struts2中用ext框架显示树（tree）形菜单
?1、首先导入 ext3框架。
?2、创建 Syllabus类，列出在教学大纲案例中所需要的字段，同时也是在节点中显示的内容所需要的字段。
?
package com.erong.struts.json.domain;public class Syllabus {private String id;private String text;private String nodeParentId;private int nodeLevel;private String nodeCode;private boolean leaf;}3、写一个SyllabusService类，利用类中的getChildrens（）发放，取得数据库里的信息，在节点处显示。
?
?
package com.erong.struts.json.service;import java.util.List;import org.hibernate.classic.Session;import com.erong.struts.json.domain.Syllabus;import com.erong.struts.json.util.HibernateUtil;public class SyllabusService {public List<Syllabus> getChildrens(String nodeId) {Session session = HibernateUtil.getSessionFactory().getCurrentSession();session.beginTransaction();Syllabus syllabus = (Syllabus) session.load(Syllabus.class, nodeId);return session.createQuery("from Syllabus where subString (nodeCode,1,2*"+ syllabus.getNodeLevel() + ")='"+ syllabus.getNodeCode() + "'and nodeLevel="+ (syllabus.getNodeLevel() + 1)+ " order by nodeCode asc ").list();}}??
4、取得数据库信息要利用hibernate，
?当然要配置相应的信息：hibernate.cfg.xml和DomainMapping.hbm.xml两个xml文件。
<hibernate-mapping package="com.erong.struts.json.domain"> <class name="Syllabus" table="syllabus"> <id name="id" column="syllabus_id"> <generator /> </id> <property name="text" column="syllabus_name"/> <property name="nodeParentId" column="parent_id"/> <property name="nodeLevel" column="syllabus_depth"/> <property name="nodeCode" column="syllabus_code"/><property name="leaf" column="is_leaf" type="yes_no" /> </class></hibernate-mapping>?
?
5、要利用struts来控制页面，首先要创建action。用类JsonAction中的execute()方法，
调用SyllabusService中的getChildrens()方法，获取数据信息。当然此处也要在action中配置此信息。
?
package com.erong.struts.json.action;import java.util.List;import com.erong.struts.json.domain.Syllabus;import com.erong.struts.json.service.SyllabusService;import com.opensymphony.xwork2.ActionSupport;public class JsonAction extends ActionSupport {private String node;private List<Syllabus> nodes;public String getNode() {return node;}public void setNode(String node) {this.node = node;}public List<Syllabus> getNodes() {return nodes;}public void setNodes(List<Syllabus> nodes) {this.nodes = nodes;}public String execute() {SyllabusService ss = new SyllabusService();this.nodes = ss.getChildrens(node);System.out.println("select node id:" + node);System.out.println("元素个数:" + this.nodes.size());return SUCCESS;}}??
6、自定义结果的显示。创建MyJsonResult类来设置结果集的效果。
package com.erong.struts.json.util;import java.util.List;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONArray;import net.sf.json.JSONSerializer;import org.apache.struts2.dispatcher.StrutsResultSupport;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.util.ValueStack;public class MyJsonResult extends StrutsResultSupport {protected void doExecute(String finalLocation, ActionInvocation invocation)throws Exception {HttpServletResponse response = (HttpServletResponse) invocation.getInvocationContext().get(HTTP_RESPONSE);ValueStack vs = invocation.getStack();List list = (List) vs.findValue("nodes");System.out.println("自定义结果获得的元素个数：" + list.size());JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(list);System.out.println(jsonArray.toString());response.setCharacterEncoding("utf-8");response.getWriter().print(jsonArray.toString());}}??
7、最后就是js显示页面，创建index.html，在html页面中调用ext中的js，美化一下美观。
同时也要写js方法，来获取数据信息。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>New Web Project</title><link rel="stylesheet" type="text/css" href="ext3/resources/css/ext-all.css" /> <!-- GC --> <!-- LIBS --><script type="text/javascript" src="ext3/adapter/ext/ext-base.js"></script> <script type="text/javascript" src="ext3/ext-all.js"></script><script type="text/javascript" src="ext3/src/locale/ext-lang-zh_CN.js"></script><script language="JavaScript" type="text/javascript">var tree;function initTree() {var tree = new Ext.tree.TreePanel({loader: new Ext.tree.TreeLoader({dataUrl: '/Struts2Json/JsonDemo.action'})});var rootNode = new Ext.tree.AsyncTreeNode({text:'教学大纲', id:'44417711639f42edb25798368ed11b06'});tree.setRootNode(rootNode);return tree;}Ext.onReady(function() {Ext.BLANK_IMAGE_URL = 'ext3/resources/images/default/s.gif';//初始化Ext状态管理器，此类可返回用户在Cookie中的操作状态 Ext.state.Manager.setProvider(new Ext.state.CookieProvider());tree = initTree();var viewport = new Ext.Viewport({layout: "border",items: [{region: "north", height: 80, split: false},{region: "west", layout: "fit", width:300, minWidth: 180, title:"导航树", collapsible: true, split: true, items:[tree]},{region: "center", layout: "fit", items:[{}]}]});tree.expandAll();})</script> </head> <body> </body></html>?8、表结构在下面的Sysllabus.sql文件中。
1 楼 oyj86 2011-10-21 能发下源码给我么，email:247427748@qq.com,谢谢