合并两个JsonNode

Question

我有两个JsonString，需要转换为JsonNode并加入这两个JsonNodes。如果两个jsonnode的键不同，则代码运行良好，但如果它们相同，则后者将覆盖。这是我的两个JsonNodes：

“{\”语音类型\：\“N95\”，\"cat\":\"WP\"}“ {“语音类型\”：\“n96\”，\“cat\”：\“Wy\”}。

我的代码生成的结果如下：{"phonetype":"N96","cat":"Wy"}

public class JsonJoining {

    public static void main(String[] args) throws JsonProcessingException, IOException {
        ObjectMapper mapper = new ObjectMapper();

        JsonNode mainNode=mapper.readTree("{\"phonetype\":\"N95\",\"cat\":\"WP\"}");

        JsonNode resuupdateNode=mapper.readTree("{\"phonetype\":\"N96\",\"cat\":\"Wy\"}");
        JsonNode result=merge(mainNode, resuupdateNode);
        System.out.println(result);
    }
    public static JsonNode merge(JsonNode mainNode, JsonNode updateNode) {

        Iterator<String> fieldNames = updateNode.fieldNames();
        while (fieldNames.hasNext()) {

            String fieldName = fieldNames.next();
            System.out.println(fieldName);
            JsonNode jsonNode = mainNode.get(fieldName);

            if (jsonNode != null && jsonNode.isObject()) {
                merge(jsonNode, updateNode.get(fieldName));
            }
            else {
                if (mainNode instanceof ObjectNode) {

                    JsonNode value = updateNode.get(fieldName);
                    ((ObjectNode) mainNode).put(fieldName, value);
                }
            }

        }

        return mainNode;
    }
}

是否有可能合并这两个Jsonnode并生成第三个jsonnode，其外观如下：

 {"firstjson":{"phonetype":"N95","cat":"WP"},
 "secondjson":{phonetype":"N96","cat":"Wy}}

Answer 1

尝试以下几个方面：

public static JsonNode mergeCollection(JsonNode value1,JsonNode value2){
        ObjectNode objectNode = mapper.createObjectNode();

             if(value1!=null) {
                 ObjectNode node1 = mapper.createObjectNode();

                 node1.set("value1",value1);
                 node1.fields().forEachRemaining(kv -> objectNode.set(kv.getKey(), kv.getValue()));
             }
             if(value2!=null) {
                 ObjectNode node2 = mapper.createObjectNode();
                 node2.set("value2",value2);
                 node2.fields().forEachRemaining(kv -> objectNode.set(kv.getKey(), kv.getValue()));
             }
        return objectNode;
}

Answer 2

ObjectMapper mapper = new ObjectMapper();
ArrayNode jsonArray = mapper.createArrayNode();

jsonArray.add(value1);
jsonArray.add(value2);

System.out.println(jsonArray);

Answer 3

相信我，下面的代码是合并两个或多个jsonnodes的最佳方法。

import com.fasterxml.jackson.databind.ObjectMapper;

import com.fasterxml.jackson.databind.JsonNode;

JsonNode js1,js2,js3;

String result=js1.toString()+js2.toString()+js3.toString();
result=result.replace("}{",",");
JsonNode j=new ObjectMapper().readTree(result); // remove the duplicate entry and convert string to json