Java循环遍历Json数组

发布于09月26日

我正在try 遍历下面的JSON

{
    "dataArray": [{
        "A": "a",
        "B": "b",
        "C": "c"
    }, {
        "A": "a1",
        "B": "b2",
        "C": "c3"
    }]
}

到目前为止我得到的是:

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");

}

有什么 idea 吗？

推荐答案

In your code the element dataArray is an array of JSON objects, not a JSON object itself. The elements A, B, and C are part of the JSON objects inside the dataArray JSON array.

You need to iterate over the array

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