How to parse received json data in action

Question

I am sending json array data from JSP to Action class for that I have included struts2-json-plugin. I want to parse it to receive it as a ArrayList elements. my code is

In JSP:

$.ajax({
        url: "UpdateNotification",
        dataType: "json",
        data: {ids: JSON.stringify(ids)},
        success: function(data) {
            alert("success " + data.st);
        }
    })

In action:

public class Test extends ActionSupport {
    ArrayList<String> ids = new ArrayList<String>();

        public ArrayList<String> getIds() {
            return ids;
        }

        public void setIds(ArrayList<String> ids) {
            this.ids = ids;
        }

        public String updateNotification() {
                 System.out.println("ID ARE " + getIds());
                    for (String a : getIds()) {
                        System.out.println("data " + a);
                    }
             }
      }

On running it is showing data

ID ARE [["25","27","28"]]
  data ["25","27","28"]

How can I get one data as one array element in action.

EDIT I am trying to get data as

ids(0)=25;
ids(1)=27;
ids(2)=28;

Which version of S2? Older versions of S2 json plugin don't support direct json arrays. Have you configured jsoninterceptor? — Aleksandr M, Aug 05 '15 at 10:38
NO I have not configured anything only included `struts2-json-plugin` — xrcwrn, Aug 05 '15 at 10:48
Do you really need json? Have you tried ajax with traditional like I told you in your previous question? — Aleksandr M, Aug 05 '15 at 10:54
I resolved that problem by adding appropriate `struts2-json-plugin` here I am sending array from ajax and yes I want to read it as json. — xrcwrn, Aug 05 '15 at 10:58
How you resolved it if you still can't do what you want? You don't need json to send array via ajax. Using json is just one of the ways to do it. — Aleksandr M, Aug 05 '15 at 11:03
Don't use raw ajax with `ajax()` call, use `post()` and `get()`. — Roman C, Aug 05 '15 at 11:30
possible duplicate of [How to get javascript array in Action](http://stackoverflow.com/questions/31805980/how-to-get-javascript-array-in-action) — Aleksandr M, Aug 05 '15 at 12:14
@RomanC Using http://stackoverflow.com/questions/31805980/how-to-get-javascript-array-in-action I find the way how to access data in Action But in this question I want to parse received data as arrayList element — xrcwrn, Aug 06 '15 at 04:58

Roman C · Accepted Answer · 2015-08-07T12:51:29.613

1

Json stringify method returns an array of values in json format something like ["25","27","28"]. But to convert to a list you need to remove [ or ] characters to submit CSV values. Because only CSV values could be converted to a list. Try

data: {ids: JSON.stringify(ids).replace(/[\[\]]/g,'')},

edited Aug 07 '15 at 12:51

answered Aug 06 '15 at 08:56

Roman C

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It is not replacing [ and ] getting the same value – xrcwrn Aug 06 '15 at 09:26
@xrcwrn Listen, I give you an idea and you try it yourself, I can't test it in my environment, but I know that replacement should work, and if it doesn't then you should test it. You can also let me know what's wrong with it and I will update the answer. – Roman C Aug 06 '15 at 09:32
No, It's not ok, I need my answers to be upvoted and accepted. If you don't want to help me why should I help you? – Roman C Aug 06 '15 at 09:42
I tried `data: {ids: JSON.stringify(ids).replace(/[\[\]-]/g, "")},` Which is removing `[]` but still in server it is showing `ID ARE ["25","27","28"] data "25","27","28"` – xrcwrn Aug 06 '15 at 10:01
It's correct, the `ArrayList` uses `toString()` to print this. What else do you need? And it's suspicious escaping, using regex in java you need to escape `\\` character. – Roman C Aug 06 '15 at 10:09
then how it will show ids(0)=25; ids(1)=27; ids(2)=28; – xrcwrn Aug 06 '15 at 10:11
Whare do you want to show it, in console? `System.out.println("ids("+i+")="+ids.get(i)+";");` – Roman C Aug 06 '15 at 10:15
No I wat receceive it in ArrayList as id(0) value=25 ans similar – xrcwrn Aug 06 '15 at 11:06
I want received data should be populated in arrayList ids like ids(0)=25; ids(1)=27; ids(2)=28; – xrcwrn Aug 06 '15 at 11:07
I didn't get, isn't it printed to the console? – Roman C Aug 06 '15 at 11:14
at server side ` System.out.println("data " + a);` printing data "25","27","28" – xrcwrn Aug 06 '15 at 11:17
This is because elements of the list is of type string, try `List`. – Roman C Aug 06 '15 at 11:19
Not Working it is giving value as string – xrcwrn Aug 07 '15 at 04:54
I don't understand what are you saying. – Roman C Aug 07 '15 at 08:11
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/85407/discussion-between-xrcwrn-and-roman-c). – xrcwrn Aug 07 '15 at 10:32

How to parse received json data in action

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