在Java中将JSON从一种格式转换为另一种JSON格式

Question

I have to covert a specific JSON response and covert to some other format

For Eg My input JSON is like

JSON1

[
    {
        "propertyId":10081,
        "roomId":0,
        "startDate":"2018-01-29T00:00:00",
        "endDate":"2018-01-30T00:00:00",
        "priority":1,
        "message":"Test it",
        "id":158,
        "dateModifiedUtc":null
    },
    {
        "propertyId":10081,
        "roomId":10021855,
        "startDate":"2018-01-29T00:00:00",
        "endDate":"2018-01-30T00:00:00",
        "priority":2,
        "message":"Check how it works",
        "id":159,
        "dateModifiedUtc":null
    },
    {
        "propertyId":10081,
        "roomId":10021855,
        "startDate":"2018-01-29T00:00:00",
        "endDate":"2018-01-30T00:00:00",
        "priority":2,
        "message":"Check how it works",
        "id":160,
        "dateModifiedUtc":null
    }
]

I need to replace some values for roomId and then convert json to below format and send it to some other endpoint

JSON2

{
    "sitenotification":[
        {
            "roomid":"10601",
            "priority":1,
            "startdate":"2017-08-10T15:50:52+03:00",
            "enddate":"2017-08-15T15:50:52+03:00",
            "sitemessage":"test"
        },
        {
            "roomid":"10601",
            "priority":1,
            "startdate":"2017-08-10T15:50:52+03:00",
            "enddate":"2017-08-15T15:50:52+03:00",
            "customermessage":"test 2"
        }
    ]
}

I tried doing this in couple of ways like Deserialization using jackson and mapping it to specific class like below

@JsonIgnoreProperties(ignoreUnknown = true)
public class FatNotificationsAttributesDataModel {

    @JsonProperty("propertyId")
    public int propertyId;
    @JsonProperty("roomId")
    public int roomId;
    @JsonProperty("startDate")
    public String startDate;
    @JsonProperty("endDate")
    public String endDate;
    @JsonProperty("priority")
    public int priority;
    @JsonProperty("message")
    public String message;
    @JsonProperty("id")
    public int id;
    @JsonProperty("dateModifiedUtc")
    public String dateModifiedUtc;

}

and then again serialising it using a different class

@JsonSerialize(using = CustomSerializer.class)
public class FinalDataModel {

    public int roomId;

    public String startDate;

    public String endDate;

    public int priority;

    public String message;

}

But somehow the conversion is not working. Do we have any better way to achieve this?

Answer 1

You can achieve that by using JSONObject and JSONArray

//Create a JSON array with your json string
JSONArray array = new JSONArray(jsonString);
JSONArray newArray = new JSONArray();
//loop on your JSONArray elements
for (i=0, i<array.size(),i++) {
    //Get each separate object into a JSONObject
    JSONObject obj = array.getJSONObject(i);
    //let say you want to modify id for example
    obj.put("id", 12345);
    //push the modifyed object into your new array
    newArray.put(obj);
}
//transform the array into a string
String json = newArray.toString();

Answer 2

Use Jolt Convertor. Simplest, and esiest way to convert any JSON to any other JSON format.

https://jolt-demo.appspot.com/#inception