CODEWITHSUNDEEP
javajsontype-conversion
Cemre Suler
Cemre Suler

Reputation: 3

I want to combine multiple JSON objects into a single array

I'm trying to combine multiple JSON objects into one JSON array and maybe filter on the name of the data (temperature, pressure, altitude).

I tried to use JSON-Simple and Java but I can't get it to work.

Here are the pieces of JSON:

The input I want to convert:

{"temperature" : -12, "sendtimes" : 10000}
{"pressure" : 1000, "sendtimes" : 10001}
{"altitude" : 100.7, "sendtimes" : 10002}`

How I want it after conversion:

{
  "temperaturData": [
      {"temperature": -12, "sendtimes": 10000},
      {"pressure" : 1000, "sendtimes" : 10001},
      {"altitude" : 100.7, "sendtimes" : 10002},
  ]
}

I have no clue on how to do this, thanks to everyone who can help me!

Upvotes: 0

Views: 4712

Answers (3)

Michael Gantman
Michael Gantman

Reputation: 7808

JSON Library mentioned by Jatin Asija is a very cool and simple JSON library that you efinitely can use to get what you want. However the de-facto standard for working with JSON in java is Jackson JSON library also known as "FasterXML/jackson". All you will have to do is to use ObjectMapperclass and its methods readValue() and writeValueAsString(Object value) to do whatever you want. Here is cool tutorial for ObjectMapper and Here are the Maven dependencies you might need to use it:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
</dependency>

Here is javadoc for ObjectMapper

Upvotes: 0

Jatin Asija
Jatin Asija

Reputation: 128

Using JSON Library

JSONArray arr = new JSONArray();
JSONObject obj = new JSONObject();
obj.put("temperature", "-12");
obj.put("sendtimes", "1000");

arr.put(obj);
obj = new JSONObject();
obj.put("pressure", "1000");
obj.put("sendtimes", "1001");

arr.put(obj);

JSONObject finalObj = new JSONObject();
finalObj.put("temperaturData", arr);
System.out.println(finalObj);

Though what I suggest is that, you should better assign keys to the given inner arrays too, which will make accessing it easy and bug free.

Upvotes: 1

Cognoscis
Cognoscis

Reputation: 342

It is quite simple what you want to achieve. I am using JavaScript, same can be achieved with any other language using similar data structure. What you want to do is create an array and append the values to that array.

var tempData = {"temperaturData" : []}
tempData["temperaturData"].push({"temperature": -12, "sendtimes": 10000})
tempData["temperaturData"].push({"pressure" : 1000, "sendtimes" : 10001})
tempData["temperaturData"].push({"altitude" : 100.7, "sendtimes" : 10002})
JSON.stringify(tempData)

Upvotes: 0

Related Questions