检查中存在的JSON对象 [英] Check if an object exists in JSON

问题描述

我需要知道如果在一个JSON字符串存在并做取决于物体的存在不同的事情的对象。如果它不存在，我想省略对象，因为它抛出NullPonterException。我已经尝试过使用如果，但没有成功......可有人告诉我，我怎么能检查对象是否存在？

I need to know if an object exists in a JSON string and do different things depending on the existence of that object. If it doesn't exist, I want omit the object because it throws NullPonterException. I've tried using if but no success... Can someone tell me how can I check the existence of an object?

感谢你在前进！

推荐答案

尝试类似如下：

String jsonString = yourJsonString;
String nameOfObjectInQuestion = "yourObjectInQuestion";
JSONObject json = null;
JSONObject objectInQuestion = null;
try { 
    json = new JSONObject(jsonString); 
    objectInQuestion = json.getJSONObject(nameOfObjectInQuestion);
} 
catch (JSONException ignored) {}

if (objectInQuestion == null) {
    // Stomp your feet
}
else {
    // Clap your hands
}

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