在没有序列化的 Jackson JsonNode 中查找值

Question

I have multiple complex (Jackson) JsonNode structures which I need to find a value in. The problem is very similar to: how to parse json array value using json node and Jackson JsonNode Serialization .

So I would like to find a value inside a JsonNode with the following limitation: The context is provided by (Cucumber) tests. eg 'Inside "title/configurations/relation" I see the value "a" ' see example below.

The code I've tried to use:

public JsonNode findNodeInPath (String path, JsonNode parent) {
        int firstSlash = path.indexOf("/");
        if (parent == null) {
            return null;
        }
        else {
            String nextNodeName = firstSlash == -1 ? path : path.substring(0, firstSlash);
            if (parent.isObject()) {
                return findNodeInPath(firstSlash == -1 ? path : path.substring(firstSlash + 1), parent.findValue(nextNodeName));
            }
            else { // parent is array
                if (parent.has(path)) {
                    return parent;
                }
                for (JsonNode node : parent) {
                    JsonNode nextNode = node.findValue(nextNodeName);
                    if (nextNode != null) {
                        return findNodeInPath(firstSlash == -1 ? path : path.substring(firstSlash + 1), nextNode);
                    }
                }
            }

            return null; // not found
        }
}

But that doesn't work because when I get to a JsonArray with strings only (like "relation" below) Jackson doesn't let me access the text inside it.

I don't want to create a POJO for each JsonNode because:

1. The variance between nodes is very big. I can't see any object that will fit even most of the configurations I have.

2. This is used for testing only. The structures as they are, just sit on the database. I wouldn't like to create objects solely for testing purposes.

An example of a JsonNode I have:

{
  "title": [
    {
      "configuration": [
        {
          "product1": {
            "id": "id1",
            "name": [
              {
                "locale": "en_US",
                "value": "value1"
              }
            ]
          },
          "configured": true,
          "relation": ["a","b","c"],
          "relation2": []
        }
      ]
    }
  ]
}

I apologize for the long question, any help (from any direction) would be greatly appreciated.

Answer 1

Extract Array node:

JsonNode node = jsonNode.findPath("relation");

Convert the array node to List of strings:

List<String> relationList = new ObjectMapper().readValue(node.toString(), new TypeReference<List<String>>() {});