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

Field Summary
- Fields inherited from interface org.springframework.web.accept.ContentNegotiationStrategy
  MEDIA_TYPE_ALL_LIST

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()`	Get all registered file extensions.
`Map<String,MediaType>`	`getMediaTypeMappings()`	Return all registered lookup key to media type mappings by iterating `MediaTypeFileExtensionResolver`s.
`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 file 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
```
@Nullable
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 ContentNegotiationStrategy.MEDIA_TYPE_ALL_LIST if none were requested.
    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 file 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()
```
    Get 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 useRegisteredExtensionsOnly property is set to "false", the list of extensions may increase as file extensions are resolved via MediaTypeFactory and cached.
    Specified by:
    getAllFileExtensions in interface MediaTypeFileExtensionResolver
    Returns:
    a list of extensions or an empty list (never null)
  - getMediaTypeMappings
```
public Map<String,MediaType> getMediaTypeMappings()
```
    Return all registered lookup key to media type mappings by iterating MediaTypeFileExtensionResolvers.
    Since:
    5.2.4

Class ContentNegotiationManager

Field Summary

Fields inherited from interface org.springframework.web.accept.ContentNegotiationStrategy

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ContentNegotiationManager

ContentNegotiationManager

ContentNegotiationManager

Method Detail

getStrategies

getStrategy

addFileExtensionResolvers

resolveMediaTypes

resolveFileExtensions

getAllFileExtensions

getMediaTypeMappings