使用Jackson读取空字符串值作为对象，并使用null属性
之类的值
我有一个API请求来处理有时用代码200返回的API请求，以及{“ key”：“ value”}
，但在某些情况下，API可能会使用代码204返回。处理此操作是其他故事一个空字符串，因此不会抛出NosuchelementException。
现在，我想以某种方式处理杰克逊的结果，在200个情况下，我会得到一个类似这样描述的类A的对象：
class A(@JsonProperty("key") val value: String?)
但是在204和空体反应的情况下，我想获得一个实例a带有value属性等于null。
我已经尝试添加一个自定义的Deserialiser，但是甚至在执行Deserialiser代码之前，我都会得到以下异常：
com.fasterxml.jackson.databind.exc.MismatchedInputException: No content to map due to end-of-input at [Source: (String)""; line: 1, column: 0]
这很明显，因为空字符串中没有顶级JSON对象。
有什么方法可以使用杰克逊实现所需的行为？
I have an API request to handle that sometimes returns with code 200 and a value of something like
{ "key" : "value" }
But in some cases, API might return with code 204. Handling this is a whole other story, but I end up with an interceptor that replaces a response body with an empty string, so it won't throw NoSuchElementException.
Now I want to handle the result with Jackson in a way, that in a case of 200 I would get an object of class A described like this:
class A(@JsonProperty("key") val value: String?)
But in the case of 204 and empty body response, I would like to get an instance of A with value property equals null.
I've tried adding a custom deserialiser, but I get the following exception even before my deserialiser code is executed:
com.fasterxml.jackson.databind.exc.MismatchedInputException: No content to map due to end-of-input at [Source: (String)""; line: 1, column: 0]
This is kind of obvious since there's no top-level JSON object in an empty string.
Is there a way I can achieve desired behaviour using Jackson?
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我不熟悉杰克逊，但我注意到你说
而不是空字符串返回
“ {\” key \ \“：null}”而不是吗？I'm not familiar with Jackson but I notice you said
Can't you just then instead of empty string return
"{ \"key\" : null }"instead?