將 object 放入 Jackson 的 ObjectNode

Question

我正在嘗試在Object的ObjectNode中設置 Object 並且我能夠做到這一點，但是在將其設置到 object 節點時遇到了問題。 null屬性也即將到來，我嘗試使用 GSON 但隨后請求中出現了" \" 。

public class Testing4 {
        public static void main(String[] args) throws JsonProcessingException {
        
            ObjectNode request = null;
            ObjectMapper mapper = new ObjectMapper();
            request = mapper.createObjectNode();
            
                    
            RequestParam requestParam  = new RequestParam();
            requestParam.setCustomerName("sachin");
            requestParam.setCustomerOrderNumber("12344556");
            
            request.set("request",mapper.convertValue(requestParam, JsonNode.class));
            request.put("FatherName","jithin");
            
            String req = mapper.createObjectNode().set("request", request).toString();
            System.out.println(req);
            
            
            
        }

        private static Comparator<? super String> kFirst() {
          return (s1, s2) -> "k".equals(s1) ? -1 : "k".equals(s2) ? 1 : 0;
        
}
}

DTO class

public class RequestParam implements Serializable {
    

        /**
     * 
     */
    private static final long serialVersionUID = 1L;
        private String orderDueDate;
        private String originatingSystemOrderId;
        private String objectId;
        private String taskTypeId;
        private String customerId;
        private String customerName;
        private String customerOrderNumber;
        private Dataset dataset;


}

在這里我可以得到 o/p 但 o/p 包括null分配以及我將如何刪除null分配我現在得到的 o/p

{
  "request": {
    "request": {
      "orderDueDate": null,
      "originatingSystemOrderId": null,
      "objectId": null,
      "taskTypeId": null,
      "customerId": null,
      "customerName": "sachin",
      "customerOrderNumber": "12344556",
      "dataset": null
    },
    "FatherName": "jithin"
  }
}

我想要的 o/p

{
  "request": {
    "request": {
      "customerName": "sachin",
      "customerOrderNumber": "12344556"
    },
    "FatherName": "jithin"
  }
}

請幫忙，謝謝

Answer 1

如果@JsonInclude(Include.NON_NULL)有效，則使用

 @JsonInclude(JsonInclude.Include.NON_NULL)

(@JsonSerialize(include = Inclusion.NON_NULL)不要使用它已棄用）@JsonInclude(JsonInclude.Include.NON_NULL) public class RequestParam 實現可序列化 {

    private static final long serialVersionUID = 1L;
        private String orderDueDate;
        private String originatingSystemOrderId;
        private String objectId;
        private String taskTypeId;
        private String customerId;
        private String customerName;
        private String customerOrderNumber;
        private Dataset dataset;


}

Answer 2

@JsonInclude(Include.NON_NULL)
public class RequestParam implements Serializable {
    
    private static final long serialVersionUID = 1L;
        private String orderDueDate;
        private String originatingSystemOrderId;
        private String objectId;
        private String taskTypeId;
        private String customerId;
        private String customerName;
        private String customerOrderNumber;
        private Dataset dataset;


}

需要添加import語句import com.fasterxml.jackson.annotation.JsonInclude;

在 DTO class 定義之前添加@JsonInclude(Include.NON_NULL)