Problems to continue to parse JSON to JAVA

Question

I am trying to parse a json string to java but have got stuck. My code looks like the below.

public static void main(String args[]) throws FileNotFoundException, IOException, ParseException {


    // parsing file "JSONExample.json" 
       Object obj = new JSONParser().parse(new FileReader("teams.json")); 

    // typecasting obj to JSONObject 
       JSONObject jo = (JSONObject) obj; 


    // getting address 
       Map teams = ((Map)jo.get("api")); 

       // iterating address Map 
       Iterator<Map.Entry> itr1 = teams.entrySet().iterator(); 
       while (itr1.hasNext()) { 
           Map.Entry pair = itr1.next(); 


           System.out.println(pair.getKey() + " : " + pair.getValue()); 
       }

And I get the following result.

    teams : [{"arena":"Old Trafford","name":"Manchester United","team_id":33,"city":"Manchester"}]
    results : 1

My teams.json looks like following

    {
        "api": {
            "results": 1,
            "teams": [
                {
                    "team_id": 33,
                    "name": "Manchester United",
                    "arena": "Old Trafford",
                    "city": "Manchester",
                }
            ]
        }
    }

How do I continue if I just want the keys and values in the teams-array into an arraylist in java for example.

Your code does not appear to match the output, suggesting that other code is producing the output, not what you are showing. Please create and post a valid [mre] with your question and show its output to avoid confusion. — Hovercraft Full Of Eels, Feb 29 '20 at 13:04
the question could do with tagging which of the many JSON parsers you are using. There's several candidates that use `JSONParser`. — Tom Hawtin - tackline, Feb 29 '20 at 13:06
check out https://www.baeldung.com/jackson-nested-values or http://tutorials.jenkov.com/java-json/jackson-jsonnode.html — hovanessyan, Feb 29 '20 at 13:06
@TomHawtin-tackline, true. There are a lot of different JSONParser. I used json-simple which I have read are not really updated for a while and I should perhaps use jackson instead but I solved it now. The problem I had were how to iterate over teams but found a solution. — JavaNisse, Feb 29 '20 at 14:01
@hovanessyan thank you for the pages. I got some ideas from them I suddenly found I similar example that helped me. — JavaNisse, Feb 29 '20 at 14:05
@HovercraftFullOfEels the code does match the output. I know since I got it to work. But I will have in mind for next time to post a valid minimal repoducible example. — JavaNisse, Feb 29 '20 at 14:05

Capriatto · Accepted Answer · 2020-02-29T14:33:24.643

0

you can use GSON library of google. Let's try this example.

First create your java Bean (FootballPlayer.java)

FootballPlayer.java
Then you can parse your JSON to Array:

ReadJson1.java

Credits to: Github@RicardoMoya

edited Feb 29 '20 at 14:33

answered Feb 29 '20 at 14:21

Capriatto

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Problems to continue to parse JSON to JAVA

1 Answers1