java.lang.Object
- org.springframework.web.accept.ContentNegotiationManager

All Implemented Interfaces:
ContentNegotiationStrategy, MediaTypeFileExtensionResolver
```
public class ContentNegotiationManager
extends Object
implements ContentNegotiationStrategy, MediaTypeFileExtensionResolver
```
Central class to determine requested media types for a request. This is done by delegating to a list of configured ContentNegotiationStrategy instances.
Also provides methods to look up file extensions for a media type. This is done by delegating to the list of configured MediaTypeFileExtensionResolver instances.
Since:
3.2
Author:
Rossen Stoyanchev, Juergen Hoeller

Constructor Summary

Constructors
Constructor	Description
`ContentNegotiationManager()`	Create a default instance with a `HeaderContentNegotiationStrategy`.
`ContentNegotiationManager(Collection<ContentNegotiationStrategy> strategies)`	A collection-based alternative to `ContentNegotiationManager(ContentNegotiationStrategy...)`.
`ContentNegotiationManager(ContentNegotiationStrategy... strategies)`	Create an instance with the given list of `ContentNegotiationStrategy` strategies each of which may also be an instance of `MediaTypeFileExtensionResolver`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addFileExtensionResolvers(MediaTypeFileExtensionResolver... resolvers)`	Register more `MediaTypeFileExtensionResolver` instances in addition to those detected at construction.
`List<String>`	`getAllFileExtensions()`	Return all registered file extensions.
`List<ContentNegotiationStrategy>`	`getStrategies()`	Return the configured content negotiation strategies.
`<T extends ContentNegotiationStrategy> T`	`getStrategy(Class<T> strategyType)`	Find a `ContentNegotiationStrategy` of the given type.
`List<String>`	`resolveFileExtensions(MediaType mediaType)`	Resolve the given media type to a list of path extensions.
`List<MediaType>`	`resolveMediaTypes(NativeWebRequest request)`	Resolve the given request to a list of media types.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ContentNegotiationManager
```
public ContentNegotiationManager(ContentNegotiationStrategy... strategies)
```
    Create an instance with the given list of ContentNegotiationStrategy strategies each of which may also be an instance of MediaTypeFileExtensionResolver.
    Parameters:
    strategies - the strategies to use
  - ContentNegotiationManager
```
public ContentNegotiationManager(Collection<ContentNegotiationStrategy> strategies)
```
    A collection-based alternative to ContentNegotiationManager(ContentNegotiationStrategy...).
    Parameters:
    strategies - the strategies to use
    Since:
    3.2.2
  - ContentNegotiationManager
```
public ContentNegotiationManager()
```
    Create a default instance with a HeaderContentNegotiationStrategy.
- Method Detail
  - getStrategies
```
public List<ContentNegotiationStrategy> getStrategies()
```
    Return the configured content negotiation strategies.
    Since:
    3.2.16
  - getStrategy
```
public <T extends ContentNegotiationStrategy> T getStrategy(Class<T> strategyType)
```
    Find a ContentNegotiationStrategy of the given type.
    Parameters:
    strategyType - the strategy type
    Returns:
    the first matching strategy, or null if none
    Since:
    4.3
  - addFileExtensionResolvers
```
public void addFileExtensionResolvers(MediaTypeFileExtensionResolver... resolvers)
```
    Register more MediaTypeFileExtensionResolver instances in addition to those detected at construction.
    Parameters:
    resolvers - the resolvers to add
  - resolveMediaTypes
```
public List<MediaType> resolveMediaTypes(NativeWebRequest request)
                                  throws HttpMediaTypeNotAcceptableException
```
    Description copied from interface: ContentNegotiationStrategy
    Resolve the given request to a list of media types. The returned list is ordered by specificity first and by quality parameter second.
    Specified by:
    resolveMediaTypes in interface ContentNegotiationStrategy
    Parameters:
    request - the current request
    Returns:
    the requested media types or an empty list (never null)
    Throws:
    HttpMediaTypeNotAcceptableException - if the requested media types cannot be parsed
  - resolveFileExtensions
```
public List<String> resolveFileExtensions(MediaType mediaType)
```
    Description copied from interface: MediaTypeFileExtensionResolver
    Resolve the given media type to a list of path extensions.
    Specified by:
    resolveFileExtensions in interface MediaTypeFileExtensionResolver
    Parameters:
    mediaType - the media type to resolve
    Returns:
    a list of extensions or an empty list (never null)
  - getAllFileExtensions
```
public List<String> getAllFileExtensions()
```
    Return all registered file extensions.
    At startup this method returns extensions explicitly registered with either PathExtensionContentNegotiationStrategy or ParameterContentNegotiationStrategy. At runtime if there is a "path extension" strategy and its useJaf property is set to "true", the list of extensions may increase as file extensions are resolved via JAF and cached.
    Specified by:
    getAllFileExtensions in interface MediaTypeFileExtensionResolver
    Returns:
    a list of extensions or an empty list (never null)

Class ContentNegotiationManager

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ContentNegotiationManager

ContentNegotiationManager

ContentNegotiationManager

Method Detail

getStrategies

getStrategy

addFileExtensionResolvers

resolveMediaTypes

resolveFileExtensions

getAllFileExtensions