java - 如何将两个相同的 json 属性名称分配给两个单独的字段

Question

我有以下 Java 类

我需要通过以下方式将其序列化为json:

如果列表(paymentTransactionReport 字段)不为空，则显示它的值 -

{ 
"paymentTransactionResponse" : [
    {},
    {}
  ]
}

如果列表为空，我需要在名称为“paymentTransactionResponse”的 json 字段中显示 paymentTransactionReportError，就像之前的情况一样。示例 -

{
"paymentTransactionResponse" : {
----
//fields from PaymentTransactionReportError class
----
  }
}

我该怎么做？最好不要自定义序列化器。如果像我一样只使用两个同名的注释@JsonProperty 和 JsonInclude.NON_NULL，我会遇到这个错误:No converter found for return value of type:... Seems to be that is a error happened during serialization because of fields with同名

Answer 1

实现此目的的一种方法是使用 @JsonAnyGetter , 试试这个

public class TestDTO {

@JsonIgnore
List<String> paymentTransactionResponse;

@JsonIgnore
String paymentTransactionResponseError;

public List<String> getPaymentTransactionResponse() {
    return paymentTransactionResponse;
}

public void setPaymentTransactionResponse(List<String> paymentTransactionResponse) {
    this.paymentTransactionResponse = paymentTransactionResponse;
}

public String getPaymentTransactionResponseError() {
    return paymentTransactionResponseError;
}

public void setPaymentTransactionResponseError(String paymentTransactionResponseError) {
    this.paymentTransactionResponseError = paymentTransactionResponseError;
}

@JsonAnyGetter
public Map<String, Object> getData(){
    Map<String, Object> map = new HashMap<String, Object>();
    if(paymentTransactionResponse != null) {
        map.put("paymentTransactionResponse", paymentTransactionResponse);
    }else {
        map.put("paymentTransactionResponse", paymentTransactionResponseError);
    }
    return map;
}}