如何排序的Java JSON对象数组 [英] How to sort array of json objects in java

问题描述

我在jsonarray 2 JSON对象，像这样

i have two json objects in jsonarray like this

"errorCode": "1",
"data": [
    {
        "messageId": 590,
        "message": "WvZiT3RPm7feC6Hxsa/Ing==",
        "messageType": "CHAT",
        "sentOn": "01:51 PM, Apr 06, 2013",

        "mainParent": 589,
        "officeId": "19",
        "webParent": 590
    },
    {
        "messageId": 589,
        "message": "1A45rtoC3Cy88h73TEvDqQ==",
        "messageType": "CHAT",
        "sentOn": "01:50 PM, Apr 06, 2013",

        "parent": 0,
        "signImg": null,
        "mainParent": 589,
        "officeId": "19",
        "webParent": 1
    }
]

所以我要在基于消息的ID键升序排列。我试着用用比较的对象类型为JSON对象，我收到错误的compareTo方法。请建议我

so i want to sort in ascending order based on message id key. i tried with comparator with object type as json object, i am getting error in compareto method. please suggest me

推荐答案

我张贴的答案在这里帮助别人谁所面临的问题，这类问题。

I am posting the answer here helping others who are facing the issue with this kind of problems.

public static JSONArray getSortedList(JSONArray array) throws JSONException {
            List<JSONObject> list = new ArrayList<JSONObject>();
            for (int i = 0; i < array.length(); i++) {
                    list.add(array.getJSONObject(i));
            }
            Collections.sort(list, new SortBasedOnMessageId());

            JSONArray resultArray = new JSONArray(list);

            return resultArray;
}

的code这部分将有助于JSON数组排序

This part of the code will help to sort the json array

退房SortBasedOnMessageId类下面。

Check out the SortBasedOnMessageId class below.

public class SortBasedOnMessageId implements Comparator<JSONObject> {
    /*
    * (non-Javadoc)
    * 
    * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
    * lhs- 1st message in the form of json object. rhs- 2nd message in the form
    * of json object.
    */
    @Override
    public int compare(JSONObject lhs, JSONObject rhs) {
        try {
            return lhs.getInt("messageId") > rhs.getInt("messageId") ? 1 : (lhs
                .getInt("messageId") < rhs.getInt("messageId") ? -1 : 0);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return 0;

    }
}

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