JSF Tree学习...

RAD7.0开发Faces Portlet.使用到Tree组件.
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使用JSF中的<ig:Sidebar></ig:Sidebar>实现动态加载菜单，其中bar.getChildren().add(aSidebarGroup);是实现动态加载首节点，HtmlSidebarGroup aSidebarGroup = (HtmlSidebarGroup) application.createComponent(HtmlSidebarGroup.COMPONENT_TYPE);
    aSidebarGroup.setText(boardName);
    aSidebarGroup.setExpanded(true);
    aSidebarGroup.setId(viewRoot.createUniqueId());实现加载该节点下的子节点，非常方便。

private Sidebar buildSideBar(Sidebar bar)
 {
  boolean isInitialised = bar.getAttributes().get("IS_INITIALISED")!=null;
  
  if (!isInitialised) {
   // Get a reference to the JSF Application,
   // we need it to create value bindings later-on
   Application application = FacesContext.getCurrentInstance().getApplication();
   UIViewRoot viewRoot = FacesContext.getCurrentInstance().getViewRoot();
   
   /* Create Infragistics SidebarGroup */
   // Set the Sidebar's width and height
   bar.getAttributes().put("style"," 155px; height: 590px;");
   // Create SidebarGroup
   List list = this.getBoardNameForMenu();
   for(int i = 0 ;i<list.size();i++)
   {
    Object[] row = (Object[])list.get(i);
   //Object[] row = (Object[])list.listIterator().next();
    String boardId = String.valueOf(row[0]);
    String boardName = String.valueOf(row[1]);
    String parentId = String.valueOf(row[2]);
    HtmlSidebarGroup aSidebarGroup = (HtmlSidebarGroup) application.createComponent(HtmlSidebarGroup.COMPONENT_TYPE);
    aSidebarGroup.setText(boardName);
    aSidebarGroup.setExpanded(true);
    aSidebarGroup.setId(viewRoot.createUniqueId());
   
    // Add the newly created SidebarGroup to the Sidebar's children list
    bar.getChildren().add(aSidebarGroup);
    
    List ls = this.getBoardNameForMenuBar(Integer.parseInt(boardId));
    if(ls.size() != 0)
    {
     for(int j=0;j<ls.size();j++)
     {
      Object[] row1 = (Object[])ls.get(j);
      String boardid = String.valueOf(row1[0]);
      String boardname = String.valueOf(row1[1]);
      //HtmlSidebarGroup aSidebarGroup = (HtmlSidebarGroup) application.createComponent(HtmlSidebarGroup.COMPONENT_TYPE);
      HtmlLink aLink1 = (HtmlLink)application.createComponent(HtmlLink.COMPONENT_TYPE);
      aLink1.setId(viewRoot.createUniqueId());
      //aSidebarGroup.setText(sidebarGroupNameStr);
      //aSidebarGroup.setExpanded(true);
      //aSidebarGroup.setId(viewRoot.createUniqueId());
      //aLink1.setId(parentId);
      aLink1.setUrl("/pages/bbs/visitor/topic/topicforboard.jsf?boardid="+boardid+"");
      aLink1.setValue(boardname);
      aSidebarGroup.getChildren().add(aLink1);
     }
    }
    
   }