Get all key-value pair from nested JSON array-CodePudding

Hi I have a nested JSON which has JSON array also. i need all single key-value pairs. below is the nested JSON which has some JSON arrays.

{
  "relatedquoteresponse":{
    "responsepreamble":{
      "responseStatus":"Passed",
      "statusCode":"200"
    },
    "phone":null,
    "symbol":"$",
    "retrieverelatedquotes":[
      {
        "quoteId":23232
      },
      {
        "quoteName":"Netally-Service"
      }
    ],
    "CheckStatus":{
      "StatusCode":200,
      "responseMessage":"Found"
    }
  }
}

I need an output like this:

responseStatus : "Passed"
statusCode : "200"
Phone: null
symbol: "$"
quoteID: 23232
quoteName: "Netally-Service"

I tried below code, but getting this output.

ObjectMapper mapper = new ObjectMapper();
    JsonNode jsonNode = mapper.readTree(json);
    Iterator<String> iterator = jsonNode.fieldNames();
    while (iterator.hasNext()) {
        String key = iterator.next();
        printRec(jsonNode, key);
    }

public static void printRec(JsonNode jsonNode, String key) {
        JsonNode node = jsonNode.get(key);
        if (node.isObject()) {
            Iterator<Map.Entry<String, JsonNode>> fields = node.fields();
            fields.forEachRemaining(field -> {
                printRec(node, field.getKey());
                if (!field.getValue().isObject()) {
                    System.out.println(field.getKey()   " : "   field.getValue());
                }
            });
        }
    }

OutPut:

responseStatus : "Passed"
statusCode : "200"
Phone: null
symbol: "$"
retrieverelatedquotes : [{"quoteId":23232},{"quoteName":"Netally-Service"}]

Can anyone help me on this to get all key-value pairs not in array like above.

Thanks

CodePudding user response：

Question is not really clear. So if you get a real array how you plan to manage it? Anyway the simpliest way is to create POJO object for mapping and map JSON to this object.

CodePudding user response：

You can use Regex named groups feature to get all single keys and values

Pattern pattern = Pattern.compile("\"(. )\":(?![{\\[])(. )");
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
    System.out.println(matcher.group(1)   " : "   matcher.group(2));
}

Output will be:

responseStatus : "Passed",
statusCode : "200"
phone : null,
symbol : "$",
quoteId : 23232
quoteName : "Netally-Service"
StatusCode : 200,
responseMessage : "Found"

You can easily modify the pattern to get all single keys with int value for example or null value

Simple article about Regex Named groups and Backreferences