Spring Boot：请求和响应的不同ObjectMapper实例 [英] Spring Boot : Different ObjectMapper instances for Request and Response

问题描述

我的春季启动应用程序中有以下控制器：

I have following controller in my spring boot application:

@RequestMapping(method = RequestMethod.POST)
public ResponseEntity<ResponseDto<MyClass> process(@RequestBody RequestDto<MyClass> request){
    return null;
}

MyClass 有一个字段，让我们说'myField'，我想要不同的 NamingStrategy 配置这个字段的请求和响应（这是因为我不想只为一个创建一个新类领域）。我已经配置了 ObjectMapper 实例，如下所示：

MyClass has a field, let's say 'myField' and I want different NamingStrategyconfiguration for request and response for this field (this is because I don't want to create a new class just for one field). I have configured ObjectMapper instance as below:

@Bean
public ObjectMapper objectMapper(){
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setPropertyNamingStrategy(namingStrategy);
    return objectMapper;
}

这将用于请求和响应（即反序列化和序列化），在spring boot中有什么方法可以指示控制器使用不同的 ObjectMapper 实例？

This will be used both for Request and Response (i.e. deserialization and serialization), is there any way in spring boot by which I can instruct the controller to use different ObjectMapper instances?

推荐答案

您可以使用 内容协商解决此问题。首先，定义您的自定义 HttpMessageConverter 。在下面的示例中，我定义了一个自定义转换器，当请求 Content-Type 标头设置为 application / test + json ：

You can solve it with content negotiation. Firstly, define your custom HttpMessageConverter. In following example I have defined a custom converter that is applied when the request Content-Type header is set to application/test+json:

@Bean
public HttpMessageConverters customConverters() {
    final AbstractJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter(new ObjectMapper());
    converter.setSupportedMediaTypes(Collections.singletonList(MediaType.valueOf("application/test+json")));

    return new HttpMessageConverters(true, Collections.singletonList(converter));
}

为了简化这个例子，我使用了新创建的 ObjectMapper - 在你的情况下，你必须在这里传递先前配置的对象。

For simplicity of this example I've used newly created ObjectMapper - in your case you will have to pass here previously configured object.

接下来就是告诉你的行动只接受 appliction / test + json 请求（请记住，从现在起它需要 Content-Type：application / test + json 在此端点的每个请求中显示的标头）：

Next thing is to tell your action to accept only appliction/test+json requests (keep in mind, that from now on it requires to Content-Type:application/test+json header to present in every request to this endpoint):

@RequestMapping(method = RequestMethod.POST, consumes = "application/test+json")
public ResponseEntity<ResponseDto<MyClass> process(@RequestBody RequestDto<MyClass> request){
    return null;
}

最后一件事是确保在调用此端点时 Content-Type：application / test + json 标头已设置。当然，您可以使用任何其他名称来获得所需的内容类型，显示的名称只是一个示例。

Last thing is to make sure that when you call this endpoint, Content-Type:application/test+json header is set. Of course you can use any other name for desired content type, presented name is just an example.

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