JSON parsing with Eclipse

Question

I'm new in java and i have this maybe simple faculty project. I must to parse json with eclipse, so i started but without any success. I don't know how to start when i have a multiple object in json.

I started like this:

public static void main(String[] args) {

         FileReader reader = new FileReader(filePath);


            JSONParser jsonParser = new JSONParser();
            JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
            JSONArray objectArray = jsonObject.getJSONArray("product");


            //JSONObject site= jsonSites.getJSONObject(1);

            long elementaryProductId =  (long) jsonObject[0].get("elementaryProductId");
            System.out.println("The id is: " + elementaryProductId);'

And thi is my json file:

[{  
    "elementaryProductId":1,
    "bonusMalus":30,
    "deductible":500,
    "comprehensive":1,
    "partial":0,
    "legacyPremium":130,
    "product":{  
        "productId":2,
        "garage":"true",
        "constructionYear":1990,
        "region":"East",
        "dateOfBirthYoungest":"1983-06-22",
        "objectValue":25000,
        "type":"Car",
        "insuredObject":{  
            "name":"Car",
            "ownersName":"Jovana",
            "mileage":300000,
            "engineCapacity":120
        },
        "salesProduct":{  
            "salesProductId":3,
            "currency":"EUR",
            "contractStart":"2011-01-01",
            "contractEnd":"2012-01-01"
        },
        "productType":"Car"
    }
},
{  
    "elementaryProductId":1,
    "bonusMalus":5,
    "deductible":100,
    "comprehensive":1,
    "partial":0,
    "legacyPremium":75.38,
    "product":{  
        "productId":2,
        "garage":"true",
        "constructionYear":2005,
        "region":"East",
        "dateOfBirthYoungest":"1999-06-22",
        "objectValue":30000,
        "type":"Car",
        "insuredObject":{  
            "name":"Car",
            "ownersName":"Jelena",
            "mileage":300000,
            "engineCapacity":210
        },
        "salesProduct":{  
            "salesProductId":3,
            "currency":"EUR",
            "contractStart":"2013-01-01",
            "contractEnd":"2014-01-01"
        },
        "productType":"Car"
    }
}]

Welcome to Stackoverflow, Pepinho. Do you get any error? What are your results compared to your expectations? Please add this to your question by editing. — try-catch-finally
– try-catch-finally, Commented Dec 25, 2014 at 13:19
Be sure to add the complete code, the full JSON input and the stacktrace of any exception you may have encountered (or the incorrect results vs. the expected ones). — linusv
– linusv, Commented Dec 25, 2014 at 13:20
Before that i have errors :JSONArray objectArray = jsonObject.getJSONArray(""); — Pepinho
– Pepinho, Commented Dec 25, 2014 at 13:25

Eduardo · Accepted Answer · 2014-12-25 13:33:08Z

2

I got it to work with the following:

public static void main(String[] args) throws IOException, ParseException{
    FileReader reader = new FileReader(new File("filename.json"));


    JSONParser jsonParser = new JSONParser();
    JSONArray jsonArray = (JSONArray) jsonParser.parse(reader);
    JSONObject object = (JSONObject) jsonArray.get(0);
    long elementaryProductId = (Long) object.get("elementaryProductId");



    System.out.println("The id is: " + elementaryProductId);
}

Explanation of the above:

You know the outermost element is an array so parse straight into a JSONArray. Next you want to pull out the first element of that array which is a JSONObject (its in braces). After that the code should be fairly self explanatory :)

answered Dec 25, 2014 at 13:33

Eduardo

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1 Comment

Eduardo Over a year ago

Have you imported java.io.File;? On that class in eclipse just press ctrl+shift+o (organize imports) and it should sort that out

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