Extjs3.2+Json lib动态树与GridPanel简单展现

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最近项目中要用到Extjs，网上搜了写文档看了之后，写了个小Demo。

Demo描述：

将部门信息用树展示出来，点击树节点的某个部门之后，弹出一个窗口，该窗口中展示这个部门中员工的列表。

首先，到http://www.sencha.com/products/js/download.php下载Extjs3.2的发布包，因为要用到json lib，所以还要到http://sourceforge.net/projects/json-lib/files/json-lib/下载json lib。

mysql数据库脚本：

DROP TABLE IF EXISTS `dept`; CREATE TABLE `dept` ( `deptno` int(11) NOT NULL AUTO_INCREMENT, `deptname` varchar(255) NOT NULL DEFAULT '', `parentno` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`deptno`) ) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8; LOCK TABLES `dept` WRITE; /*!40000 ALTER TABLE `dept` DISABLE KEYS */; INSERT INTO `dept` VALUES (1,'管理部',0); INSERT INTO `dept` VALUES (2,'销售部',0); INSERT INTO `dept` VALUES (3,'人力资源部',0); INSERT INTO `dept` VALUES (4,'开发部',0); INSERT INTO `dept` VALUES (5,'后勤部',0); INSERT INTO `dept` VALUES (6,'软件开发部',4); INSERT INTO `dept` VALUES (7,'增值开发部',4); INSERT INTO `dept` VALUES (8,'增值销售部',2); INSERT INTO `dept` VALUES (9,'产品销售部',2); INSERT INTO `dept` VALUES (10,'人妖部',3); /*!40000 ALTER TABLE `dept` ENABLE KEYS */; UNLOCK TABLES; DROP TABLE IF EXISTS `emp`; CREATE TABLE `emp` ( `empno` int(11) NOT NULL AUTO_INCREMENT, `empname` varchar(255) NOT NULL DEFAULT '', `gender` int(11) NOT NULL DEFAULT '0', `job` varchar(255) NOT NULL DEFAULT '', `deptno` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`empno`), KEY `fk_deptno` (`deptno`) ) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8; LOCK TABLES `emp` WRITE; INSERT INTO `emp` VALUES (1,'陈一',1,'staff boss',1); INSERT INTO `emp` VALUES (2,'黄二',1,'technical boss',1); INSERT INTO `emp` VALUES (3,'张三',0,'human resouce',3); INSERT INTO `emp` VALUES (4,'李四',1,'developer leader',6); INSERT INTO `emp` VALUES (5,'王五',1,'clerk',10); INSERT INTO `emp` VALUES (6,'赵六',1,'clerk',6); INSERT INTO `emp` VALUES (7,'钱七',1,'executor',6); INSERT INTO `emp` VALUES (8,'孙八',1,'super man',6); INSERT INTO `emp` VALUES (9,'方九',0,'oh, god',6); INSERT INTO `emp` VALUES (10,'无名氏',0,'无语',6); UNLOCK TABLES; ALTER TABLE `emp` ADD CONSTRAINT `fk_deptno` FOREIGN KEY (`deptno`) REFERENCES `dept` (`deptno`);

下面建立web工程：

分别新建DeptModel,EmpModel,TreeModel和PageModel

DeptModel.java:

public class DeptModel { private int deptno; private String deptname; private int parentno; ... }

EmpModel.java:

public class EmpModel { private Integer empno; private String empname; private String gender; private String job; private Integer deptno; ... }

TreeModel.java，用于生成部门树的模型：

public class TreeModel { private int id; private String text; private boolean leaf; private List children = new ArrayList(0); public TreeModel(){ } /** * 根据部门列表获取形如 [{id:"",text:"",leaf:,children:[]},{...},...]的JSON字符串 * @param models 部门列表List * @return JSON格式的字符串，用于生成ext树 */ public String getJsonTreeModelString(List models){ List lst = new ArrayList(0); for(DeptModel dm : models){ if(dm.getParentno()==0){ TreeModel root = new TreeModel(); root.setId(dm.getDeptno()); root.setText(dm.getDeptname()); List children = getChildren(models,root); //递归获取子集 if(children.size()>0){ root.setLeaf(false); root.setChildren(children); }else{ root.setLeaf(true); root.setChildren(new ArrayList(0)); } lst.add(root); } } JsonConfig config = new JsonConfig(); config.setExcludes(new String[]{"models"}); config.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT); return JSONArray.fromObject(lst,config).toString(); } /** * 递归获取节点的子集的方法 * @param models 部门列表 * @param parentModel 根节点，即deptno=0的根节点部门 * @return List 树模型列表 */ public List getChildren(List models,TreeModel parentModel){ List lst = new ArrayList(0); for(DeptModel dm : models){ if(parentModel.getId() == dm.getParentno()){ TreeModel tm = new TreeModel(); tm.setId(dm.getDeptno()); tm.setText(dm.getDeptname()); List children = getChildren(models,tm); if(children.size()>0){ tm.setLeaf(false); tm.setChildren(children); }else{ tm.setLeaf(true); tm.setChildren(new ArrayList(0)); } lst.add(tm); } } return lst; } //省略getter,setter方法... }

PageModel.java，用于分页的模型：

public class PageModel { private int total; private List lst; ... }

下面添加工程对Extjs3.2的支持：

解压ext-3.2.0.zip到某个路径，复制adapter、pkgs、resource文件夹、ext-3.2.0/src/locale/ext-lang-zh_CN.js和ext-3.2.0/ext-all.js到WebRoot/js下面，这样就完成了对Extjs功能的支持。

接下来完成从数据库获取部门信息和人员信息并转换成JSON格式：

deptProcessor.jsp:

<%@ page language="java" pageEncoding="UTF-8"%> <%@ page import="com.model.TreeModel" %> <%@ page import="com.model.DeptModel" %> <%@ page import="java.sql.*,java.util.*" %> <% Class.forName("com.mysql.jdbc.Driver"); java.sql.Connection conn = java.sql.DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root"); PreparedStatement pstmt = conn.prepareStatement("select * from dept"); ResultSet rs = pstmt.executeQuery(); List models = new ArrayList(); while(rs.next()){ DeptModel model = new DeptModel(); model.setDeptno(rs.getInt("deptno")); model.setDeptname(rs.getString("deptname")); model.setParentno(rs.getInt("parentno")); models.add(model); } String jsonTreeModelString = new TreeModel().getJsonTreeModelString(models); out.println(jsonTreeModelString); %>

empProcessor.jsp:

<%@ page language="java" pageEncoding="UTF-8"%> <%@ page import="com.model.EmpModel" %> <%@ page import="com.model.PageModel" %> <%@ page import="net.sf.json.JSONObject" %> <%@ page import="java.sql.*,java.util.*" %> <% Integer deptno = -1; Integer start = 0; Integer limit = 0; if(request.getParameter("deptno") != null){ deptno = Integer.parseInt(request.getParameter("deptno").toString()); } if(request.getParameter("start") != null){ start = Integer.parseInt(request.getParameter("start").toString()); } if(request.getParameter("limit") != null){ limit = Integer.parseInt(request.getParameter("limit").toString()); } Class.forName("com.mysql.jdbc.Driver"); java.sql.Connection conn = java.sql.DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root"); PreparedStatement pstmt = conn.prepareStatement("select * from emp where deptno=? limit ? ,?"); pstmt.setInt(1,deptno); pstmt.setInt(2,start); pstmt.setInt(3,limit); ResultSet rs = pstmt.executeQuery(); List models = new ArrayList(); while(rs.next()){ EmpModel model = new EmpModel(); model.setEmpno(rs.getInt("empno")); model.setEmpname(rs.getString("empname")); model.setGender(rs.getInt("gender")==1?"男":"女"); model.setJob(rs.getString("job")); model.setDeptno(rs.getInt("deptno")); models.add(model); } pstmt = conn.prepareStatement("select count(*) from emp where deptno=?"); pstmt.setInt(1,deptno); rs = pstmt.executeQuery(); int total = 0; if(rs.next()){ total = rs.getInt(1); } PageModel pageModel = new PageModel(); pageModel.setTotal(total); pageModel.setLst(models); String jsonEmpModelString = JSONObject.fromObject(pageModel).toString(); out.println(jsonEmpModelString); %>

最后列用Extjs提供的TreePanel和Window,GridPanel分别显示部门和人员信息:

tree.jsp:

<%@ page language="java" pageEncoding="UTF-8"%>

在浏览器中输入 http://127.0.0.1:8080/Extjs/tree.jsp测试，效果如下：

哈哈，很简单吧。。。