[英]Jackson - Deserializing JSON to class
I am calling an endpoint which returns JSON that that looks something like this (in Postman): 我正在调用一个端点,该端点返回看起来像这样的JSON(在Postman中):
{
"Result": {
"attribute1": { ... },
"attribute2": { ... }
}
}
The Content-Type header returned by this request is text/x-json
(as opposed to the usual application/json
). 此请求返回的Content-Type标头是
text/x-json
(与通常的application/json
相反)。 I think this is causing some problems when trying to deserialize this through Jackson. 我认为这在尝试通过Jackson进行反序列化时会引起一些问题。 The POJO for this JSON looks something like this:
这个JSON的POJO看起来像这样:
@Getter
@Setter
public class Response {
@JsonProperty("Result")
private Result result;
}
The Result
class is from an external library (the same guys who wrote this endpoint). Result
类来自外部库(编写此终结点的人相同)。 Either ways, when I try to call this endpoint through RestTemplate.exchange()
, Jackson is unable to deserialize this JSON into a valid Result
class. 无论哪种方式,当我尝试通过
RestTemplate.exchange()
调用此终结RestTemplate.exchange()
,Jackson都无法将此JSON反序列化为有效的Result
类。 I am doing this: 我正在这样做:
ResponseEntity<Response> response = restTemplate.exchange(url, HttpMethod.GET, null, Response.class);
Doing response.getBody()
gives a Response
object which contains a null Result
object. 进行
response.getBody()
会给出一个Response
对象,其中包含一个空Result
对象。 Apparently, Jackson is not deserializing the JSON properly. 显然,Jackson没有正确反序列化JSON。 I suspect this is because of the unusual
text/x-json
Content-Type returned by the API. 我怀疑这是由于API返回的异常
text/x-json
Content-Type。
I also have my MappingJackson2HttpMessageConverter
object configured to be able to parse text/x-json
Content-type, but no luck: 我也将我的
MappingJackson2HttpMessageConverter
对象配置为能够解析text/x-json
Content-type,但是没有运气:
MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
jsonConverter.setSupportedMediaTypes(ImmutableList.of(new MediaType("text", "x-json")));
restTemplate.getMessageConverters().add(jsonConverter);
Any pointers? 有指针吗?
Update: I don't know why this didn't work, but I figured out an alternative way - fetching the JSON as Map
instead of a domain object, which is good enough for my purposes. 更新:我不知道为什么这不起作用,但是我想出了另一种方法-将JSON作为
Map
而不是域对象来获取,这足以满足我的目的。
By default MappingJackson2HttpMessageConverter
is bind to: 默认情况下,
MappingJackson2HttpMessageConverter
绑定到:
We need to add text/x-json
. 我们需要添加
text/x-json
。
MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
List<MediaType> jsonTypes = new ArrayList<>(jsonConverter.getSupportedMediaTypes());
jsonTypes.add(new MediaType("text", "x-json"));
jsonConverter.setSupportedMediaTypes(jsonTypes);
Now, we should use it in RestTemplate
: 现在,我们应该在
RestTemplate
使用它:
restTemplate.setMessageConverters(Collections.singletonList(jsonConverter));
ResponseEntity<RequestPayload> response = restTemplate.exchange(url, HttpMethod.GET, null, RequestPayload.class);
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