Package org.springframework.core.io

Interface InputStreamSource

All Known Subinterfaces:

ContextResource, HttpResource, HttpResource, MultipartFile, Resource, WritableResource

All Known Implementing Classes:

AbstractFileResolvingResource, AbstractResource, ByteArrayResource, ClassPathResource, DefaultResourceLoader.ClassPathContextResource, DescriptiveResource, EncodedResource, FileSystemResource, FileUrlResource, InputStreamResource, MockMultipartFile, ModuleResource, PathResource, ServletContextResource, TransformedResource, TransformedResource, UrlResource, VfsResource

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface InputStreamSource

Simple interface for objects that are sources for an InputStream.

This is the base interface for Spring's more extensive Resource interface.

For single-use streams, InputStreamResource can be used for any given InputStream. Spring's ByteArrayResource or any file-based Resource implementation can be used as a concrete instance, allowing one to read the underlying content stream multiple times. This makes this interface useful as an abstract content source for mail attachments, for example.

Since:

20.01.2004

Author:

Juergen Hoeller

See Also:

• InputStream
• Resource
• InputStreamResource
• ByteArrayResource

Method Summary

Modifier and Type	Method	Description
InputStream	getInputStream()	Return an InputStream for the content of an underlying resource.

Method Details

getInputStream

InputStream getInputStream()
                    throws IOException

Return an InputStream for the content of an underlying resource.

It is usually expected that every such call creates a fresh stream.

This requirement is particularly important when you consider an API such as JavaMail, which needs to be able to read the stream multiple times when creating mail attachments. For such a use case, it is required that each getInputStream() call returns a fresh stream.

Returns:

the input stream for the underlying resource (must not be null)

Throws:

FileNotFoundException - if the underlying resource does not exist

IOException - if the content stream could not be opened

See Also:

• Resource.isReadable()
• Resource.isOpen()