Kotlin mapper.readValue 缺少字段

Question

在我的数据类中，我有

data class Example(
    val purchaseId: String,
    val customerId: String,
    val purchaseDate: Long
)

将有效负载映射到示例时，我有

val expectedValue = "{\"purchaseId\":\"5005d000023FqKXAA0\",\"customerId\":\"10065416831\",\"purchaseDate\":1687523394\"}"

val result = mapper.readValue(expectedValue, Example::class.java)

因此，当预期值具有所有属性时，预期值会毫无问题地映射到示例。

但是当预期值缺失时

purchaseId

或其他字段如

val expectedValue = "{\"customerId\":\"10065416831\",\"purchaseDate\":1687523394\"}"

我明白了

Instantiation of [simple type, class Example] value failed for JSON property purchaseId due to missing (therefore NULL) value for creator parameter caseId which is a non-nullable type

在不使示例字段可为空的情况下，有没有办法可以验证预期的有效负载是否具有我关心的属性？

Answer 1

您需要通过以下方式初始化您的ObjectMapper：

ObjectMapper mapper = new ObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

您正在寻找的是 FAIL_ON_UNKNOWN_PROPERTIES 配置属性。