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## org.springframework.util
Class ResourceUtils

    java.lang.Object
      org.springframework.util.ResourceUtils

    public abstract class ResourceUtils

extends Object

Utility methods for resolving resource locations to files in the file system. Mainly for internal use within the framework.

Consider using Spring's Resource abstraction in the core package for handling all kinds of file resources in a uniform manner. `ResourceLoader`'s `getResource` method can resolve any location to a `Resource` object, which in turn allows to obtain a `java.io.File` in the file system through its `getFile()` method.

The main reason for these utility methods for resource location handling is to support `Log4jConfigurer`, which must be able to resolve resource locations before the logging system has been initialized. Spring' Resource abstraction in the core package, on the other hand, already expects the logging system to be available.

Since:
  1.1.5
Author:
  Juergen Hoeller
See Also:
  `Resource`, `ClassPathResource`, `FileSystemResource`, `UrlResource`, `ResourceLoader`

Field Summary
`static String` | `CLASSPATH_URL_PREFIX` Pseudo URL prefix for loading from the class path: "classpath:"
`static String` | `FILE_URL_PREFIX` URL prefix for loading from the file system: "file:"
`static String` | `JAR_URL_SEPARATOR` Separator between JAR URL and file path within the JAR
`static String` | `URL_PROTOCOL_CODE_SOURCE` URL protocol for an entry from an OC4J jar file: "code-source"
`static String` | `URL_PROTOCOL_FILE` URL protocol for a file in the file system: "file"
`static String` | `URL_PROTOCOL_JAR` URL protocol for an entry from a jar file: "jar"
`static String` | `URL_PROTOCOL_WSJAR` URL protocol for an entry from a WebSphere jar file: "wsjar"
`static String` | `URL_PROTOCOL_ZIP` URL protocol for an entry from a zip file: "zip"

Constructor Summary
`ResourceUtils()`

Method Summary
`static URL` | `extractJarFileURL(URL jarUrl)` Extract the URL for the actual jar file from the given URL (which may point to a resource in a jar file or to a jar file itself).
`static File` | `getFile(String resourceLocation)` Resolve the given resource location to a `java.io.File`, i.e. to a file in the file system.
`static File` | `getFile(URL resourceUrl)` Resolve the given resource URL to a `java.io.File`, i.e. to a file in the file system.
`static File` | `getFile(URL resourceUrl, String description)` Resolve the given resource URL to a `java.io.File`, i.e. to a file in the file system.
`static URL` | `getURL(String resourceLocation)` Resolve the given resource location to a `java.net.URL`.
`static boolean` | `isJarURL(URL url)` Determine whether the given URL points to a resource in a jar file, that is, has protocol "jar", "zip", "wsjar" or "code-source".
`static boolean` | `isUrl(String resourceLocation)` Return whether the given resource location is a URL: either a special "classpath" pseudo URL or a standard URL.

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

Field Detail

### CLASSPATH_URL_PREFIX

    public static final String CLASSPATH_URL_PREFIX

  Pseudo URL prefix for loading from the class path: "classpath:"

  See Also:
    Constant Field Values

### FILE_URL_PREFIX

    public static final String FILE_URL_PREFIX

  URL prefix for loading from the file system: "file:"

  See Also:
    Constant Field Values

### URL_PROTOCOL_FILE

    public static final String URL_PROTOCOL_FILE

  URL protocol for a file in the file system: "file"

  See Also:
    Constant Field Values

### URL_PROTOCOL_JAR

    public static final String URL_PROTOCOL_JAR

  URL protocol for an entry from a jar file: "jar"

  See Also:
    Constant Field Values

### URL_PROTOCOL_ZIP

    public static final String URL_PROTOCOL_ZIP

  URL protocol for an entry from a zip file: "zip"

  See Also:
    Constant Field Values

### URL_PROTOCOL_WSJAR

    public static final String URL_PROTOCOL_WSJAR

  URL protocol for an entry from a WebSphere jar file: "wsjar"

  See Also:
    Constant Field Values

### URL_PROTOCOL_CODE_SOURCE

    public static final String URL_PROTOCOL_CODE_SOURCE

  URL protocol for an entry from an OC4J jar file: "code-source"

  See Also:
    Constant Field Values

### JAR_URL_SEPARATOR

    public static final String JAR_URL_SEPARATOR

  Separator between JAR URL and file path within the JAR

  See Also:
    Constant Field Values

Constructor Detail

### ResourceUtils

    public ResourceUtils()

Method Detail

### isUrl

    public static boolean isUrl(String resourceLocation)

  Return whether the given resource location is a URL: either a special "classpath" pseudo URL or a standard URL.

  Parameters:
    `resourceLocation` - the location String to check
  Returns:
    whether the location qualifies as a URL
  See Also:
    `CLASSPATH_URL_PREFIX`, `URL`

### getURL

    public static URL getURL(String resourceLocation)
                      throws FileNotFoundException

  Resolve the given resource location to a `java.net.URL`.

  Does not check whether the URL actually exists; simply returns the URL that the given location would correspond to.

  Parameters:
    `resourceLocation` - the resource location to resolve: either a "classpath:" pseudo URL, a "file:" URL, or a plain file path
  Returns:
    a corresponding URL object
  Throws:
    `FileNotFoundException` - if the resource cannot be resolved to a URL

### getFile

    public static File getFile(String resourceLocation)
                        throws FileNotFoundException

  Resolve the given resource location to a `java.io.File`, i.e. to a file in the file system.

  Does not check whether the fil actually exists; simply returns the File that the given location would correspond to.

  Parameters:
    `resourceLocation` - the resource location to resolve: either a "classpath:" pseudo URL, a "file:" URL, or a plain file path
  Returns:
    a corresponding File object
  Throws:
    `FileNotFoundException` - if the resource cannot be resolved to a file in the file system

### getFile

    public static File getFile(URL resourceUrl)
                        throws FileNotFoundException

  Resolve the given resource URL to a `java.io.File`, i.e. to a file in the file system.

  Parameters:
    `resourceUrl` - the resource URL to resolve
  Returns:
    a corresponding File object
  Throws:
    `FileNotFoundException` - if the URL cannot be resolved to a file in the file system

### getFile

    public static File getFile(URL resourceUrl,
                               String description)
                        throws FileNotFoundException

  Resolve the given resource URL to a `java.io.File`, i.e. to a file in the file system.

  Parameters:
    `resourceUrl` - the resource URL to resolve
    `description` - a description of the original resource that the URL was created for (for example, a class path location)
  Returns:
    a corresponding File object
  Throws:
    `FileNotFoundException` - if the URL cannot be resolved to a file in the file system

### isJarURL

    public static boolean isJarURL(URL url)

  Determine whether the given URL points to a resource in a jar file, that is, has protocol "jar", "zip", "wsjar" or "code-source".

  "zip" and "wsjar" are used by BEA WebLogic Server and IBM WebSphere, respectively, but can be treated like jar files. The same applies to "code-source" URLs on Oracle OC4J, provided that the path contains a jar separator.

  Parameters:
    `url` - the URL to check
  Returns:
    whether the URL has been identified as a JAR URL

### extractJarFileURL

    public static URL extractJarFileURL(URL jarUrl)
                                 throws MalformedURLException

  Extract the URL for the actual jar file from the given URL (which may point to a resource in a jar file or to a jar file itself).

  Parameters:
    `jarUrl` - the original URL
  Returns:
    the URL for the actual jar file
  Throws:
    `MalformedURLException` - if no valid jar file URL could be extracted

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