Represent JSON as an array of objects in JAVA

Question

I would like to create a JSON string as an array of objects like this:

[
    {
        "alertid": "1",
        "alerttext": "This is test",
        "alertdate": "2010-02-11 09:03:40"
    },
    {
        "alertid": "2",
        "alerttext": "Another alert",
        "alertdate": "2010-02-11 09:11:04"
    }
]

The JAVA JSON objects put method looks like this: jsonObject.put(String key, Collection value);

When I enter my key and collection, my json looks like this:

{
    "JSONObject": [
        {
            "alertid": "1",
            "alerttext": "This is test",
            "alertdate": "2010-02-11 09:03:40"
        },
        {
            "alertid": "2",
            "alerttext": "Another alert",
            "alertdate": "2010-02-11 09:11:04"
        }
    ]
}

How can I get my json string to look like the first string when I am constrained to the signature of the put method?

Can you post your example class? Thanks

Tyler DeWitt
– Tyler DeWitt

2011-08-04 17:19:30 +00:00
Commented Aug 4, 2011 at 17:19 — Tyler DeWitt
– Tyler DeWitt, Commented Aug 4, 2011 at 17:19

lucas · Accepted Answer · 2011-08-04 17:28:29Z

2

If you're using the net.sf.json library, make yourself a JSONArray and put JSONObjects in it instead.

JSONArray array = new JSONArray();

JSONObject obj = new JSONObject();
obj.put("alertid","1");

array.add(obj);

answered Aug 4, 2011 at 17:28

lucas

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Mircea Nistor · Accepted Answer · 2011-08-04 17:29:45Z

2

What you need is a JSONArray that you can then fill with JSONObject's

Try something like this:

JSONArray arr = new JSONArray();
for (JSONObject item : collection)
{
    arr.put(item);
}

Or, if you already have a Collection of JSONObject's, you can simply write:

JSONArray arr = new JSONArray(yourFancyCollection);

Then, arr.toString() will look like you asked.

answered Aug 4, 2011 at 17:29

Mircea Nistor

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