这个应该能用

public JsonNode test() throws JsonProcessingException {
        String jsonArray = "[\n" +
                " {\n" +
                "  \"id\": \"1\",\n" +
                "  \"name\": \"abc\",\n" +
                "  \"gender\": \"F\"\n" +
                " },\n" +
                "{\n" +
                "  \"id\": \"2\",\n" +
                "  \"name\": \"dgc\",\n" +
                "  \"address\": \"MDU\"\n" +
                " },\n" +
                " {\n" +
                "  \"id\": \"3\",\n" +
                "  \"name\": \"ghf\",\n" +
                "  \"gender\": \"M\"\n" +
                " }\n" +
                "]";

        // Parse the JSON array
        ObjectMapper objectMapper = new ObjectMapper();
        JsonNode jsonNode = objectMapper.readTree(jsonArray);

        // Create a map to hold the combined values
        Map<String, String> combinedValues = new HashMap<>();

        // Iterate over the JSON array and combine values
        Iterator<JsonNode> iterator = jsonNode.iterator();
        while (iterator.hasNext()) {
            JsonNode item = iterator.next();
            item.fields().forEachRemaining(entry -> {
                String key = entry.getKey();
                String value = entry.getValue().asText();
                combinedValues.merge(key, value, (v1, v2) -> v1 + "," + v2);
            });
        }

        // Create the resulting JSON object
        return objectMapper.valueToTree(combinedValues);

    }

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