序列化 Map<String, Map<String, String>>

Question

所以我有一个使用 webflux 的 GET 请求，如下所示：

suspend fun getProperties(): Map<String, Map<String, String>> {
        return webClient
            .get()
            .uri("/property/all")
            .retrieve()
            .bodyToMono(object : ParameterizedTypeReference<Map<String, Map<String, String>>>() {})
            .awaitSingle()
    }

要接收的架构如下所示：

{
  "additionalProp1": {
    "additionalProp1": "string",
    "additionalProp2": "string",
    "additionalProp3": "string"
  },
  "additionalProp2": {
    "additionalProp1": "string",
    "additionalProp2": "string",
    "additionalProp3": "string"
  },
  "additionalProp3": {
    "additionalProp1": "string",
    "additionalProp2": "string",
    "additionalProp3": "string"
  }
}

当调用被触发时，我收到一个错误：

"JSON encoding error: class java.util.LinkedHashMap cannot be cast to class java.lang.String (java.util.LinkedHashMap and java.lang.String are in module java.base of loader 'bootstrap'); nested exception is com.fasterxml.jackson.databind.JsonMappingException: class java.util.LinkedHashMap cannot be cast to class java.lang.String (java.util.LinkedHashMap and java.lang.String are in module java.base of loader 'bootstrap')"

如何正确编写嵌套地图的自定义序列化？

Answer 1

您的回复看起来不像 Map<String, Map<String, String>> ，而是看起来像 List<Map<String , String>> ，您可以将代码更新为

suspend fun getProperties(): Map<String, Map<String, String>> {
        return webClient
            .get()
            .uri("/property/all")
            .retrieve()
            .bodyToMono(object : ParameterizedTypeReference<List<Map<String , String>>>() {})
            .awaitSingle()
    }