Java 在 json simple 中从 root 遍历 JSONObject
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Iterate through JSONObject from root in json simple
提问by PixMach
I am trying to iterate over a json object using json simple. I have seen answers where you can do a getJSONObject("child")from
我正在尝试使用 json simple 遍历 json 对象。我已经看到了你可以getJSONObject("child")从哪里做的答案
{ "child": { "something": "value", "something2": "value" } }
But what if I just have something
但如果我只是有一些东西
{
"k1":"v1",
"k2":"v2",
"k3":"v3"
}
And want to iterate over that jsonobject. This:
并且想要迭代那个json对象。这个：
Iterator iter = jObj.keys();
Throws:
抛出：
cannot find symbol
symbol : method keys()
location: class org.json.simple.JSONObject
采纳答案by M Anouti
Assuming your JSON object is saved in a file "simple.json", you can iterate over the attribute-value pairs as follows:
假设您的 JSON 对象保存在文件“simple.json”中，您可以按如下方式遍历属性值对：
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("simple.json"));
JSONObject jsonObject = (JSONObject) obj;
for(Iterator iterator = jsonObject.keySet().iterator(); iterator.hasNext();) {
String key = (String) iterator.next();
System.out.println(jsonObject.get(key));
}
回答by Ratnesh Kumar
You can do like this
你可以这样做
String jsonstring = "{ \"child\": { \"something\": \"value\", \"something2\": \"value\" } }";
JSONObject resobj = new JSONObject(jsonstring);
Iterator<?> keys = resobj.keys().iterator();
while(keys.hasNext() ) {
String key = (String)keys.next();
if ( resobj.get(key) instanceof JSONObject ) {
JSONObject xx = new JSONObject(resobj.get(key).toString());
Log.d("res1",xx.getString("something"));
Log.d("res2",xx.getString("something2"));
}
}
回答by Saurabh Verma
In Java 8 we can use lambdas
在 Java 8 中，我们可以使用 lambdas
void handleJSONObject(JSONObject jsonObject) {
jsonObject.keys().forEachRemaining(key -> {
Object value = jsonObject.get(key);
logger.info("Key: {0}\tValue: {1}", key, value);
}
}
