Java 循环遍历 Json 数组？
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Java loop over Json array?
提问by Alosyius
I am trying to loop over the following JSON
我正在尝试遍历以下内容 JSON
{
"dataArray": [{
"A": "a",
"B": "b",
"C": "c"
}, {
"A": "a1",
"B": "b2",
"C": "c3"
}]
}
What i got so far:
到目前为止我得到了什么：
JSONObject jsonObj = new JSONObject(json.get("msg").toString());
for (int i = 0; i < jsonObj.length(); i++) {
JSONObject c = jsonObj.getJSONObject("dataArray");
String A = c.getString("A");
String B = c.getString("B");
String C = c.getString("C");
}
Any ideas?
有任何想法吗？
采纳答案by Sotirios Delimanolis
In your code the element dataArrayis an array of JSON objects, not a JSON object itself. The elements A, B, and Care part of the JSON objects inside the dataArrayJSON array.
在您的代码中，元素dataArray是一个 JSON 对象数组，而不是 JSON 对象本身。元素A、B和C是dataArrayJSON 数组中JSON 对象的一部分。
You need to iterate over the array
您需要遍历数组
public static void main(String[] args) throws Exception {
String jsonStr = "{ \"dataArray\": [{ \"A\": \"a\", \"B\": \"b\", \"C\": \"c\" }, { \"A\": \"a1\", \"B\": \"b2\", \"C\": \"c3\" }] }";
JSONObject jsonObj = new JSONObject(jsonStr);
JSONArray c = jsonObj.getJSONArray("dataArray");
for (int i = 0 ; i < c.length(); i++) {
JSONObject obj = c.getJSONObject(i);
String A = obj.getString("A");
String B = obj.getString("B");
String C = obj.getString("C");
System.out.println(A + " " + B + " " + C);
}
}
prints
印刷
a b c
a1 b2 c3
I don't know where msgis coming from in your code snippet.
我不知道msg你的代码片段来自哪里。
回答by Jaydeep Patel
Java Docs to the rescue:
Java Docs 来救援：
You can use http://www.json.org/javadoc/org/json/JSONObject.html#getJSONArray(java.lang.String)instead
您可以使用http://www.json.org/javadoc/org/json/JSONObject.html#getJSONArray(java.lang.String）代替
JSONArray dataArray= sync_reponse.getJSONArray("dataArray");
for(int n = 0; n < dataArray.length(); n++)
{
JSONObject object = dataArray.getJSONObject(n);
// do some stuff....
}
