一.介绍

1.什么是菜单模块？

Layui是一个轻量级的前端框架，提供了丰富的UI组件和便捷的开发方式，而菜单模块是Layui中的一个核心组件之一，用于创建和管理网页导航菜单。

2.layui菜单模块有什么用？

3.为什么layui现在仍然有企业在使用？

                            二.将layui菜单栏部署在web中

1.思路

2.实操

2.1查看数据库数据，编写实体

package com.zking.entity;

public class Permission {
/*
*lz
**
/
 private  long id;
 private   String  name;
 private    String   description;
 private    String   url;
 private  long pid;
 private    int ismenu;
 private   long   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;
}
/**
 * @return the id
 */
public long getId() {
	return id;
}
/* (non-Javadoc)
 * @see java.lang.Object#toString()
 */
@Override
public String toString() {
	return "Permission [id=" + id + ", name=" + name + ", description=" + description + ", url=" + url + ", pid=" + pid
			+ ", ismenu=" + ismenu + ", displayno=" + displayno + "]";
}
public Permission() {
	super();
}
/**
 * @param id the id to set
 */
public void setId(long id) {
	this.id = id;
}
/**
 * @return the name
 */
public String getName() {
	return name;
}
/**
 * @param name the name to set
 */
public void setName(String name) {
	this.name = name;
}
/**
 * @return the description
 */
public String getDescription() {
	return description;
}
/**
 * @param description the description to set
 */
public void setDescription(String description) {
	this.description = description;
}
/**
 * @return the url
 */
public String getUrl() {
	return url;
}
/**
 * @param url the url to set
 */
public void setUrl(String url) {
	this.url = url;
}
/**
 * @return the pid
 */
public long getPid() {
	return pid;
}
/**
 * @param pid the pid to set
 */
public void setPid(long pid) {
	this.pid = pid;
}
/**
 * @return the ismenu
 */
public int getIsmenu() {
	return ismenu;
}
/**
 * @param ismenu the ismenu to set
 */
public void setIsmenu(int ismenu) {
	this.ismenu = ismenu;
}
/**
 * @return the displayno
 */
public long getdisplayno() {
	return displayno;
}
/**
 * @param displayno the displayno to set
 */
public void setdisplayno(long displayno) {
	this.displayno = displayno;
}
 
 
}

 2.2编写dao方法

package com.zking.dao;

import java.util.ArrayList;
import java.util.List;

import com.sun.org.apache.bcel.internal.generic.RETURN;
import com.zking.entity.Permission;
import com.zking.util.BaseDao;
import com.zking.util.BuildTree;
import com.zking.util.PageBean;
import com.zking.util.TreeVo;

public class PermissionDao extends BaseDao<Permission> {

	public List<Permission> list(Permission permission, PageBean pageBean) throws Exception {
		String sql = "select *from  t_oa_permission  ";
		return super.executeQuery(sql, Permission.class, pageBean);
	}

	/**
	 * 将平级转换成父子关系
	 * 
	 * @throws Exception
	 * 
	 */
	public List<TreeVo<Permission>> menus(Permission permission, PageBean pageBean) throws Exception {
		List<TreeVo<Permission>>lst=new ArrayList<TreeVo<Permission>>();
		List<Permission> list = this.list(permission, pageBean);
        for (Permission p : list) {
        	TreeVo<Permission>vo=new TreeVo<>();
        	vo.setId(p.getId()+"");
        	vo.setText(p.getName());
        	vo.setParentId(p.getPid()+"");
        	lst.add(vo);
		}
		return   BuildTree.buildList(lst, "-1");
	}


}

2.3TreeVo构建父子关系

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();
	}

}

2.3构建servelt ，配置xml文件

package com.zking.web;

import java.util.List;

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

import com.zking.dao.PermissionDao;
import com.zking.entity.Permission;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
import com.zking.util.ResponseUtil;
import com.zking.util.TreeVo;

public class PermissionAction extends ActionSupport implements ModelDriver<Permission> {
	private Permission permission = new Permission();
	private PermissionDao pd = new PermissionDao();

	  
	public void menus(HttpServletRequest req, HttpServletResponse resp) {
	try {
		List<TreeVo<Permission>> menus = pd.menus( null, null);
	ResponseUtil.writeJson(resp, menus);
	} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
		
	}
	
	@Override
	public Permission getModel() {
		// TODO Auto-generated method stub
		return permission;
	}

}

package com.zking.web;

import java.util.List;

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

import com.zking.dao.PermissionDao;
import com.zking.entity.Permission;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
import com.zking.util.ResponseUtil;
import com.zking.util.TreeVo;

public class PermissionAction extends ActionSupport implements ModelDriver<Permission> {
	private Permission permission = new Permission();
	private PermissionDao pd = new PermissionDao();

	  
	public void menus(HttpServletRequest req, HttpServletResponse resp) {
	try {
		List<TreeVo<Permission>> menus = pd.menus( null, null);
	ResponseUtil.writeJson(resp, menus);
	} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
		
	}
	
	@Override
	public Permission getModel() {
		// TODO Auto-generated method stub
		return permission;
	}

}

	
	<action path="/permission" type="com.zking.web.PermissionAction">
	</action>

2.4在web实现效果

1.静态界面效果

 2.动态界面效果

 3.代码

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ include file="common/header.jsp"%>
<!DOCTYPE html PUBLIC >
<html>
<head>
<head>
<meta name="viewport"
	content="width=device-width,initial-scale=1.33,minimum-scale=1.0,maximum-scale=1.0">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<title>主程序</title>
<meta http-equiv="Content-Language" content="zh-CN">

</head>
<body>
	<div class="layui-layout layui-layout-admin">
		<div class="layui-header">
			<div class="layui-logo layui-hide-xs layui-bg-black">layout
				demo</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"> tester
		</a>
			<dl class="layui-nav-child">
				<dd>
					<a href="">Your Profile</a>
				</dd>
				<dd>
					<a href="">Settings</a>
				</dd>
				<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">
			<li class="layui-nav-item layui-nav-itemed"><a class=""
				href="javascript:;">menu group 1</a>
				<dl class="layui-nav-child">
					<dd>
						<a href="javascript:;">menu 1</a>
					</dd>
					<dd>
						<a href="javascript:;">menu 2</a>
					</dd>
					<dd>
						<a href="javascript:;">menu 3</a>
					</dd>
					<dd>
						<a href="">the links</a>
					</dd>
				</dl></li>
			<li class="layui-nav-item"><a href="javascript:;">menu
					group 2</a>
				<dl class="layui-nav-child">
					<dd>
						<a href="javascript:;">list 1</a>
					</dd>
					<dd>
						<a href="javascript:;">list 2</a>
					</dd>
					<dd>
						<a href="">超链接</a>
					</dd>
				</dl></li>
			<li class="layui-nav-item"><a href="javascript:;">click
					menu item</a></li>
			<li class="layui-nav-item"><a href="">the links</a></li>

		</ul>
	</div>
</div>

<div class="layui-body">
	<!-- 内容主体区域 -->
<div style="padding: 15px;">内容主体区域。记得修改 layui.css 和 js 的路径</div>
</div>

<div class="layui-footer">
	<!-- 底部固定区域 -->
		底部固定区域
	</div>
</div>
<script>
//JS 
layui
		.use(
				[ 'element', 'layer', 'util' ],
				function() {
					var element = layui.element, layer = layui.layer, util = layui.util, $ = layui.$;
					$
							.ajax({
								url : "${pageContext.request.contextPath }/permission.action?methodName=menus",
								dataType : 'json',
								success : function(data) {
									console.log(data);
									var htmlar = '';
									$
											.each(
													data,
													function(i, n) {
														htmlar += '<li class="layui-nav-item layui-nav-itemed">';
														htmlar += '<a class=""  href="javascript:;">'
																+ n.text
																+ '</a>';
														if (n.hasChildren) {
															var Children = n.Children;
															htmlar += '<dl class="layui-nav-child">';
															$
																	.each(
																			data,
																			function(
																					idx,
																					node) {
																				htmlar += '<dd><a href="">'
																						+ node.text
																						+ '</a></dd>';
																			})
															htmlar += '</dl>';
														}
														htmlar += '</li>';
													})
									$("#menu").html(htmlar);
									element.render('menu');
								}
							});
				});
</script>
</body>
</html>