What is Content Negotiation in Spring MVC?
What is Content Negotiation in Spring MVC?
Spring soon introduced the Content Negotiation strategy, where we can use the traditional RESTful @ResponseBody approach and HTTP message converters, to return desired outputs in JSON or XML, along with some flexibility and dynamicity it provides with the configuration.
What is Content Negotiation strategy?
Working out which data format to return is called Content Negotiation. There are three situations where we need to know what type of data-format to send in the HTTP response: Request Mappings: Map an incoming HTTP request to different methods that return different formats. View Resolution: Pick the right view to use.
What is Content Negotiation in spring boot?
Content Negotiation helps the Consumer and Provider interact about the data exchange format. In this article, we will expose both XML and JSON representations.
What is the main difference between @controller and @RestController?
The @Controller annotation indicates that the class is a “Controller” e.g. a web controller while the @RestController annotation indicates that the class is a controller where @RequestMapping methods assume @ResponseBody semantics by default i.e. servicing REST API.
What is the use of WebMvcConfigurer?
Interface WebMvcConfigurer. Defines callback methods to customize the Java-based configuration for Spring MVC enabled via @EnableWebMvc . @EnableWebMvc -annotated configuration classes may implement this interface to be called back and given a chance to customize the default configuration.
What is spring boot Mediatype?
In Spring REST APIs, Spring uses ‘application/json’ as a default media type. That is why, a REST controller can consume or produce JSON format payloads without having to specify the media types explicitly. Thus, in order to consume or produce data in a different form, the controller needs to specify that explicitly.
What is view resolver in Spring MVC?
Spring provides view resolvers, which enable you to render models in a browser without tying you to a specific view technology. The two interfaces which are important to the way Spring handles views are ViewResolver and View . The ViewResolver provides a mapping between view names and actual views.
What is Content-Type API?
The Content-Type header describes the format the body of your request is being sent as. For example, the body of your requests can be sent as JSON or XML, but you need to declare in the Content-Type header which one is being used. This header is required in all requests. To send JSON in a request, use application/json.
How do I configure content negotiation in spring?
You can configure a content negotiation strategy centrally once and it will apply wherever different formats (media types) need to be determined. Spring supports a couple of conventions for selecting the format required: URL suffixes and/or a URL parameter. These work alongside the use of Accept headers.
Can content-negotiation be used with views?
My previous post discussed content-negotiation in general and showed examples of RESTful controllers using HTTP Message Converters. But content-negotiation can also be used with Views as well. For example, suppose I wish to display account information not just as a web-page, but also make it available as a spreadsheet too.
How to customize the content negotiation manager in webmvc?
Simply customize the predefined content negotiation manager via its configurer. Note the MediaType helper class has predefined constants for most well-known media-types. @Configuration @EnableWebMvc public class WebConfig extends WebMvcConfigurerAdapter { /** * Setup a simple strategy: use all the defaults and return XML by default when not sure.
What is contentnegotiationmanager in Java?
The ContentNegotiationManager created by either setup is an implementation of ContentNegotationStrategy that implements the PPA Strategy (path extension, then parameter, then Accept header) described above. In Java configuration, the strategy can be fully customized using methods on the configurer:
