Class AbstractFileResolvingResource

    • Constructor Detail

      • AbstractFileResolvingResource

        public AbstractFileResolvingResource()
    • Method Detail

      • getFile

        public java.io.File getFile()
                             throws java.io.IOException
        This implementation returns a File reference for the underlying class path resource, provided that it refers to a file in the file system.
        Specified by:
        getFile in interface Resource
        Overrides:
        getFile in class AbstractResource
        Returns:
        a File handle for this resource.
        Throws:
        java.io.IOException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system
      • getFileForLastModifiedCheck

        protected java.io.File getFileForLastModifiedCheck()
                                                    throws java.io.IOException
        This implementation determines the underlying File (or jar file, in case of a resource in a jar/zip).
        Overrides:
        getFileForLastModifiedCheck in class AbstractResource
        Returns:
        the File to use for timestamp checking (never null)
        Throws:
        java.io.IOException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system
      • exists

        public boolean exists()
        Description copied from class: AbstractResource
        This implementation checks whether a File can be opened, falling back to whether an InputStream can be opened. This will cover both directories and content resources.
        Specified by:
        exists in interface Resource
        Overrides:
        exists in class AbstractResource
        Returns:
        if exists
      • contentLength

        public long contentLength()
                           throws java.io.IOException
        Description copied from class: AbstractResource
        This implementation reads the entire InputStream to calculate the content length. Subclasses will almost always be able to provide a more optimal version of this, e.g. checking a File length.
        Specified by:
        contentLength in interface Resource
        Overrides:
        contentLength in class AbstractResource
        Returns:
        the content length for this resource.
        Throws:
        java.io.IOException - if the resource cannot be resolved (in the file system or as some other known physical resource type)
        See Also:
        InputStreamResource.getInputStream()
      • customizeConnection

        protected void customizeConnection​(java.net.HttpURLConnection con)
                                    throws java.io.IOException
        Customize the given HttpURLConnection, obtained in the course of an exists(), contentLength() or lastModified() call.

        Sets request method "HEAD" by default. Can be overridden in subclasses.

        Parameters:
        con - the HttpURLConnection to customize
        Throws:
        java.io.IOException - if thrown from HttpURLConnection methods