org.springframework.core.io

## 接口 InputStreamSource

- 所有已知子接口:
    ContextResource, Resource, WritableResource
  所有已知实现类:
    AbstractFileResolvingResource, AbstractResource, ByteArrayResource, ClassPathResource, DefaultResourceLoader.ClassPathContextResource, DescriptiveResource, EncodedResource, FileSystemResource, FileUrlResource, InputStreamResource, PathResource, UrlResource, VfsResource

      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.

  从以下版本开始:
    20.01.2004
  作者:
    Juergen Hoeller
  另请参阅:
    `InputStream`, `Resource`, `InputStreamResource`, `ByteArrayResource`

- - ### 方法概要

    所有方法 实例方法 抽象方法
    限定符和类型 | 方法和说明
    --- | ---
    `InputStream` | `getInputStream()` Return an `InputStream` for the content of an underlying resource.

- - ### 方法详细资料

    - #### getInputStream

          InputStream getInputStream()
                              throws IOException

      Return an `InputStream` for the content of an underlying resource.

      It is expected that each 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.

      返回:
        the input stream for the underlying resource (must not be `null`)
      抛出:
        `FileNotFoundException` - if the underlying resource doesn't exist
        `IOException` - if the content stream could not be opened