java 如何从json对象获取字符串列表
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How to get list of strings from json object
提问by lenka
I have the following JSON:
我有以下 JSON：
{"errors":[{"code":888,"errorId":"xxx","message":"String value expected","fields":["name", "address"]}, {}, {}]}
I want to be able to get "fields" the following way:
我希望能够通过以下方式获得“字段”：
public static String getField(json, errorsIndex, fieldIndex) {
JSONObject errorJson = json.getJSONArray("errors").getJSONObject(errorIndex);
String value = errorJson.[getTheListOfMyFields].get(fieldIndex);
return value;
}
But I can't find a way to make this part [getTheListOfMyFields]. Any suggestion?
但是我找不到制作这部分 [getTheListOfMyFields] 的方法。有什么建议吗？
回答by gla3dr
Instead of getting a List<String>from the JSON Object, you can access the array of fields in the same way you are accessing the array of errors:
List<String>您可以像访问错误数组一样访问字段数组，而不是从 JSON 对象中获取 a ：
public static String getField(json, errorsIndex, fieldIndex) {
JSONObject errorJson = json.getJSONArray("errors").getJSONObject(errorIndex);
String value = errorJson.getJSONArray("fields").getString(fieldIndex);
return value;
}
Note that get(fieldIndex)has changed to getString(fieldIndex). That way you don't have to cast an Object to a String.
请注意，get(fieldIndex)已更改为getString(fieldIndex). 这样你就不必将对象转换为字符串。
