一个 .<s:tree>方法：
1.引入新的标签：
<%@ taglib prefix="sd" uri="/struts-dojo-tags" %>
2.引入jar包：
struts2-dojo-plugin-2.2.3.jar
3.在<head>中增加
<sd:head/>
4.前台代码：
<sd:tree id="a" label="总公司">
<sd:treenode id="aa" label="北京分公司" />
<sd:treenode id="bb" label="上海分公司">
<sd:treenode id="bbb1" label="综合管理部" />
<sd:treenode id="bbb2" label="研发部" />
</sd:treenode>
<sd:treenode id="cc" label="深圳分公司" />
</sd:tree>
二.dtree方法（通过读取数据库中表显示到dtree）：
1.下载插件dtree。地址：http://download.csdn.net/detail/ahhmdwg/8132227
2.导入到你的web项目中：css文件和js文件放到你的项目中，将example01.html文件里的代码copy到你须要显示树形结构的jsp页面。
（1）建立数据库表：
CREATE TABLE `tree` ( `id` int(11) NOT NULL, `name` varchar(20) DEFAULT NULL, `parentId` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;（2）bean包下类：
package com.dwg.bean;
public class Tree {
private int id;
private String name;
private int parentId;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getParentId() {
return parentId;
}
public void setParentId(int parentId) {
this.parentId = parentId;
}
} （3）dao层运行的自己定义sql：
public List<?> getTreeList(final String sql) { // TODO Auto-generated method stub return (List<?>) this.getHibernateTemplate().execute( new HibernateCallback() { public Object doInHibernate(final Session session) throws HibernateException, SQLException { final SQLQuery query = session.createSQLQuery(sql); return query.list(); } }); }
（4）action类：
public String execute() throws Exception{
String sql = "select * from tree";
list = this.treeService.getTreeList(sql);
Map request = (Map) ActionContext.getContext().get("request");
System.out.println("----list1----");
request.put("list", list);
System.out.println("----list2----");
return SUCCESS;
}（5）struts.xml文件配置
<package name="dtree" namespace="/dtree" extends="struts-default">
<action name="dtree" class="TreeAction">
<result name="success">/dtree.jsp</result>
</action>
</package>（6）index.jsp页面：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<base href="<%=basePath%>">
<title>Insert title here</title>
<sd:head/>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<a href="<%=basePath%>dtree/dtree.action">DtreeDemo</a>
</body>
</html> dtree.jsp页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<base href="<%=basePath%>">
<title>Destroydrop » Javascripts » Tree</title>
<link rel="StyleSheet" href="<%=basePath%>css/dtree.css" type="text/css" />
<script type="text/javascript" src="<%=basePath%>script/dtree.js"></script>
</head>
<body>
<h1><a href="/">Destroydrop</a> » <a href="/javascripts/">Javascripts</a> » <a href="/javascripts/tree/">Tree</a></h1>
<h2>Example</h2>
<div class="dtree">
<p><a href="javascript: d.openAll();">open all</a> | <a href="javascript: d.closeAll();">close all</a></p>
<script type="text/javascript">
d = new dTree('d');
//构造根节点
d.add(0,-1,'idada');
<s:iterator value="list" id="us">
d.add(<s:property value="#us[0]"/>,<s:property value="#us[2]"/>,'<s:property value="#us[1]"/>','dtree.jsp');
</s:iterator>
document.write(d);
</script>
</div>
<p><a href="mailto:drop@destroydrop.com">©2002-2003 Geir Landrö</a></p>
</body>
</html>（7）文件夹结构截图：
执行效果：
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