前言:本篇文章下上一篇文章的基础上增加了一点功能，点击菜单的选项，会出现对应的内容。
目录
java代码
TreeFactory：
package com.zking.util;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
@SuppressWarnings("all")
public class TreeFactory {
public static List<TreeNode> buildList(List<TreeNode> nodeList) {
List<TreeNode> list = buildList(nodeList, "0");
TreeNode root;
if (!list.isEmpty()) {
return list;
} else {
root = new TreeNode();
root.setId("000");
root.setParentId("-1");
root.setHasParent(false);
root.setHasChildren(true);
root.setChecked(true);
root.setChildren(list);
root.setText("主菜单");
root.setState("closed");
}
return Arrays.asList(root);
}
public static List<TreeNode> buildList(List<TreeNode> nodeList, String topMenuId) {
return Optional.ofNullable(nodeList).map(list -> {
list.forEach(item -> {
list.stream().filter(i -> {
return i.getId().equals(item.getParentId());
}).forEach(i -> {
i.setHasChildren(Boolean.TRUE);
i.getChildren().add(item);
});
});
return list.stream().filter(i -> {
return i.getParentId().equals(topMenuId);
}).collect(Collectors.toList());
}).get();
}
}TreeNode：
package com.zking.util;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@SuppressWarnings("all")
@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
public class TreeNode {
private String id;
private String text;
private String state;
private Boolean checked = false;
private Map<String, Object> attributes=new HashMap<>();
private List<TreeNode> children = new ArrayList<>();
private String parentId;
private Boolean hasParent = false;
private Boolean hasChildren = false;
}DBHelper：
package com.zking.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBHelper {
//定义链接字符串
private static final String URL = "jdbc:oracle:thin:@localhost:1521:orcl";
//加载驱动
static {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
//获得链接
public static Connection getCon() {
try {
return DriverManager.getConnection(URL, "scott", "sa123");
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
//关闭资源
public static void close(Connection con, PreparedStatement ps, ResultSet rs) {
try {
if (con != null && !con.isClosed()) {
con.close();
}
if (ps != null) {
ps.close();
}
if (rs != null) {
rs.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
Permission:
package com.zking.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@SuppressWarnings("all")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Permission {
private Integer id;
private Integer pid;
private String text;
private String url;
}
PermissionDao：
package com.zking.dao;
import com.zking.pojo.Permission;
import com.zking.util.DBHelper;
import com.zking.util.TreeFactory;
import com.zking.util.TreeNode;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
public class PermissionDao {
private Connection con;
private PreparedStatement ps;
private ResultSet rs;
public List<Permission> list() {
List<Permission> list = new ArrayList<Permission>();
try {
con = DBHelper.getCon();
ps = con.prepareStatement("select * from bs_permission");
rs = ps.executeQuery();
while (rs.next()) {
Permission permission = new Permission();
permission.setId(rs.getInt(1));
permission.setPid(rs.getInt(2));
permission.setText(rs.getString(3));
permission.setUrl(rs.getString(4));
list.add(permission);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBHelper.close(con, ps, rs);
}
return list;
}
public List<TreeNode> listNodes() {
List<TreeNode> nodes = new ArrayList<TreeNode>();
//数据库中
List<Permission> list = list();
//将permission封装成node
for (Permission permission : list) {
TreeNode node = new TreeNode();
node.setId(String.valueOf(permission.getId()));
node.setParentId(String.valueOf(permission.getPid()));
node.setText(permission.getText());
//把pid放到自定义属性中
node.getAttributes().put("pid",permission.getPid());
//把url放到自定义属性中
node.getAttributes().put("url",permission.getUrl());
nodes.add(node);
}
return TreeFactory.buildList(nodes, "0");
}
}
PermissionServlet：
package com.zking.servlet;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.zking.dao.PermissionDao;
import com.zking.pojo.Permission;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
@WebServlet("/permission.do")
public class PermissionServlet extends HttpServlet{
private PermissionDao permissionDao=new PermissionDao();
private ObjectMapper mapper = new ObjectMapper();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//查询所有的菜单,将菜单写出去
mapper.writeValue(resp.getOutputStream(),permissionDao.listNodes());
}
}
jsp代码
index：
<%@ page contentType="text/html;charset=UTF-8"%>
<html>
<head>
<title>Title</title>
<script
src="${pageContext.request.contextPath}/jquery-easyui-1.5.5.2/jquery.min.js"></script>
<script
src="${pageContext.request.contextPath}/jquery-easyui-1.5.5.2/jquery.easyui.min.js"></script>
<link rel="stylesheet" type="text/css"
href="${pageContext.request.contextPath}/jquery-easyui-1.5.5.2/themes/default/easyui.css">
<link rel="stylesheet" type="text/css"
href="${pageContext.request.contextPath}/jquery-easyui-1.5.5.2/themes/icon.css">
</head>
<body class="easyui-layout">
<div data-options="region:'north',title:'网站导航栏',collapsible:false"
style="height: 100px;"></div>
<div data-options="region:'west',title:'菜单',split:true"
style="width: 20%;">
<ul id="asideMenu"></ul>
</div>
<div data-options="region:'center',collapsible:false,border:false"
style="padding: 5px; background: #eee;">
<div id="mainTab" class="easyui-tabs"
style="width: 100%; height: 100%;"></div>
</div>
<script>
let mainTab = $('#mainTab')
$('#asideMenu').tree({
url: '${pageContext.request.contextPath}/permission.do', //远程数据的地址
method: "POST",//访问方式
lines: true, //显示虚线
onClick(node) {
//判断是否是父节点
if (!node.attributes['pid']) {
return
}
//判断是不是已经打开了
if(mainTab.tabs('exists',node.text)){
mainTab.tabs('select',node.text)
return
}
mainTab.tabs('add', {
id:node.id,
title: node.text,
content:"<iframe src='"+node.attributes['url']+"'></iframe>"
//href:node.attributes['url']
});
}
});
</script>
</body>
</html>
json代码
tree_data:
[
{
"id": 1,
"text": "商品管理",
"state": "closed",
"attributes": {
"pid": 0
},
"children": [
{
"id": 2,
"text": "商品增加01",
"attributes": {
"pid": 1
}
},{
"id": 3,
"text": "商品增加02",
"attributes": {
"pid": 1
}
}
]
},
{
"id": 10,
"text": "类别管理",
"state": "closed",
"attributes": {
"pid": 0
},
"children": [
{
"id": 12,
"text": "类别增加01",
"attributes": {
"pid": 10
}
},{
"id": 13,
"text": "类别增加02",
"attributes": {
"pid": 10
}
}
]
}
]数据库代码
CREATE TABLE bs_permission
(
id number DEFAULT NULL,
pid number DEFAULT NULL,
text varchar2(10) DEFAULT NULL,
url varchar2(255) DEFAULT NULL
);
create sequence seq_permission;
insert into bs_permission values(seq_permission.nextval,0,'会员管理','');
insert into bs_permission values(seq_permission.nextval,0,'商品管理','');
insert into bs_permission values(seq_permission.nextval,0,'订单管理','');
insert into bs_permission values(seq_permission.nextval,0,'数据报表','');
insert into bs_permission values(seq_permission.nextval,0,'系统管理','');
insert into bs_permission values(seq_permission.nextval,2,'会员卡充值','/manager/user/recharge.jsp');
insert into bs_permission values(seq_permission.nextval,2,'会员等级','/manager/user/level.jsp');
insert into bs_permission values(seq_permission.nextval,3,'状态管理','/manager/goods/state.jsp');
insert into bs_permission values(seq_permission.nextval,3,'类目管理','/manager/user/topic.jsp');
insert into bs_permission values(seq_permission.nextval,3,'评论管理','/manager/user/comment.jsp');
select * from bs_permission;
