}
};
}();
同时再分析一个json：
[{"text":"衣服类",
"id":"5", //注意：这里是该节点的id，拼连接时要用到，与官方的json有所不同
"leaf":true,
"cls":"file",
"description":"这里是衣服类"}] //自定义只需要这样就可以了
给出java产生json的代码逻辑片断：
……
//list为由传入的id所求的category集合
List list=
findBy("parentId", new Long(parentId.toString()));
StringBuffer JSONStr = new StringBuffer(); //声明json
JSONStr.append("[");
for(CostCategory i : list){
boolean isLeaf = isLeaf(i.getId()); //isLeaf()为判断是否有以该id为parentId的节点，具体没有给出
String icon = isLeaf?"file":"folder";
String description = i.getCategoryDescription()==null?"":i.getCategoryDescription();
//{"text":"treedata.jsp","id":"treedata.jsp","leaf":true,"cls":"file"},
JSONStr.append("{"text":""+
i.getCategoryName()+"","id":""+
i.getId()+"","leaf":"+
isLeaf+","cls":""+
icon+"","description":""+
description+""},");
}
JSONStr.deleteCharAt(JSONStr.lastIndexOf(","));
JSONStr.append("]");
System.out.println(JSONStr);
out.print(JSONStr); //输出json
……
