二、动态面板

数据库设计
函数设计：该函数用于获取某个节点的所有子节点

CREATE FUNCTION fn_getAddress_ChildList_test(rootId INT) RETURNS varchar(1000) CHARSET utf8 #rootId为你要查询的节点

BEGIN

#声明两个临时变量

DECLARE temp VARCHAR(1000);

DECLARE tempChd VARCHAR(1000);

SET temp = '0';

SET tempChd=CAST(rootId AS CHAR);#把rootId强制转换为字符

WHILE tempChd is not null DO

SET temp = CONCAT(temp,',',tempChd);#循环把所有节点连接成字符串。

SELECT GROUP_CONCAT(menu_id) INTO tempChd FROM menu where FIND_IN_SET(parent_id,tempChd)>0;

END WHILE;

RETURN temp;

END

index.jsp

<a href="<%=path%>/servlet/getAccordion">跳转到动态的折叠面板</a>

```
/servlet/getAccordion 这个servlet
```

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        request.setCharacterEncoding("UTF-8");

        response.setCharacterEncoding("UTF-8");

        Connection conn=null;

        String sql="";

        try {

            QueryRunner queryRunner=new QueryRunner();

            conn=DBUtil.getConn();

            sql="select * from menu where grade=1";

            List<Menu> menuList=queryRunner.query(conn, sql, new BeanListHandler<>(Menu.class));

            request.setAttribute("menuList", menuList);

        } catch (Exception e) {

            e.printStackTrace();

        }

        request.getRequestDispatcher("/accrodion.jsp").forward(request, response);

    }

```
accrodion.jsp
```

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<!DOCTYPE html >

<html>

<%

    String path = request.getContextPath();

%>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

<link rel="stylesheet" type="text/css"

    href="<%=path%>/script/easyUI-1.4/themes/bootstrap/easyui.css">

<link rel="stylesheet" type="text/css"

    href="<%=path%>/script/easyUI-1.4/themes/icon.css">

<script type="text/javascript"

    src="<%=path%>/script/easyUI-1.4/jquery-1.8.3.min.js"></script>

<script type="text/javascript"

    src="<%=path%>/script/easyUI-1.4/jquery.easyui.min.js"></script>

<script type="text/javascript"

    src="<%=path%>/script/easyUI-1.4/locale/easyui-lang-zh_CN.js"></script>

</head>

<body class="easyui-layout">

    <h2>2.动态的折叠面板</h2>

    <div id="aa" class="easyui-accordion"

        style="width: 300px; height: 200px;" data-options="region:'west'">

        <c:forEach var="menuBean" items="${requestScope.menuList}">

            <div title="${menuBean.menu_name}">

                <ul class="easyui-tree" data-options="url:'<%=path%>/servlet/getData?menu_id=${menuBean.menu_id}'"></ul>

            </div>

        </c:forEach>

    </div>

</body>

</html>

servlet/getData 这个servlet用于根据menuid来获取这个菜单的所有子菜单的数据

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

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 org.apache.commons.dbutils.QueryRunner;

import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.google.gson.Gson;

import bean.Menu;

import bean.NodeBean;

import util.DBUtil;

/**

 * Servlet implementation class getDateServlet

 */

@WebServlet("/servlet/getData")

public class GetDataServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        this.doPost(request, response);

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        request.setCharacterEncoding("UTF-8");

        response.setCharacterEncoding("UTF-8");

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        String menu_id = request.getParameter("menu_id");
//该函数fn_getAddress_ChildList_test是数据库函数，文章开头已经定义，该函数用户获取menu_id的所有子节点，查询结果包括这个menu_id，所有grade>1

        String sql = "select * from menu where grade>1 and FIND_IN_SET(menu_Id,fn_getAddress_ChildList_test("+menu_id+"))";

        try {

            Connection conn = DBUtil.getConn();

            QueryRunner queryRunner = new QueryRunner();

            List<Map<String, Object>> treeList = new ArrayList<Map<String, Object>>();

            List<Menu> menuList = queryRunner.query(conn, sql, new BeanListHandler<>(Menu.class));

            Map<String, Map<String, Object>> id_nodeMap = new HashMap<String, Map<String, Object>>();

            Map<String, Object> nodeMap = null;

            for (Menu menu : menuList) {

                nodeMap = new HashMap<String, Object>();

                nodeMap.put("id", menu.getMenu_id());

                nodeMap.put("text", menu.getMenu_name());

                id_nodeMap.put(String.valueOf(menu.getMenu_id()), nodeMap);

                if (menu.getParent_id() == Integer.valueOf(menu_id)) {

                    treeList.add(nodeMap);

                } else {

                    Map<String, Object> parenMap = id_nodeMap.get(String.valueOf(menu.getParent_id()));

                    if (parenMap != null) {

                        List<Map<String, Object>> children = null;

                        if (parenMap.get("children") == null) {

                            // 说明该父节点当前还没有一个子节点

                            children = new ArrayList<Map<String, Object>>();

                        } else {

                            children = (List<Map<String, Object>>) parenMap.get("children");

                        }

                        children.add(nodeMap);

                        parenMap.put("children", children);

                    }

                }

            }

            Gson gson = new Gson();

            String json_res = gson.toJson(treeList);

            out.print(json_res);

            out.flush();

            out.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    public static void main(String[] args) {

    }

}

结果：

（八）easyUI之Accordion折叠面板：动态面板

秒客网

（八）easyUI之Accordion折叠面板：动态面板

二、动态面板

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