org.springframework.core.io

## Class UrlResource

- java.lang.Object
- - org.springframework.core.io.AbstractResource
  - - org.springframework.core.io.AbstractFileResolvingResource
    - - org.springframework.core.io.UrlResource

- All Implemented Interfaces:
    InputStreamSource, Resource

      public class UrlResource
      extends AbstractFileResolvingResource

  `Resource` implementation for `java.net.URL` locators. Obviously supports resolution as URL, and also as File in case of the "file:" protocol.
  Since:
    28.12.2003
  Author:
    Juergen Hoeller
  See Also:
    `URL`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `UrlResource(String path)` Create a new UrlResource based on a URL path.
    `UrlResource(String protocol, String location)` Create a new UrlResource based on a URI specification.
    `UrlResource(String protocol, String location, String fragment)` Create a new UrlResource based on a URI specification.
    `UrlResource(URI uri)` Create a new UrlResource based on the given URI object.
    `UrlResource(URL url)` Create a new UrlResource based on the given URL object.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Resource` | `createRelative(String relativePath)` This implementation creates a UrlResource, applying the given path relative to the path of the underlying URL of this resource descriptor.
    `boolean` | `equals(Object obj)` This implementation compares the underlying URL references.
    `String` | `getDescription()` This implementation returns a description that includes the URL.
    `File` | `getFile()` This implementation returns a File reference for the underlying URL/URI, provided that it refers to a file in the file system.
    `String` | `getFilename()` This implementation returns the name of the file that this URL refers to.
    `InputStream` | `getInputStream()` This implementation opens an InputStream for the given URL.
    `URI` | `getURI()` This implementation returns the underlying URI directly, if possible.
    `URL` | `getURL()` This implementation returns the underlying URL reference.
    `int` | `hashCode()` This implementation returns the hash code of the underlying URL reference.

    - ### Methods inherited from class org.springframework.core.io.AbstractFileResolvingResource

      `contentLength, exists, getFile, getFileForLastModifiedCheck, isReadable, lastModified`

    - ### Methods inherited from class org.springframework.core.io.AbstractResource

      `isOpen, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### UrlResource

          public UrlResource(URI uri)
                      throws MalformedURLException

      Create a new UrlResource based on the given URI object.
      Parameters:
        `uri` - a URI
      Throws:
        `MalformedURLException` - if the given URL path is not valid

    - #### UrlResource

          public UrlResource(URL url)

      Create a new UrlResource based on the given URL object.
      Parameters:
        `url` - a URL

    - #### UrlResource

          public UrlResource(String path)
                      throws MalformedURLException

      Create a new UrlResource based on a URL path.

      Note: The given path needs to be pre-encoded if necessary.

      Parameters:
        `path` - a URL path
      Throws:
        `MalformedURLException` - if the given URL path is not valid
      See Also:
        `URL.URL(String)`

    - #### UrlResource

          public UrlResource(String protocol,
                     String location)
                      throws MalformedURLException

      Create a new UrlResource based on a URI specification.

      The given parts will automatically get encoded if necessary.

      Parameters:
        `protocol` - the URL protocol to use (e.g. "jar" or "file" - without colon); also known as "scheme"
        `location` - the location (e.g. the file path within that protocol); also known as "scheme-specific part"
      Throws:
        `MalformedURLException` - if the given URL specification is not valid
      See Also:
        `URI.URI(String, String, String)`

    - #### UrlResource

          public UrlResource(String protocol,
                     String location,
                     String fragment)
                      throws MalformedURLException

      Create a new UrlResource based on a URI specification.

      The given parts will automatically get encoded if necessary.

      Parameters:
        `protocol` - the URL protocol to use (e.g. "jar" or "file" - without colon); also known as "scheme"
        `location` - the location (e.g. the file path within that protocol); also known as "scheme-specific part"
        `fragment` - the fragment within that location (e.g. anchor on an HTML page, as following after a "#" separator)
      Throws:
        `MalformedURLException` - if the given URL specification is not valid
      See Also:
        `URI.URI(String, String, String)`

  - ### Method Detail

    - #### getInputStream

          public InputStream getInputStream()
                                     throws IOException

      This implementation opens an InputStream for the given URL. It sets the "UseCaches" flag to `false`, mainly to avoid jar file locking on Windows.
      Returns:
        the input stream for the underlying resource (must not be `null`)
      Throws:
        `IOException` - if the stream could not be opened
      See Also:
        `URL.openConnection()`, `URLConnection.setUseCaches(boolean)`, `URLConnection.getInputStream()`

    - #### getURL

          public URL getURL()
                     throws IOException

      This implementation returns the underlying URL reference.
      Specified by:
        `getURL` in interface `Resource`
      Overrides:
        `getURL` in class `AbstractResource`
      Throws:
        `IOException` - if the resource cannot be resolved as URL, i.e. if the resource is not available as descriptor

    - #### getURI

          public URI getURI()
                     throws IOException

      This implementation returns the underlying URI directly, if possible.
      Specified by:
        `getURI` in interface `Resource`
      Overrides:
        `getURI` in class `AbstractResource`
      Throws:
        `IOException` - if the resource cannot be resolved as URI, i.e. if the resource is not available as descriptor

    - #### getFile

          public File getFile()
                       throws IOException

      This implementation returns a File reference for the underlying URL/URI, provided that it refers to a file in the file system.
      Specified by:
        `getFile` in interface `Resource`
      Overrides:
        `getFile` in class `AbstractFileResolvingResource`
      Throws:
        `IOException` - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system
      See Also:
        `ResourceUtils.getFile(java.net.URL, String)`

    - #### createRelative

          public Resource createRelative(String relativePath)
                                  throws MalformedURLException

      This implementation creates a UrlResource, applying the given path relative to the path of the underlying URL of this resource descriptor.
      Specified by:
        `createRelative` in interface `Resource`
      Overrides:
        `createRelative` in class `AbstractResource`
      Parameters:
        `relativePath` - the relative path (relative to this resource)
      Returns:
        the resource handle for the relative resource
      Throws:
        `MalformedURLException`
      See Also:
        `URL.URL(java.net.URL, String)`

    - #### getFilename

          public String getFilename()

      This implementation returns the name of the file that this URL refers to.
      Specified by:
        `getFilename` in interface `Resource`
      Overrides:
        `getFilename` in class `AbstractResource`
      See Also:
        `URL.getFile()`, `File.getName()`

    - #### getDescription

          public String getDescription()

      This implementation returns a description that includes the URL.
      See Also:
        `Object.toString()`

    - #### equals

          public boolean equals(Object obj)

      This implementation compares the underlying URL references.
      Overrides:
        `equals` in class `AbstractResource`
      See Also:
        `Resource.getDescription()`

    - #### hashCode

          public int hashCode()

      This implementation returns the hash code of the underlying URL reference.
      Overrides:
        `hashCode` in class `AbstractResource`
      See Also:
        `Resource.getDescription()`