Jersey Jackson JSON响应实体反序列化结果显示在空白字段中

Question

我遇到了一个问题。Jersey客户端通过调用反序列化我的POJO时

jersey.api.ClientResponse#getEntity(OrderCostSummary.class)

响应json中的所有字段，即小计、发货成本、税和总计都为空。

我最初认为这与Money类有关，即ObjectMapper不知道如何反序列化这个类，但我有其他api调用，这些调用返回带有Money字段的响应实体，这些字段反序列化没有任何问题。

这是从服务器返回的JSON：

{ "orderCostSummary":{
  "subTotal":{
     "amount":"9.99",
     "currency":"GBP"
  },
  "shippingCost":{
   "money": {
     "amount":2.95,
     "currency":"GBP"
     }
  },
  "tax":{
     "amount":0,
     "currency":"GBP"
  },
  "total":{
     "amount":12.94,
     "currency":"GBP"
  }}}

波乔

public class OrderCostSummary {
private Money subTotal;
private Money shippingCost;
private Money tax;
private Money total;

/**
 * Instantiates a new Order cost summary.
 */
public OrderCostSummary() {
}

public Money getSubTotal() {
    return subTotal;
}

public void setSubTotal(Money subTotal) {
    this.subTotal = subTotal;
}

public Money getShippingCost() {
    return shippingCost;
}

public void setShippingCost(Money shippingCost) {
    this.shippingCost = shippingCost;
}

public Money getTax() {
    return tax;
}

public void setTax(Money tax) {
    this.tax = tax;
}

public Money getTotal() {
    return total;
}

public void setTotal(Money total) {
    this.total = total;
}

public class Money {
private BigDecimal amount;
private Currency currency;

我的钱POJO

public Money() { }

public Money(BigDecimal amount, Currency currency) {
    this.amount = amount;
    this.currency = currency;
}

public BigDecimal getAmount() {
    return amount;
}

public void setAmount(BigDecimal amount) {
    this.amount = amount;
}

public Currency getCurrency() {
    return currency;
}

public void setCurrency(Currency currency) {
    this.currency = currency;
}

Answer 1

答案是以下json应该与调用一起反序列化

jersey.api.ClientResponse#getEntity(ClassThatHoldsOrderCostSummary.class)

一旦对象被反序列化，我就可以调用

classThatHoldsOrderCostSummary.getOrderCostSummary()

Answer 2

看来你的结构并不总是一样的：

此结构：

{
   "orderCostSummary":{
      "subTotal":{
         "amount":"9.99",
         "currency":"GBP"
      },
      "shippingCost":{
         "amount":2.95,
         "currency":"GBP"
      },
      "tax":{
         "amount":0,
         "currency":"GBP"
      },
      "total":{
         "amount":12.94,
         "currency":"GBP"
      }
   }
}

与此结构不同：

{
   "orderCostSummary":{
      "subTotal":{
         "money":{
            "amount":"9.99",
            "currency":"GBP"
         }
      },
      "shippingCost":{
         "money":{
            "amount":2.95,
            "currency":"GBP"
         }
      },
      "tax":{
         "money":{
            "amount":0,
            "currency":"GBP"
         }
      },
      "total":{
         "money":{
            "amount":12.94,
            "currency":"GBP"
         }
      }
   }
}

Answer 3

如果您尝试以下方法：

public class OrderCostSummary implements Serializable {
    @JsonDeserialize(as=Money.class)
    private Money subTotal;
    //And do the same with other fields.
    ...
}

注意，我添加了“implements Serializable”，这对于序列化/反序列化的POJO更好