JSONObject和JSONArray的API链接:
1、识别json格式字符串是JSONObject还是JSONArray
JSON数据格式只有两种形式,分别是:
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{
"key"
:
"value"
}
//JSONObject(对象)
[{
"key1"
:
"value1"
}, {
"key2"
:
"value2"
}]
//JSONArray(数组)
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JSONObject可以用key取值,JSONArray只能遍历取值
2、遍历json数组
假设我们得到的json字符串result如下:
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{
"feature"
:
"fresh_today"
,
"photos"
:[
{
"id"
:
40581634
,
"name"
:
"Dandelion 5"
},
{
"id"
:
40581608
,
"name"
:
"Dandelion 3"
}
]
}
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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:
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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);
int
id = object.getInt(
"id"
);
String name = object.getString(
"name"
);
}
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附上一个很好用的在线json格式化和校验的网站:http://jsonformatter.curiousconcept.com/