xtree 的异步加载

其实呢，刚开始打算做的是静态的加载，但是，发现自己后台构建树的时间太长了，所以就放弃了，改成了异步加载，自己也是刚接触，看代码吧，很多都是copy的。
把xtree的文件夹放到项目中，然后再页面中引入js，css.
先见一个页面：
webFXTreeConfig.rootIcon = "<%=request.getContextPath()%>/xtree/images/folder.png";
webFXTreeConfig.openRootIcon = "<%=request.getContextPath()%>/xtree/images/openfolder.png";
webFXTreeConfig.folderIcon = "<%=request.getContextPath()%>/xtree/images/folder.png";
webFXTreeConfig.openFolderIcon = "<%=request.getContextPath()%>/xtree/images/openfolder.png";
webFXTreeConfig.fileIcon = "<%=request.getContextPath()%>/xtree/images/file.png";
webFXTreeConfig.lMinusIcon = "<%=request.getContextPath()%>/xtree/images/Lminus.png";
webFXTreeConfig.lPlusIcon = "<%=request.getContextPath()%>/xtree/images/Lplus.png";
webFXTreeConfig.tMinusIcon = "<%=request.getContextPath()%>/xtree/images/Tminus.png";
webFXTreeConfig.tPlusIcon = "<%=request.getContextPath()%>/xtree/images/Tplus.png";
webFXTreeConfig.iIcon = "<%=request.getContextPath()%>/xtree/images/I.png";
webFXTreeConfig.lIcon = "<%=request.getContextPath()%>/xtree/images/L.png";
webFXTreeConfig.tIcon = "<%=request.getContextPath()%>/xtree/images/T.png";
webFXTreeConfig.blankIcon = "<%=request.getContextPath()%>/xtree/images/blank.png";

                       var tree = new WebFXTree("XXXX");
tree.add(new WebFXLoadTreeItem("XXXXXX", "http://localhost:8080/servelt/..action"));//树的展开
                   document.write(tree);
然后去写一个action，里面只不过是构建了一个xml，构建xml的时候是什么插件都没有用，
在action中
response.setContentType("text/xml;charset=UTF-8");
    response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
PrintWriter out = response.getWriter();

然后就是构建xml，弄一个stringBuffer 一个一个的添加就行了，但是一定要设置
<xml>
<test src="跳转的action" action="展现的action" target=“展现action页面出现的位置”>
</test>
</xml>
然后
out.println(这个stringBuffer);
    out.flush();
    out.close();
这颗树就算构建完了，然后可以直接访问这个页面
简单的就算完事了。