struts2 ext2 树！（online等）

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struts2 ext2 树！（online等）30

这是ext2.0的代码

  <script type="text/javascript">
		Ext.onReady(function(){
			var Tree = Ext.tree;
			
 	     	var tree = new Ext.tree.TreePanel({
			    el:'tree-div',
			    autoScroll : true,
            	animate : true,
	            enableDD : true,
    	        containerScroll : true,
	            loader : new Tree.TreeLoader({
                  dataUrl : 'initialize.action'
    	        })
			});
			
			var root = new Ext.tree.AsyncTreeNode({
				text:'ASK123',
				draggable : false,
		        id:'0000'
			});
			
			tree.setRootNode(root);
			
     		tree.render();

      		root.expand();
		});
		</script>

这是java代码

   public String execute() throws Exception {
		// ...
		list = moduleService.findBySjmkm(this.node);
		if(list != null && list.size() > 0){
		    boolean isFirst = true;
            int last = list.size();
            int count = 0;
            for (int i = 0; i < list.size(); i++) {
            	Module m = (Module) list.get(i);
            	 if (count == 0) {
                     this.setJsonString("[{\"text\" :\"" + m.getMc() + "\" ,\"id\" :\"" + m.getBh()
                                   + "\" ,\"cls\" :\"folder\"} ");
              } else if (i == (last - 1)) {
                     this.setJsonString(this.getJsonString() + ",{\"text\" :\"" + m.getMc() + "\" ,\"id\" :\""
                                   + m.getBh() + "\" ,\"cls\" :\"folder\"}]");
              } else {
                     this.setJsonString(this.getJsonString() + ",{\"text\" :\"" + m.getMc() + "\" ,\"id\" :\""
                                   + m.getBh() + "\" ,\"cls\" :\"folder\"}");
              }
            	count++;
			}
            System.out.println(this.getJsonString());
		}
		return SUCCESS;
	}

java代码里json我打出来是这个格式
[{"text" :"ALA管理" ,"id" :"5500" ,"cls" :"folder"} ,{"text" :"行销管理" ,"id" :"6100" ,"cls" :"folder"},{"text" :"财务管理" ,"id" :"7000" ,"cls" :"folder"},{"text" :"案件管理" ,"id" :"9000" ,"cls" :"folder"},{"text" :"系统" ,"id" :"1100" ,"cls" :"folder"},{"text" :"电子商务平台" ,"id" :"1300" ,"cls" :"folder"},{"text" :"会员管理" ,"id" :"3100" ,"cls" :"folder"},{"text" :"决策分析" ,"id" :"8010" ,"cls" :"folder"},{"text" :"协同办公平台" ,"id" :"8510" ,"cls" :"folder"},{"text" :"公开班管理" ,"id" :"1501" ,"cls" :"folder"},{"text" :"加盟商合作接口" ,"id" :"668471" ,"cls" :"folder"}]
======================================
现在问题是前台树只出来一个根节点，得不到后台的数据，但是我吧数据源dataUrl : 'initialize.action'换成一个txt文本，文本里面写action得到的json却可以！到手帮小弟解决一下啊！!

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