.util.StringUtils;
import Entity.Role_permission;
import Entity.User;
public class Userdao extends BaseDao<User>{
//  登陆的方法
  public User login(User u,PageBean pagebean) throws Exception {
    String sql="select * from t_oa_user where loginName='"+u.getLoginName()+"' and pwd='"+u.getPwd()+"'";
    List<User> users = super.executeQuery(sql, User.class, pagebean);
    return users == null || users.size() == 0 ? null : users.get(0);
  }
  }

5、代码实现--主界面加载流程

5.1、index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@include file="/common/public.jsp"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>后台管理主界面</title>
 <script src="static/js/index.js" ></script>
<style>
  .layui-tab-title>li:first-child>i{
    display:none;
  }
  .layui-tab>.layui-tab-content{
    padding:0px;
  }
  body,html{
    padding:0px;
    margin:0px;
    overflow:hidden;
  }
  .layui-nav-tree .layui-nav-child dd.layui-this, .layui-nav-tree .layui-nav-child dd.layui-this a, .layui-nav-tree .layui-this, .layui-nav-tree .layui-this>a, .layui-nav-tree .layui-this>a:hover {
    background-color: #2F4056;
    color: #fff;
}
</style>
</head>
<c:if test="${empty user }"> <jsp:forward page="login.jsp"></jsp:forward> </c:if> 
<body>
<div class="layui-layout layui-layout-admin">
  <div class="layui-header ">
    <div class="layui-logo layui-hide-xs">会议OA</div>
    <!-- 头部区域（可配合layui 已有的水平导航） -->
   <!--  <ul class="layui-nav layui-layout-left">
      移动端显示
      <li class="layui-nav-item layui-show-xs-inline-block layui-hide-sm" lay-header-event="menuLeft">
        <i class="layui-icon layui-icon-spread-left"></i>
      </li>
      Top导航栏
      <li class="layui-nav-item layui-hide-xs"><a href="">nav 1</a></li>
      <li class="layui-nav-item layui-hide-xs"><a href="">nav 2</a></li>
      <li class="layui-nav-item layui-hide-xs"><a href="">nav 3</a></li>
      <li class="layui-nav-item">
        <a href="javascript:;">nav groups</a>
        <dl class="layui-nav-child">
          <dd><a href="">menu 11</a></dd>
          <dd><a href="">menu 22</a></dd>
          <dd><a href="">menu 33</a></dd>
        </dl>
      </li>
    </ul> -->
    <!-- 个人头像及账号操作 -->
    <ul class="layui-nav layui-layout-right">
      <li class="layui-nav-item layui-hide layui-show-md-inline-block">
        <a href="javascript:;">
          <img src="//tva1.sinaimg.cn/crop.0.0.118.118.180/5db11ff4gw1e77d3nqrv8j203b03cweg.jpg" class="layui-nav-img">
        ${user.name}
        </a>
        <dl class="layui-nav-child">
          <dd><a href="login.jsp">Sign out</a></dd>
        </dl>
      </li>
      <li class="layui-nav-item" lay-header-event="menuRight" lay-unselect>
        <a href="javascript:;">
          <i class="layui-icon layui-icon-more-vertical"></i>
        </a>
      </li>
    </ul>
  </div>
  <div class="layui-side  layui-bg-black">
    <div class="layui-side-scroll">
      <!-- 左侧导航区域（可配合layui已有的垂直导航） -->
      <ul id="menu" class="layui-nav layui-nav-tree " lay-filter="menu">
      </ul>
    </div>
  </div>
  <div class="layui-body">
    <!-- 内容主体区域 -->
    <div style="padding: 15px;">
      <div class="layui-tab" lay-filter="openTab" lay-allowclose="true">
      <ul class="layui-tab-title">
        <li class="layui-this" lay-id="-1">首页</li>
      </ul>
      <div class="layui-tab-content">
        <div class="layui-tab-item layui-show">首页内容</div>
      </div>
    </div>
    </div>
  </div>
  <div class="layui-footer" style="text-align: center;">
    <!-- 底部固定区域 -->
   Copyright © 2022-2024 版权所有
  </div>
</div>
</body>
</html>

5.2、index.js

let layer,$,element;
layui.use(['jquery', 'layer', 'element'], function(){
  layer = layui.layer
  ,$ = layui.jquery
  ,element = layui.element;
  $.ajax({
    url:'Index.action?methodName=tree'
    ,dataType:'json'
    ,success:function(data){
      let htmlstr = '';
      console.log(data)
      $.each(data,function(i,n){
        htmlstr += '<li class="layui-nav-item layui-nav-itemed  ">';
        htmlstr += ' <a class="" href="javascript:;">'+n.text+'</a>';
        if(n.hasChildren){
          let children = n.children;
          console.log(children)
          htmlstr += '<dl class="layui-nav-child">';
          $.each(children,function(index,node){
            htmlstr += '<dd class=""><a href="javascript:;" onclick="openTab(\''+node.text+'\',\''+node.attributes.self.url+'\',\''+node.id+'\');" >'+node.text+'</a></dd>';
          });
          htmlstr += '</dl>';
        }
        htmlstr += '</li>';
      })
      console.log(htmlstr)
      $("#menu").html(htmlstr);
      //渲染ul标签
    element.render('#menu');
    }
  });
});
function openTab(title,url,id){
  let $node = $("li[lay-id='"+id+"']");
//  此时点击菜单，会自动生成上面的标签，对应的id生成对应的标签，
//  抓到这个标签进行判断，如果为0，打开一个新的tab内嵌一个网页
  if($node.length == 0){
    element.tabAdd('openTab', {
        title: title
        ,content: "<iframe frameborder='0' src='"+url+"' scrolling='auto' style='width:100%;height:100%;'></iframe>"
        ,id: id
      })
  }
//  如果不为0，那么就切换对应id的tab卡
  element.tabChange('openTab', id); //切换到
}

5.3、Indexservlet

package Servlet;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zking.framework.ActionSupport;
import com.zking.util.R;
import com.zking.util.ResponseUtil;
import com.zking.util.TreeVo;
import Dao.Permissiondao;
import Entity.Permission;
import Entity.User;
public class IndexServlet extends ActionSupport{
  public String tree(HttpServletRequest req, HttpServletResponse resp) throws Exception {
    User u = (User) req.getSession().getAttribute("user");
    Permissiondao p= new Permissiondao();
    List<TreeVo<Permission>> menus = p.menus(u);
    System.out.println(menus);
    ResponseUtil.writeJson(resp, menus);
    return null;
  }
}

5.4、dao方法

//  根据模块id查询整个模块
  public Permission querypermissionby_id(int id) {
    String sql="select * from t_oa_permission where id='"+id+"'";
    Connection conn=null;
    PreparedStatement ps= null;
    ResultSet rs=null;
    Permission p=null;
    try {
      conn=DBAccess.getConnection();
      ps=conn.prepareStatement(sql);
      rs=ps.executeQuery();
      if(rs.next()) {
        p= new Permission(rs.getLong(1), rs.getString(2), rs.getString(3), rs.getString(4), rs.getLong(5), rs.getInt(6), rs.getLong(7));
      }
    } catch (Exception e) {
  e.printStackTrace();
    }
    return p;
  }
==========================================================================================
// 根据指定用户查出对应的所有模块
  public List<Permission> executeQuery(User u) {
    Connection conn = null;
    PreparedStatement ps = null;
    ResultSet rs = null;
    Role_permission r = null;
    List<Permission> list = new ArrayList<>();
    System.out.println( u.getRid());
    String sql = "select * from t_oa_role_permission where rid = '" + u.getRid() + "'";
    try {
      conn=DBAccess.getConnection();
      ps=conn.prepareStatement(sql);
      rs=ps.executeQuery();
      while(rs.next()) {
        r = new Role_permission(rs.getInt(1),new Permissiondao().querypermissionby_id(rs.getInt(2)));
//        将查询到的角色权限对象，拿出权限对象全部放入新的集合
        list.add(r.getPid());
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return list;
  }
==================================================================================
//调用treevo进行分级
  public List<TreeVo<Permission>> menus(User u) throws Exception{
    List<Permission> list =new Role_permissiondao().executeQuery(u);
    List<TreeVo<Permission>> treeVos = new ArrayList<TreeVo<Permission>>();
    for (Permission p : list) {
      TreeVo<Permission> vo = new TreeVo<>();
      vo.setId(p.getId()+"");
      vo.setParentId(p.getPid()+"");
      vo.setText(p.getName());
      Map<String, Object> attributes = new HashMap<String, Object>();
      attributes.put("self", p);
      vo.setAttributes(attributes );
      treeVos.add(vo);
    }
//    TreeVo<Permission> build = BuildTree.build(treeVos);
    List<TreeVo<Permission>> buildList = BuildTree.buildList(treeVos, "-1");
    return buildList;
  }

6、代码实现--前期准备（懒得改目录了兄弟们🤣🤣🤣）

6.1、user类

package Entity;
public class User {
  private long id;
   private String name;
   private String loginName;
   private String pwd;
   private long rid;
  public User() {
    // TODO Auto-generated constructor stub
  }
  public User(long id, String name, String loginName, String pwd, long rid) {
    super();
    this.id = id;
    this.name = name;
    this.loginName = loginName;
    this.pwd = pwd;
    this.rid = rid;
  }
  public long getId() {
    return id;
  }
  public void setId(long id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getLoginName() {
    return loginName;
  }
  public void setLoginName(String loginName) {
    this.loginName = loginName;
  }
  public String getPwd() {
    return pwd;
  }
  public void setPwd(String pwd) {
    this.pwd = pwd;
  }
  public long getRid() {
    return rid;
  }
  public void setRid(long rid) {
    this.rid = rid;
  }
  @Override
  public String toString() {
    return "User [id=" + id + ", name=" + name + ", loginName=" + loginName + ", pwd=" + pwd + ", rid=" + rid + "]";
  }
  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + (int) (id ^ (id >>> 32));
    result = prime * result + ((loginName == null) ? 0 : loginName.hashCode());
    result = prime * result + ((name == null) ? 0 : name.hashCode());
    result = prime * result + ((pwd == null) ? 0 : pwd.hashCode());
    result = prime * result + (int) (rid ^ (rid >>> 32));
    return result;
  }
  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    User other = (User) obj;
    if (id != other.id)
      return false;
    if (loginName == null) {
      if (other.loginName != null)
        return false;
    } else if (!loginName.equals(other.loginName))
      return false;
    if (name == null) {
      if (other.name != null)
        return false;
    } else if (!name.equals(other.name))
      return false;
    if (pwd == null) {
      if (other.pwd != null)
        return false;
    } else if (!pwd.equals(other.pwd))
      return false;
    if (rid != other.rid)
      return false;
    return true;
  }
}

6.2、permission类

package Entity;
public class Permission {
  private long id;
  private String name;
  private String description;
  private String url;
  private long pid;
  private int ismenu;
  private long displayno;
  public Permission() {
    // TODO Auto-generated constructor stub
  }
  public long getId() {
    return id;
  }
  public void setId(long id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getDescription() {
    return description;
  }
  public void setDescription(String description) {
    this.description = description;
  }
  public String getUrl() {
    return url;
  }
  public void setUrl(String url) {
    this.url = url;
  }
  public long getPid() {
    return pid;
  }
  public void setPid(long pid) {
    this.pid = pid;
  }
  public int getIsmenu() {
    return ismenu;
  }
  public void setIsmenu(int ismenu) {
    this.ismenu = ismenu;
  }
  public long getDisplayno() {
    return displayno;
  }
  public void setDisplayno(long displayno) {
    this.displayno = displayno;
  }
  public Permission(long id, String name, String description, String url, long pid, int ismenu, long displayno) {
    super();
    this.id = id;
    this.name = name;
    this.description = description;
    this.url = url;
    this.pid = pid;
    this.ismenu = ismenu;
    this.displayno = displayno;
  }
  @Override
  public String toString() {
    return "Permission [id=" + id + ", name=" + name + ", description=" + description + ", url=" + url + ", pid="
        + pid + ", ismenu=" + ismenu + ", displayno=" + displayno + "]";
  }
}

6.3、permission_role类

package Entity;
public class Role_permission {
  private int rid;  //用户表中的角色id   
  private Permission pid;//权限表中的模块id
public Role_permission() {
  // TODO Auto-generated constructor stub
}
public Role_permission(int rid, Permission pid) {
  super();
  this.rid = rid;
  this.pid = pid;
}
public int getRid() {
  return rid;
}
public void setRid(int rid) {
  this.rid = rid;
}
public Permission getPid() {
  return pid;
}
public void setPid(Permission pid) {
  this.pid = pid;
}
@Override
public String toString() {
  return "Role_permission [rid=" + rid + ", pid=" + pid + "]";
}
}

6.4、treevo类

package com.zking.util;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class TreeVo<T> {
  /**
   * 节点ID
   */
  private String id;
  /**
   * 显示节点文本
   */
  private String text;
  /**
   * 节点状态，open closed
   */
  private Map<String, Object> state;
  /**
   * 节点是否被选中 true false
   */
  private boolean checked = false;
  /**
   * 节点属性
   */
  private Map<String, Object> attributes;
  /**
   * 节点的子节点
   */
  private List<TreeVo<T>> children = new ArrayList<TreeVo<T>>();
  /**
   * 父ID
   */
  private String parentId;
  /**
   * 是否有父节点
   */
  private boolean hasParent = false;
  /**
   * 是否有子节点
   */
  private boolean hasChildren = false;
  public String getId() {
    return id;
  }
  public void setId(String id) {
    this.id = id;
  }
  public String getText() {
    return text;
  }
  public void setText(String text) {
    this.text = text;
  }
  public Map<String, Object> getState() {
    return state;
  }
  public void setState(Map<String, Object> state) {
    this.state = state;
  }
  public boolean isChecked() {
    return checked;
  }
  public void setChecked(boolean checked) {
    this.checked = checked;
  }
  public Map<String, Object> getAttributes() {
    return attributes;
  }
  public void setAttributes(Map<String, Object> attributes) {
    this.attributes = attributes;
  }
  public List<TreeVo<T>> getChildren() {
    return children;
  }
  public void setChildren(List<TreeVo<T>> children) {
    this.children = children;
  }
  public boolean isHasParent() {
    return hasParent;
  }
  public void setHasParent(boolean isParent) {
    this.hasParent = isParent;
  }
  public boolean isHasChildren() {
    return hasChildren;
  }
  public void setChildren(boolean isChildren) {
    this.hasChildren = isChildren;
  }
  public String getParentId() {
    return parentId;
  }
  public void setParentId(String parentId) {
    this.parentId = parentId;
  }
  public TreeVo(String id, String text, Map<String, Object> state, boolean checked, Map<String, Object> attributes,
                  List<TreeVo<T>> children, boolean isParent, boolean isChildren, String parentID) {
    super();
    this.id = id;
    this.text = text;
    this.state = state;
    this.checked = checked;
    this.attributes = attributes;
    this.children = children;
    this.hasParent = isParent;
    this.hasChildren = isChildren;
    this.parentId = parentID;
  }
  public TreeVo() {
    super();
  }
  @Override
  public String toString() {
    return "TreeVo [id=" + id + ", text=" + text + ", state=" + state + ", checked=" + checked + ", attributes="
        + attributes + ", children=" + children + ", parentId=" + parentId + ", hasParent=" + hasParent
        + ", hasChildren=" + hasChildren + "]";
  }
}

6.5、BuildTree类

package com.zking.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class BuildTree {
  /**
   * 默认-1为顶级节点
   * @param nodes
   * @param <T>
   * @return
   */
  public static <T> TreeVo<T> build(List<TreeVo<T>> nodes) {
    if (nodes == null) {
      return null;
    }
    List<TreeVo<T>> topNodes = new ArrayList<TreeVo<T>>();
    for (TreeVo<T> children : nodes) {
      String pid = children.getParentId();
      if (pid == null || "-1".equals(pid)) {
        topNodes.add(children);
        continue;
      }
      for (TreeVo<T> parent : nodes) {
        String id = parent.getId();
        if (id != null && id.equals(pid)) {
          parent.getChildren().add(children);
          children.setHasParent(true);
          parent.setChildren(true);
          continue;
        }
      }
    }
    TreeVo<T> root = new TreeVo<T>();
    if (topNodes.size() == 1) {
      root = topNodes.get(0);
    } else {
      root.setId("000");
      root.setParentId("-1");
      root.setHasParent(false);
      root.setChildren(true);
      root.setChecked(true);
      root.setChildren(topNodes);
      root.setText("顶级节点");
      Map<String, Object> state = new HashMap<>(16);
      state.put("opened", true);
      root.setState(state);
    }
    return root;
  }
  /**
   * 指定idparam为顶级节点
   * @param nodes
   * @param idParam
   * @param <T>
   * @return
   */
  public static <T> List<TreeVo<T>> buildList(List<TreeVo<T>> nodes, String idParam) {
    if (nodes == null) {
      return null;
    }
    List<TreeVo<T>> topNodes = new ArrayList<TreeVo<T>>();
    for (TreeVo<T> children : nodes) {
      String pid = children.getParentId();
      if (pid == null || idParam.equals(pid)) {
        topNodes.add(children);
        continue;
      }
      for (TreeVo<T> parent : nodes) {
        String id = parent.getId();
        if (id != null && id.equals(pid)) {
          parent.getChildren().add(children);
          children.setHasParent(true);
          parent.setChildren(true);
          continue;
        }
      }
    }
    return topNodes;
  }
}

会议OA必备！解密Layui神技：轻松构建动态可控的左侧权限菜单列表！

前言

1、下载和学习使用layui

2、权限菜单--数据库分析

2.1、user表结构

2.2、permission表结构

2.3、permission-role表结构

3、权限菜单演示

4、代码实现--登录流程

4.1、login.jsp

4.2、login.js

4.3、userServlet

4.4、userdao

5、代码实现--主界面加载流程

5.1、index.jsp

5.2、index.js

5.3、Indexservlet

5.4、dao方法

6、代码实现--前期准备（懒得改目录了兄弟们🤣🤣🤣）

6.1、user类

6.2、permission类

6.3、permission_role类

6.4、treevo类

6.5、BuildTree类

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