看了“使用hibernate實現樹形結構無限級分類”這篇文章後，我也想將自己在所有開發的項目中使用的功能模組樹的實現方法以及完整DEMO(含源碼)貼出來和大家分享。其實在我的部落格裡是老早貼出來的，由於時間關係沒好好整理。
功能模組樹是幾乎在每個項目裡都要用到的東西，利用Dojo的好處就是可以實現樹的子節點的動態載入，這在樹節點很多的情況下是很有用的。
下載附件二dojotree.rar，解壓後將dist\dojotree.war部署到應用伺服器即可瀏覽DEMO，DEMO中內建HSQLDB資料庫，啟動時自動載入。DEMO運行截圖見附件一。
一、tree.jsp主要代碼
1、首先在head中匯入Dojo庫(dojo.js)和TreeWidget
<script>"text/javascript" src="ajax/dojo/dojo.js">
<script>"text/javascript">
dojo.require("dojo.widget.Tree");
dojo.require("dojo.widget.TreeNode");
dojo.require("dojo.widget.TreeSelector");
dojo.require("dojo.widget.TreeRPCController");
dojo.require("dojo.widget.TreeLoadingController");
dojo.require("dojo.widget.TreeContextMenu");
</script>
2、在body中放置TreeWidget，TreeLoadingController中的RPCUrl="treeServlet"為從後台擷取資料的servlet名稱，TreeNode中的expandLevel表示樹初始張開層級
<div dojoType="TreeLoadingController" RPCUrl="treeServlet" widgetId="treeController" DNDController="create"><!--</span-->div>
<div dojoType="TreeSelector" widgetId="treeSelector"><!--</span-->div>
<div dojoType="Tree" DNDMode="between" selector="treeSelector" widgetId="bandTree" controller="treeController">
<div dojoType="TreeNode" title="root" widgetId="root" objectId="root" isFolder="true" childIconSrc="images/comm.gif" expandLevel="1"/>
3、建立TreeSelector事件處理函數
function treeSelectFired() {
// get a reference to the treeSelector and get the selected node
var treeSelector = dojo.widget.manager.getWidgetById('treeSelector');
var treeNode = treeSelector.selectedNode;
// get a reference to the songDisplay div
var hostDiv = document.getElementById("songDisplay");
var isFolder = treeNode['isFolder'];
//alert(isFolder);
if ( !isFolder) {
var song = treeNode['title'];
var url = treeNode['url'];
link(url);
} else {
}
}
4、將select事件處理函數關聯到treeSelector
function init() {
//get a reference to the treeSelector
var treeSelector = dojo.widget.manager.getWidgetById('treeSelector');
//connect the select event to the function treeSelectFired()
dojo.event.connect(treeSelector,'select','treeSelectFired');
}
dojo.addOnLoad(init);
二、主要java代碼及資料結構
1、Gnmk.java中tree的屬性
private String id;
private String gnmkdm; //功能模組代碼
private String gnmksm; //功能模組說明
private String gnmktb; //功能模組表徵圖
private String gnmklj; //功能模組路徑
private String gnmkmc; //功能模組名稱
private String gnmksj; //功能模組上級代碼
private String gnmkbz; //功能模組標誌（‘N'為分葉節點）
2、HSQLDB記憶體資料庫載入SQL(db.sql)
CREATE TABLE GNMK (ID VARCHAR, GNMKDM VARCHAR, GNMKMC VARCHAR, GNMKLJ VARCHAR, GNMKTB VARCHAR, GNMKBZ VARCHAR, GNMKSJ VARCHAR);
INSERT INTO GNMK VALUES ('d098a59f0b765c30010b765d6b780001', '01', '一級目錄1', null, 'system.gif', 'Y', '');
INSERT INTO GNMK VALUES ('d098a59f0b765e68010b765fda830001', '0101', '二級目錄1', 'cxtjAction.do', 'system.gif', 'N', '01');
INSERT INTO GNMK VALUES ('d098a59f0b765e68010b765fda830001', '0102', '二級目錄2', 'cxtjAction.do', 'system.gif', 'N', '01');
INSERT INTO GNMK VALUES ('d098a59f0b765c30010b765d6b780002', '02', '一級目錄2', null, 'system.gif', 'Y', '');
INSERT INTO GNMK VALUES ('d098a59f0b765e68010b765fda830002', '0201', '二級目錄1', 'cxtjAction.do', 'system.gif', 'N', '02');
INSERT INTO GNMK VALUES ('d098a59f0b765e68010b765fda830002', '0202', '二級目錄2', 'cxtjAction.do', 'system.gif', 'Y', '02');
INSERT INTO GNMK VALUES ('d098a59f0b765e68010b765fda830002', '020201', '三級目錄1', 'cxtjAction.do', 'system.gif', 'N', '0202');
INSERT INTO GNMK VALUES ('d098a59f0b765e68010b765fda830002', '020202', '三級目錄2', 'cxtjAction.do', 'system.gif', 'N', '0202');
3、TreeServlet .java主要代碼，在getGnmkByParent(String gnmksj)方法中可以實現自己的業務，DEMO中使用GnmkDAO
public class TreeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String action = request.getParameter("action");
System.out.println("action b=>" + action);
System.out.println("action b=>" + action);
String data = request.getParameter("data");
if (action.equalsIgnoreCase("getChildren")) {
JSONTokener jsonTokener = new JSONTokener(data);
JSONObject jsonObject = (JSONObject) jsonTokener.nextValue();
JSONObject parentNodeObject = (JSONObject) jsonObject.get("node");
response.setContentType("text/json; charset=gb2312");
PrintWriter out = response.getWriter();
out.write(getChildren(parentNodeObject));
} else {
}
}
private String getChildren(JSONObject parentNodeObject) {
JSONArray result = new JSONArray();
String parentObjectId = parentNodeObject.getString("objectId");// id 唯一
// String parentWidgetId = parentNodeObject.getString("widgetId");// dm
parentObjectId = parentObjectId.equalsIgnoreCase("root") ? ""
: parentObjectId;
System.out.println("parentObjectId=>" + parentObjectId);
// 擷取子功能模組
List listGnmk = this.getGnmkByParent(parentObjectId);
System.out.println("listGnmk=>" + listGnmk.size());
if (listGnmk != null) {
Iterator itGnmk = listGnmk.iterator();
while (itGnmk.hasNext()) {
Gnmk qxgnmk = (Gnmk) itGnmk.next();
try {
JSONObject jsonGnmkObject = new JSONObject();
String gnmkbz = qxgnmk.getGnmkbz();
boolean isFolder = gnmkbz.equalsIgnoreCase("Y") ? true
: false;
jsonGnmkObject.put("title", qxgnmk.getGnmkmc());
jsonGnmkObject.put("isFolder", isFolder);
jsonGnmkObject.put("widgetId", qxgnmk.getGnmkdm());
jsonGnmkObject.put("objectId", qxgnmk.getGnmkdm());
jsonGnmkObject.put("childIconSrc", "images/"
+ qxgnmk.getGnmktb());
jsonGnmkObject.put("url", qxgnmk.getGnmklj());
result.put(jsonGnmkObject);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
return result.toString();
}
private List getGnmkByParent(String gnmksj) {
GnmkDAO gnmkDao = new GnmkDAO();
return gnmkDao.getGnmkByParent(gnmksj);
}
}
三、關於DEMO的其它配置說明
1、實現javax.servlet.ServletContextListener介面的contextInitialized方法來載入HSQLDB及其資料，ContextListener.java主要代碼
public void contextInitialized(ServletContextEvent event) {
try {
// load the driver
Class.forName("org.hsqldb.jdbcDriver");
// create the table and add sample data
InputStreamReader in = new InputStreamReader(getClass().getClassLoader().getResourceAsStream("db.sql"));
BufferedReader reader = new BufferedReader(in);
DBUtils.setupDatabase(reader);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
2、web.xml相關配置
<listener>
<listener-class>
dojo.sample.ContextListener
<!--<span class="tag"--><!--</span-->listener-class>
<!--</span-->>
下載
