解压tar包工具UntarUtil（1）

public class UntarUtil extends ExpandUtil
{
    private UntarCompressionMethod compression = new UntarCompressionMethod();
   
    /**
     * Set decompression algorithm to use; default=none.
     *
     * Allowable values are
     * <ul>
     *   <li>none - no compression
     *   <li>gzip - Gzip compression
     *   <li>bzip2 - Bzip2 compression
     * </ul>
     *
     * @param method compression method
     */
    public void setCompression(UntarCompressionMethod method)
    {
        compression = method;
    }