最近需要用一個在網頁上顯示一個樹形的結構，原來的javascript腳本不是很適合，就是用了xloadtee，這個東西還是很好用的，

雖然還有一點點瑕疵，但是已經很好的達到了我的要求。

大概需要做的工作：

腳本引用：

<link type="text/css" rel="stylesheet" href="<%=request.getContextPath()%>/js/xtree2.css">
<link type="text/css" rel="stylesheet" href="<%=request.getContextPath()%>/js/xtree2.links.css">
<script type="text/javascript" src="<%=request.getContextPath()%>/js/xtree2.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/js/xloadtree2.js"></script>

使用個div在頁面顯示整個樹：

<div style="position: absolute; width: 200px; top: 10px; left: 15px; height: 100%; padding: 5px; overflow: auto;">

<!-- js file containing the tree content, edit this file to alter the menu,
     the menu will be inserted where this tag is located in the document -->
<script type="text/javascript">

var tree = new WebFXTree("組織結構樹");
tree.showRootNode = false;
tree.showRootLines = false;
tree.add(new WebFXLoadTreeItem("系統(tǒng)", "/sectiontree.do"));
tree.expandAll();
tree.write();
</script>

</div>

 

頁面部分即可完成，下面是服務器端的代碼：

 

 public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {

  response.setContentType("text/xml; charset=gbk");
  response.setHeader("Cache-Control", "no-cache");
  response.setDateHeader("Expires", 0);
  PrintWriter out = response.getWriter();
  String id = request.getParameter("id");
  Session ss = SessionHolder.getSessionHolder().currentSession();
  Document doc = new Document(new Element("tree"));
  if (id == null) {
   // 取得根節(jié)點
   String root = "select s from Section s inner join fetch s.children where s.parent.section_id is null";
   Query query = ss.createQuery(root);
   transfer(doc, query);
  } else {
   // 取得當前節(jié)點的id
   int sid = Integer.parseInt(id);
   String child = " from Section s where s.section_id=:id";
   Query query = ss.createQuery(child);
   query.setInteger("id", sid);
   transfer(doc, query);
  }

  SessionHolder.getSessionHolder().closeSession(ss);
  Format format = Format.getCompactFormat();
  format.setEncoding("gbk");
  format.setIndent("\t");
  XMLOutputter xout = new XMLOutputter(format);
  xout.output(doc, out);

  out.flush();
  out.close();
  return null;

 }

 private void transfer(Document doc, Query query) {
  List r = query.list();
  Section s = (Section) HibernateUtil.uniqueResult(r);

  for (Iterator it = s.getChildren().iterator(); it.hasNext();) {
   Section one = (Section) it.next();
   Element tree = doc.getRootElement();
   Element inner = new Element("tree").setAttribute("text", one
     .getName());
   tree.addContent(inner);
   if (!one.isLast())
    inner.setAttribute("src", "/TechCS/sectiontree.do?id="
      + one.getSection_id());

   inner.setAttribute("action", "javascript:setsection("
     + one.getSection_id() + ")");
  }
 }

以上部分就可以完成樹結構的服務器部分。

說明：使用struts+hibernate。