How to iterate over a JsonArray in Java (not java 8)

Question

I would like to iterate over an array in this Json object:

{
  "id": "2234",
  "Messages": [
    {
      "MessageId": 321231239,
      "Text_message": "my text message",
      "date": 1444666348
    },
    {
      "MessageId": 3217437239,
      "Text_message": "my text message 2",
      "date": 1444666348
    }
  ]
}

in my code I have:

JsonArray messagesJson = jsonObject.getJsonArray("Messages");

my imports related to this are:

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonObject;
import javax.json.JsonReader;

Now I want to iterate over this array and extract fields for my bean. But I don't want to use the for loop with index. I want to use a foreach type of loop. I am working with Java 7. What I want is something that is more like the Scala way of doing it:

messagesJson.map { json => 
    MyBean(
        (json \ "MessageId").getOrElse(""),
        (json \ "text_message").getOrElse(""),
        (json \ "date").getOrElse("")
    )
}

use Gson o jackson, they simplify the iteration and are developed to make easier the life — ΦXocę 웃 Пepeúpa ツ
– ΦXocę 웃 Пepeúpa ツ, Commented Feb 2, 2016 at 18:37
What's wrong with for ( JsonValue val : messageJson ) ...? — RealSkeptic
– RealSkeptic, Commented Feb 2, 2016 at 18:37

FMiscia · Accepted Answer · 2016-02-02 18:42:23Z

2

As the documentation says, JsonArray extends List<JsonValue> so you can simply iterate over JsonValue.

for(JsonValue value : yourJsonArray){
....
}

answered Feb 2, 2016 at 18:42

FMiscia

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2 Comments

Dannyvas Over a year ago

How would you turn value into JsonObject?

FMiscia Over a year ago

you can use getValueType() and check if the result is equal to one of the values of JsonType.ValueType enum. Take a look here: docs.oracle.com/javaee/7/api/javax/json/…

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