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## org.springframework.core.io
Class InputStreamResource

    java.lang.Object
      org.springframework.core.io.AbstractResource
          org.springframework.core.io.InputStreamResource

All Implemented Interfaces:
  InputStreamSource, Resource

    public class InputStreamResource

extends AbstractResource

`Resource` implementation for a given InputStream. Should only be used if no specific Resource implementation is applicable. In particular, prefer `ByteArrayResource` or any of the file-based Resource implementations where possible.

In contrast to other Resource implementations, this is a descriptor for an already opened resource - therefore returning "true" from `isOpen()`. Do not use it if you need to keep the resource descriptor somewhere, or if you need to read a stream multiple times.

Since:
  28.12.2003
Author:
  Juergen Hoeller
See Also:
  `ByteArrayResource`, `ClassPathResource`, `FileSystemResource`, `UrlResource`

Constructor Summary
`InputStreamResource(InputStream inputStream)` Create a new InputStreamResource.
`InputStreamResource(InputStream inputStream, String description)` Create a new InputStreamResource.

Method Summary
`boolean` | `equals(Object obj)` This implementation compares the underlying InputStream.
`boolean` | `exists()` This implementation always returns `true`.
`String` | `getDescription()` This implementation returns the passed-in description, if any.
`InputStream` | `getInputStream()` This implementation throws IllegalStateException if attempting to read the underlying stream multiple times.
`int` | `hashCode()` This implementation returns the hash code of the underlying InputStream.
`boolean` | `isOpen()` This implementation always returns `true`.

Methods inherited from class org.springframework.core.io.AbstractResource
`contentLength, createRelative, getFile, getFileForLastModifiedCheck, getFilename, getURI, getURL, isReadable, lastModified, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### InputStreamResource

    public InputStreamResource(InputStream inputStream)

  Create a new InputStreamResource.

  Parameters:
    `inputStream` - the InputStream to use

### InputStreamResource

    public InputStreamResource(InputStream inputStream,
                               String description)

  Create a new InputStreamResource.

  Parameters:
    `inputStream` - the InputStream to use
    `description` - where the InputStream comes from

Method Detail

### exists

    public boolean exists()

  This implementation always returns `true`.

  Specified by:
    `exists` in interface `Resource`
  Overrides:
    `exists` in class `AbstractResource`

### isOpen

    public boolean isOpen()

  This implementation always returns `true`.

  Specified by:
    `isOpen` in interface `Resource`
  Overrides:
    `isOpen` in class `AbstractResource`

### getInputStream

    public InputStream getInputStream()
                               throws IOException,
                                      IllegalStateException

  This implementation throws IllegalStateException if attempting to read the underlying stream multiple times.

  Returns:
    the input stream for the underlying resource (must not be `null`)
  Throws:
    `IOException` - if the stream could not be opened
    `IllegalStateException`
  See Also:
    `MimeMessageHelper.addAttachment(String, InputStreamSource)`

### getDescription

    public String getDescription()

  This implementation returns the passed-in description, if any.

  See Also:
    `Object.toString()`

### equals

    public boolean equals(Object obj)

  This implementation compares the underlying InputStream.

  Overrides:
    `equals` in class `AbstractResource`
  See Also:
    `Resource.getDescription()`

### hashCode

    public int hashCode()

  This implementation returns the hash code of the underlying InputStream.

  Overrides:
    `hashCode` in class `AbstractResource`
  See Also:
    `Resource.getDescription()`

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