Question 302567 in Json Question posted in
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trying to use a class to contain a JSON response

I’m trying to make a java class that will contain a response from a JSON that looks like this:

{
    "Global Quote": {
        "01. symbol": "IBM",
        "02. open": "160.0000",
        "03. high": "162.0400",
        "04. low": "160.0000",
        "05. price": "161.9600",
        "06. volume": "4561342",
        "07. latest trading day": "2023-12-08",
        "08. previous close": "160.2200",
        "09. change": "1.7400",
        "10. change percent": "1.0860%"
    }
}

So far i’ve tried using two seperate classes, one with a lot of String and double objects, and I landed on this most recently:

class VantageResponse { public Map<String, Object> globalQuote; }

I’ve been using google’s GSON.fromJson to parse the response into an object of class VantageResponse but it has always returned null. What am I doing wrong?

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2

Answers


  1. 0 
    protected convertToMap(JSONObject response){
  JSONObject contentsOfResponse = response.getJSONObject("Global Quote");
  // you will obtain the contents of the global quote
   Map<String,Object> globalQuote = new HashMap<>();
    Iterator<String> keys = contentsOfResponse.keys();
    while (keys.hasNext()) {
        String key = keys.next();
        Object value = contentsOfResponse.get(key);

        // Put the key-value pair into the HashMap
        globalQuote.put(key, value);
    }
  //you can also store this as a global variable using
  //this.globalQuote;  (in a class)
  return globalQuote;
  }

    Start writing a class that has a global variable of hashmap and then call this method to where you are containing the response. So far I have understood this should work. You can comment on this answer for other answer.

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  2. 0

    It looks like you are on the right track, but there might be an issue with the structure of your VantageResponse class. Here’s a modified version that should work:

    import com.google.gson.annotations.SerializedName;

import java.util.Map;

public class VantageResponse {
    @SerializedName("Global Quote")
    private GlobalQuote globalQuote;

    public GlobalQuote getGlobalQuote() {
        return globalQuote;
    }

    public void setGlobalQuote(GlobalQuote globalQuote) {
        this.globalQuote = globalQuote;
    }

    public static class GlobalQuote {

        @SerializedName("01. symbol")
        private String symbol;
        @SerializedName("02. open")
        private double open;
        @SerializedName("03. high")
        private double high;
        @SerializedName("04. low")
        private double low;
        @SerializedName("05. price")
        private double price;
        @SerializedName("06. volume")
        private long volume;
        @SerializedName("07. latest trading day")
        private String latestTradingDay;
        @SerializedName("08. previous close")
        private double previousClose;
        @SerializedName("09. change")
        private double change;
        @SerializedName("10. change percent")
        private String changePercent;

        // Getters and setters for all the fields

        // You can generate these using your IDE or write them manually
        // For simplicity, I'm showing just one getter here

        public String getSymbol() {
            return symbol;
        }

        public double getOpen() {
            return open;
        }

        public void setSymbol(String symbol) {
            this.symbol = symbol;
        }
    }
}

    With this structure, you can use Gson to deserialize the JSON response:

    import com.google.gson.Gson;

public class Main {
    public static void main(String[] args) {
        String jsonResponse = "{ "Global Quote": { "01. symbol": "IBM", "02. open": "160.0000", "03. high": "162.0400", "04. low": "160.0000", "05. price": "161.9600", "06. volume": "4561342", "07. latest trading day": "2023-12-08", "08. previous close": "160.2200", "09. change": "1.7400", "10. change percent": "1.0860%" } }";

        Gson gson = new Gson();
        VantageResponse vantageResponse = gson.fromJson(jsonResponse, VantageResponse.class);

        if (vantageResponse != null && vantageResponse.getGlobalQuote() != null) {
            System.out.println("Symbol: " + vantageResponse.getGlobalQuote().getSymbol());
            System.out.println("Open: " + vantageResponse.getGlobalQuote().getOpen());
            // Add more fields as needed
        } else {
            System.out.println("Failed to parse JSON response");
        }
    }
}
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