Package org.springframework.http.codec

Class ResourceHttpMessageWriter

java.lang.Object

org.springframework.http.codec.ResourceHttpMessageWriter

All Implemented Interfaces:

HttpMessageWriter<Resource>

public class ResourceHttpMessageWriter
extends Object
implements HttpMessageWriter<Resource>

HttpMessageWriter that can write a Resource.

Also an implementation of HttpMessageWriter with support for writing one or more ResourceRegion's based on the HTTP ranges specified in the request.

For reading to a Resource, use ResourceDecoder wrapped with DecoderHttpMessageReader.

Since:

5.0

Author:

Arjen Poutsma, Brian Clozel, Rossen Stoyanchev

See Also:

• ResourceEncoder
• ResourceRegionEncoder
• HttpRange

Constructor Summary

Constructors

Constructor	Description
ResourceHttpMessageWriter()
ResourceHttpMessageWriter(int bufferSize)

Method Summary

Modifier and Type	Method	Description
void	addHeaders(ReactiveHttpOutputMessage message, Resource resource, MediaType contentType, Map<String,Object> hints)	Adds the default headers for the given resource to the given message.
boolean	canWrite(ResolvableType elementType, MediaType mediaType)	Whether the given object type is supported by this writer.
List<MediaType>	getWritableMediaTypes()	Return the list of media types supported by this Writer.
reactor.core.publisher.Mono<Void>	write(Publisher<? extends Resource> inputStream, ResolvableType actualType, ResolvableType elementType, MediaType mediaType, ServerHttpRequest request, ServerHttpResponse response, Map<String,Object> hints)	Server-side only alternative to HttpMessageWriter.write(Publisher, ResolvableType, MediaType, ReactiveHttpOutputMessage, Map) with additional context available.
reactor.core.publisher.Mono<Void>	write(Publisher<? extends Resource> inputStream, ResolvableType elementType, MediaType mediaType, ReactiveHttpOutputMessage message, Map<String,Object> hints)	Write a given stream of object to the output message.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.springframework.http.codec.HttpMessageWriter

getWritableMediaTypes

Constructor Details

ResourceHttpMessageWriter

public ResourceHttpMessageWriter()

ResourceHttpMessageWriter

public ResourceHttpMessageWriter(int bufferSize)

Method Details

canWrite

public boolean canWrite(ResolvableType elementType,
 @Nullable
 MediaType mediaType)

Description copied from interface: HttpMessageWriter

Whether the given object type is supported by this writer.

Specified by:

canWrite in interface HttpMessageWriter<Resource>

Parameters:

elementType - the type of object to check

mediaType - the media type for the write (possibly null)

Returns:

true if writable, false otherwise

getWritableMediaTypes

public List<MediaType> getWritableMediaTypes()

Description copied from interface: HttpMessageWriter

Return the list of media types supported by this Writer. The list may not apply to every possible target element type and calls to this method should typically be guarded via canWrite(elementType, null). The list may also exclude media types supported only for a specific element type. Alternatively, use HttpMessageWriter.getWritableMediaTypes(ResolvableType) for a more precise list.

Specified by:

getWritableMediaTypes in interface HttpMessageWriter<Resource>

Returns:

the general list of supported media types

write

public reactor.core.publisher.Mono<Void> write(Publisher<? extends Resource> inputStream,
 ResolvableType elementType,
 @Nullable
 MediaType mediaType,
 ReactiveHttpOutputMessage message,
 Map<String,Object> hints)

Description copied from interface: HttpMessageWriter

Write a given stream of object to the output message.

Specified by:

write in interface HttpMessageWriter<Resource>

Parameters:

inputStream - the objects to write

elementType - the type of objects in the stream which must have been previously checked via HttpMessageWriter.canWrite(ResolvableType, MediaType)

mediaType - the content type for the write (possibly null to indicate that the default content type of the writer must be used)

message - the message to write to

hints - additional information about how to encode and write

Returns:

indicates completion or error

addHeaders

public void addHeaders(ReactiveHttpOutputMessage message,
 Resource resource,
 @Nullable
 MediaType contentType,
 Map<String,Object> hints)

Adds the default headers for the given resource to the given message.

Since:

6.0

write

public reactor.core.publisher.Mono<Void> write(Publisher<? extends Resource> inputStream,
 @Nullable
 ResolvableType actualType,
 ResolvableType elementType,
 @Nullable
 MediaType mediaType,
 ServerHttpRequest request,
 ServerHttpResponse response,
 Map<String,Object> hints)

Description copied from interface: HttpMessageWriter

Server-side only alternative to HttpMessageWriter.write(Publisher, ResolvableType, MediaType, ReactiveHttpOutputMessage, Map) with additional context available.

Specified by:

write in interface HttpMessageWriter<Resource>

actualType - the actual return type of the method that returned the value; for annotated controllers, the MethodParameter can be accessed via ResolvableType.getSource().

elementType - the type of Objects in the input stream

mediaType - the content type to use (possibly null indicating the default content type of the writer should be used)

request - the current request

response - the current response

Returns:

a Mono that indicates completion of writing or error