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[[mvc-view-jackson]]
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= Jackson
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[.small]#xref:web/webflux-view.adoc#webflux-view-httpmessagewriter[See equivalent in the Reactive stack]#
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Spring offers support for the Jackson JSON library.
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[[mvc-view-json-mapping]]
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== Jackson-based JSON MVC Views
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[.small]#xref:web/webflux-view.adoc#webflux-view-httpmessagewriter[See equivalent in the Reactive stack]#
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The `MappingJackson2JsonView` uses the Jackson library's `ObjectMapper` to render the response
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content as JSON. By default, the entire contents of the model map (with the exception of
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framework-specific classes) are encoded as JSON. For cases where the contents of the
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map need to be filtered, you can specify a specific set of model attributes to encode
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by using the `modelKeys` property. You can also use the `extractValueFromSingleKeyModel`
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property to have the value in single-key models extracted and serialized directly rather
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than as a map of model attributes.
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You can customize JSON mapping as needed by using Jackson's provided
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annotations. When you need further control, you can inject a custom `ObjectMapper`
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through the `ObjectMapper` property, for cases where you need to provide custom JSON
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serializers and deserializers for specific types.
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[[mvc-view-xml-mapping]]
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== Jackson-based XML Views
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[.small]#xref:web/webflux-view.adoc#webflux-view-httpmessagewriter[See equivalent in the Reactive stack]#
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`MappingJackson2XmlView` uses the
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https://github.com/FasterXML/jackson-dataformat-xml[Jackson XML extension's] `XmlMapper`
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to render the response content as XML. If the model contains multiple entries, you should
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explicitly set the object to be serialized by using the `modelKey` bean property. If the
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model contains a single entry, it is serialized automatically.
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You can customized XML mapping as needed by using JAXB or Jackson's provided
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annotations. When you need further control, you can inject a custom `XmlMapper`
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through the `ObjectMapper` property, for cases where custom XML
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you need to provide serializers and deserializers for specific types.
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