JsonString value to extract specific key

Question

Spec : JARS used Jackson for Json parsing /extraction in Java (JDK-15)

Statement : String val1 = "[ {"UnitId":"106","CategoryId":"403","ProductId":"103 ","ProductName":"California Apples","ProductWeight":"250"} ]";

Question : I need to extract values of "ProductName" from the Json Verified String.

Problem : I need to use Jakson jar libraries Only to parse & extract. I have tried sample code using jackson libraries on stackoverflow...did not work.

If some body has sample code to try, please share.

with regard Karthik

Answer 1

As an option, if you don't want create object for that. You can do like this:

    private static JsonMapper JSON_MAPPER = new JsonMapper();

    public static String parseProductId(String rawJson) {
    try {
        JsonNode root = JSON_MAPPER.readTree(rawJson);
        return root.get(0).get("ProductId").asText();
    } catch (JsonProcessingException e) {
        throw new IllegalArgumentException("Some information");
    }
}

In my opinion, this method gives flexibility if we need 1-2 fields.