对于json数据的应用01

1、通过访问接口返回一组json格式的数据。

例子如下：

String aa = "{"result":"1","roleinfo":[{"gender":"f","name":"%E4%B8%80%E5%8C%BA%E7%AC%AC%E4%B8%80","grade":5,"profession":"%E8%90%9D%E8%8E%89","createDate":"2013-04-25 09:28:24","playerforce":"668"},{"gender":"f","name":"%E4%B8%80%E5%8C%BA%E7%AC%AC%E4%BA%8C","grade":1,"profession":"%E8%90%9D%E8%8E%89","createDate":"2013-04-25 09:40:09","playerforce":"210"},{"gender":"f","name":"%E4%B8%80%E5%8C%BA%E7%AC%AC%E4%B8%89","grade":1,"profession":"%E8%90%9D%E8%8E%89","createDate":"2013-04-25 09:40:38","playerforce":"210"},{"gender":"f","name":"%E4%B8%80%E5%8C%BA%E7%AC%AC%E5%9B%9B","grade":1,"profession":"%E8%90%9D%E8%8E%89","createDate":"2013-04-25 09:41:02","playerforce":"210"}]}";

解释：返回值是一个对象，里面有两个参数result和roleinfo。roleinfo的内容是json数组。

2、将字符串转换成json对象。

JSONObject bb= JSONObject.fromObject(aa);

3、再将bb中的roleinfo截出来，放进json数组中。

JSONArray cc= JSONArray.fromObject(bb.getString("roleinfo"));

4、读cc中的属性name。

String dd ="";

for(int i=0;i<cc.size();i++)
{
        JSONObject dd= JSONObject.fromObject(cc.getString(i));
        ee+= java.net.URLDecoder.decode(dd.getString("name"),"UTF-8")+",";//转换格式
}