1.json的格式，有两种：
{"key": "value"} //JSONObject(对象)
[{"key1": "value1"}, {"key2": "value2"}] //JSONArray(数组)
2.json的遍历
假如json字符串如下:
{
"feature":"fresh_today",
"photos":[
{
"id":40581634,
"name":"Dandelion 5"
},
{
"id":40581608,
"name":"Dandelion 3"
}
]
}
可以看出来，最外面是个json对象，photos节点是个数组，遍历代码如下：
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
JSONObject jsonObject = JSONObject.fromObject(result);
String feature = jsonObject.getString("feature");
JSONArray photoArray = jsonObject.getJSONArray("photos");
for (int i = 0; i < photoArray.size(); i++) {
JSONObject object = (JSONObject) photoArray.get(i);
//或者用如下代码获取JSONObject
//JSONObject object = JSONObject.fromObject(photoArray.get(i));
int id = object.getInt("id");
String name = object.getString("name");
}
附上一个很好用的在线json格式化和校验的网站：http://jsonformatter.curiousconcept.com/