樹形網格（TreeGrid）可以展示有限空間上帶有多列和復雜數據電子表
一、案例一：按tree的數據結構來生成

前臺

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!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><script type="text/javascript">jQuery(function(){$('#tt').treegrid({    url:"<%=path%>/servlet/treeGrid",    method: 'post',lines: true,rownumbers: true,//定義關鍵字段來標識樹節點
            idField: 'dept_id',//treeField屬性定義哪個字段顯示為樹形菜單
            treeField: 'dept_name',columns:[[    {title:'部門名稱',field:'dept_name',width:180},    {title:'平均薪水',field:'salary',width:60,align:'right'},    {title:'部門地址',field:'address',width:80}  ]]    });  });
</script><body>
<h2>樹形網格treeGrid</h2>
<table id="tt" style="width:600px;height:400px"></table>  
</body>
</html>

后臺

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.Dept;
import util.DBUtil;/*** Servlet implementation class DeptServlet*/
@WebServlet("/servlet/treeGrid")
public class DeptServlet 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 treeGrid_json="";String sql="";Connection conn=null;try {conn=DBUtil.getConn();QueryRunner queryRunner=new QueryRunner();sql="select * from dept";List<Map<String,Object>> treeGridData=new ArrayList<Map<String,Object>>();Map<String,Object> deptMap=null;List<Dept> deptList=queryRunner.query(conn,sql,new BeanListHandler<>(Dept.class));Map<String,Map<String,Object>> id_map=new HashMap<String,Map<String,Object>>();for(Dept dept:deptList){deptMap=new HashMap<String,Object>();deptMap.put("dept_id", dept.getDept_id());deptMap.put("dept_name", dept.getDept_name());deptMap.put("salary", dept.getSalary());deptMap.put("address", dept.getAddress());id_map.put(dept.getDept_id(), deptMap);if(dept.getGrade()>2){deptMap.put("state", "closed");}if(dept.getParent_id().equals("0")){//如果是父節點，則直接添加到treeGridData中treeGridData.add(deptMap);}else{//如果是子節點Map<String,Object> parenMap=id_map.get(dept.getParent_id());if (parenMap != null) {List<Map<String, Object>> children = null;if (parenMap.get("children") == null) {// 說明該父節點當前還沒有一個子節點children = new ArrayList<Map<String, Object>>();} else {children = (List<Map<String, Object>>) parenMap.get("children");}children.add(deptMap);parenMap.put("children", children);}}}Gson gson=new Gson();treeGrid_json=gson.toJson(treeGridData);out.println(treeGrid_json);out.flush();out.close();} catch (Exception e) {e.printStackTrace();}}}

結果：

異步樹請參考前幾章。

?二、案例二：按Grid的數據結構來生成+查詢功能

?數據庫

定義數據庫函數：用于用于根據某個節點的所有父節點

BEGIN   
DECLARE fid varchar(100) default '';   
DECLARE str varchar(1000) default rootId;   WHILE rootId is not null  do   SET fid =(SELECT parent_id FROM dept WHERE dept_id = rootId);   IF fid is not null THEN   SET str = concat(str, ',', fid);   SET rootId = fid;   ELSE   SET rootId = fid;   END IF;   
END WHILE;   
return str;  
END

前臺

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!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><script type="text/javascript">jQuery(function(){$('#tt').treegrid({    url:"<%=path%>/servlet/treeGrid",method : 'post',lines : true,rownumbers : true,//定義關鍵字段來標識樹節點
            idField : 'dept_id',//treeField屬性定義哪個字段顯示為樹形菜單
            treeField : 'dept_name',columns : [ [ {title : '部門名稱',field : 'dept_name',width : 180}, {title : '平均薪水',field : 'salary',width : 60,align : 'right'}, {title : '部門地址',field : 'address',width : 80} ] ],toolbar: '#search_div'});});function doSearch(value,name){var paramData={name:value};$('#tt').treegrid({ queryParams:paramData});}</script><body><h2>樹形網格treeGrid</h2><div id="search_div"><input class="easyui-searchbox" style="width: 300px"data-options="searcher:doSearch,prompt:'Please Input Value'" name="keyWord"></input></div><table id="tt" style="width: 600px; height: 400px"></table>
</body>
</html>

后臺

package servlet;import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
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.MapListHandler;import com.google.gson.Gson;import util.DBUtil;/*** Servlet implementation class DeptServlet*/
@WebServlet("/servlet/treeGrid")
public class DeptServlet 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();Connection conn = null;Statement stat = null;ResultSet rs = null;String sql = "";String keyWord = request.getParameter("name");if (keyWord == null  || keyWord.equals("")) {// 如果沒有查詢參數sql = "select * from dept";} else {/*** 如果游查詢參數 1.先找出子菜單*/String tempSQL = "select dept_id,dept_name from dept where dept_name like '%" + keyWord+ "%'  order by dept_id asc ";try {conn = DBUtil.getConn();QueryRunner queryRunner = new QueryRunner();List<Map<String, Object>> temList = queryRunner.query(conn, tempSQL, new MapListHandler());StringBuffer unionSQL = new StringBuffer();int rowIndex = 0;for (Map<String, Object> temMap : temList) {String tem_dept_Id = String.valueOf(temMap.get("dept_id"));/*** 2.根據得到的tem_dept_Id，去尋找相應的子節點* 請在數據庫中定義一個函數，該函數用于根據某個節點的所有父節點*/unionSQL.append("select dept_id from dept where FIND_IN_SET(dept_id,getParentList('" + tem_dept_Id + "'))");rowIndex++;if (rowIndex > 0 && rowIndex != temList.size()) {unionSQL.append(" union ");}}if (unionSQL.length() > 0) {sql = "select * from dept where dept_id in(";sql = sql + unionSQL.toString();sql = sql + ")";}} catch (Exception e) {e.printStackTrace();}}try {conn = DBUtil.getConn();stat = conn.createStatement();rs = stat.executeQuery(sql);List<Map<String, String>> gridDataList = new ArrayList<Map<String, String>>();Map<String, Object> gridDataMap = new HashMap<String, Object>();Map<String, String> columnMap = null;while (rs.next()) {String id = (String.valueOf(rs.getInt("dept_id")));String parent_id = (String.valueOf(rs.getInt("parent_id")));String dept_name = rs.getString("dept_name");String salary = rs.getString("salary");String address = rs.getString("address");columnMap = new HashMap<String, String>();columnMap.put("dept_id", id);columnMap.put("dept_name", dept_name);columnMap.put("salary", salary);columnMap.put("address", address);/*** 加入樹形表格的特殊屬性，一定要加否則樣式不成樹狀*/if (parent_id.equals("0") == false) {columnMap.put("_parentId", parent_id);}gridDataList.add(columnMap);}gridDataMap.put("total", gridDataList.size());gridDataMap.put("rows", gridDataList);Gson gson = new Gson();String str_gridData = gson.toJson(gridDataMap);System.out.println(str_gridData);out.print(str_gridData);} catch (Exception e) {e.printStackTrace();}out.flush();out.close();}}