java JSONObject.append into object - 结果是嵌套数组？
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JSONObject.append into object - result is nested array?
提问by Suma
Following code produces a nested array as a result for keys containing three items:
以下代码为包含三个项目的键生成一个嵌套数组：
import org.codehaus.jettison.json.JSONObject;
// ...
JSONObject ret = new JSONObject();
for (Key key:keys) ret.append("blocked",key.id());
The result is:
结果是：
{"blocked": [[["1"],"2"],"3"]}
Is this expected? If it is, how can I construct a plain array adding item by item?
这是预期的吗？如果是，我如何构建一个逐项添加的普通数组？
回答by legege
You need to create a JSONArrayobject:
您需要创建一个JSONArray对象：
JSONObject ret = new JSONObject();
JSONArray arr = new JSONArray();
arr.put("1");
arr.put("2");
arr.put("3");
ret.put("blocked", arr);
The result is:
结果是：
{"blocked":["1","2","3"]}
回答by Thomas
It's curious because the API says the following:
这很奇怪，因为API 说明如下：
Append values to the array under a key. If the key does not exist in the
JSONObject, then the key is put in theJSONObjectwith its value being aJSONArraycontaining the value parameter. If the key was already associated with aJSONArray, then the value parameter is appended to it.
将值附加到键下的数组。如果该键不存在于 中
JSONObject，则该键被放入 中JSONObject，其值为JSONArray包含 value 参数的 a。如果键已经与 a 关联JSONArray，则 value 参数会附加到它。
But it doesn't work correctly. When I do:
但它不能正常工作。当我做：
JSONObject o = new JSONObject();
o.append("arr", "123");
o.append("arr", "456");
I get an Exception saying that "JSONObject[arr] is not a JSONArray". It looks like there is a bug.
我收到一个异常，说“ JSONObject[arr] is not a JSONArray”。看起来有一个错误。
回答by buttonius
I ran into a similar problem. You should use the putmethod; not the appendmethod. And, of course, you should create a JSONArrray and use that as the second argument of the putmethod.
我遇到了类似的问题。你应该使用put方法；不是append方法。当然，您应该创建一个 JSONArrray 并将其用作put方法的第二个参数。
