Class ZipArchiveOutputStream

  • All Implemented Interfaces:
    java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable
    Direct Known Subclasses:
    JarArchiveOutputStream

    public class ZipArchiveOutputStream
    extends ArchiveOutputStream
    Reimplementation of java.util.zip.ZipOutputStream that does handle the extended functionality of this package, especially internal/external file attributes and extra fields with different layouts for local file data and central directory entries.

    This class will try to use SeekableByteChannel when it knows that the output is going to go to a file.

    If SeekableByteChannel cannot be used, this implementation will use a Data Descriptor to store size and CRC information for DEFLATED entries, this means, you don't need to calculate them yourself. Unfortunately this is not possible for the STORED method, here setting the CRC and uncompressed size information is required before putArchiveEntry(ArchiveEntry) can be called.

    As of Apache Commons Compress 1.3 it transparently supports Zip64 extensions and thus individual entries and archives larger than 4 GB or with more than 65536 entries in most cases but explicit control is provided via setUseZip64(org.apache.commons.compress.archivers.zip.Zip64Mode). If the stream can not use SeekableByteChannel and you try to write a ZipArchiveEntry of unknown size then Zip64 extensions will be disabled by default.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected java.util.zip.Deflater def
      This Deflater object is used for output.
      static int DEFAULT_COMPRESSION
      Default compression level for deflated entries.
      static int DEFLATED
      Compression method for deflated entries.
      static int EFS_FLAG
      Deprecated.
      protected boolean finished
      indicates if this archive is finished.
      static int STORED
      Compression method for stored entries.
    • Constructor Summary

      Constructors 
      Constructor Description
      ZipArchiveOutputStream​(java.io.File file)
      Creates a new ZIP OutputStream writing to a File.
      ZipArchiveOutputStream​(java.io.OutputStream out)
      Creates a new ZIP OutputStream filtering the underlying stream.
      ZipArchiveOutputStream​(java.nio.channels.SeekableByteChannel channel)
      Creates a new ZIP OutputStream writing to a SeekableByteChannel.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void addRawArchiveEntry​(ZipArchiveEntry entry, java.io.InputStream rawStream)
      Adds an archive entry with a raw input stream.
      boolean canWriteEntryData​(ArchiveEntry ae)
      Whether this stream is able to write the given entry.
      void close()
      Closes this output stream and releases any system resources associated with the stream.
      void closeArchiveEntry()
      Writes all necessary data for this entry.
      ArchiveEntry createArchiveEntry​(java.io.File inputFile, java.lang.String entryName)
      Creates a new zip entry taking some information from the given file and using the provided name.
      protected void deflate()
      Writes next block of compressed data to the output stream.
      void finish()
      Finishes the addition of entries to this stream, without closing it.
      void flush()
      Flushes this output stream and forces any buffered output bytes to be written out to the stream.
      java.lang.String getEncoding()
      The encoding to use for file names and the file comment.
      boolean isSeekable()
      This method indicates whether this archive is writing to a seekable stream (i.e., to a random access file).
      void putArchiveEntry​(ArchiveEntry archiveEntry)
      Writes the headers for an archive entry to the output stream.
      void setComment​(java.lang.String comment)
      Set the file comment.
      void setCreateUnicodeExtraFields​(ZipArchiveOutputStream.UnicodeExtraFieldPolicy b)
      Whether to create Unicode Extra Fields.
      void setEncoding​(java.lang.String encoding)
      The encoding to use for file names and the file comment.
      void setFallbackToUTF8​(boolean b)
      Whether to fall back to UTF and the language encoding flag if the file name cannot be encoded using the specified encoding.
      void setLevel​(int level)
      Sets the compression level for subsequent entries.
      void setMethod​(int method)
      Sets the default compression method for subsequent entries.
      void setUseLanguageEncodingFlag​(boolean b)
      Whether to set the language encoding flag if the file name encoding is UTF-8.
      void setUseZip64​(Zip64Mode mode)
      Whether Zip64 extensions will be used.
      void write​(byte[] b, int offset, int length)
      Writes bytes to ZIP entry.
      protected void writeCentralDirectoryEnd()
      Writes the "End of central dir record".
      protected void writeCentralFileHeader​(ZipArchiveEntry ze)
      Writes the central file header entry.
      protected void writeDataDescriptor​(ZipArchiveEntry ze)
      Writes the data descriptor entry.
      protected void writeLocalFileHeader​(ZipArchiveEntry ze)
      Writes the local file header entry
      protected void writeOut​(byte[] data)
      Write bytes to output or random access file.
      protected void writeOut​(byte[] data, int offset, int length)
      Write bytes to output or random access file.
      protected void writeZip64CentralDirectory()
      Writes the "ZIP64 End of central dir record" and "ZIP64 End of central dir locator".
      • Methods inherited from class java.io.OutputStream

        nullOutputStream, write
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • ZipArchiveOutputStream

        public ZipArchiveOutputStream​(java.io.OutputStream out)
        Creates a new ZIP OutputStream filtering the underlying stream.
        Parameters:
        out - the outputstream to zip
      • ZipArchiveOutputStream

        public ZipArchiveOutputStream​(java.io.File file)
                               throws java.io.IOException
        Creates a new ZIP OutputStream writing to a File. Will use random access if possible.
        Parameters:
        file - the file to zip to
        Throws:
        java.io.IOException - on error
      • ZipArchiveOutputStream

        public ZipArchiveOutputStream​(java.nio.channels.SeekableByteChannel channel)
                               throws java.io.IOException
        Creates a new ZIP OutputStream writing to a SeekableByteChannel.

        SeekableInMemoryByteChannel allows you to write to an in-memory archive using random access.

        Parameters:
        channel - the channel to zip to
        Throws:
        java.io.IOException - on error
        Since:
        1.13
    • Method Detail

      • isSeekable

        public boolean isSeekable()
        This method indicates whether this archive is writing to a seekable stream (i.e., to a random access file).

        For seekable streams, you don't need to calculate the CRC or uncompressed size for STORED entries before invoking putArchiveEntry(ArchiveEntry).

        Returns:
        true if seekable
      • getEncoding

        public java.lang.String getEncoding()
        The encoding to use for file names and the file comment.
        Returns:
        null if using the platform's default character encoding.
      • setUseLanguageEncodingFlag

        public void setUseLanguageEncodingFlag​(boolean b)
        Whether to set the language encoding flag if the file name encoding is UTF-8.

        Defaults to true.

        Parameters:
        b - whether to set the language encoding flag if the file name encoding is UTF-8
      • setFallbackToUTF8

        public void setFallbackToUTF8​(boolean b)
        Whether to fall back to UTF and the language encoding flag if the file name cannot be encoded using the specified encoding.

        Defaults to false.

        Parameters:
        b - whether to fall back to UTF and the language encoding flag if the file name cannot be encoded using the specified encoding.
      • addRawArchiveEntry

        public void addRawArchiveEntry​(ZipArchiveEntry entry,
                                       java.io.InputStream rawStream)
                                throws java.io.IOException
        Adds an archive entry with a raw input stream. If crc, size and compressed size are supplied on the entry, these values will be used as-is. Zip64 status is re-established based on the settings in this stream, and the supplied value is ignored. The entry is put and closed immediately.
        Parameters:
        entry - The archive entry to add
        rawStream - The raw input stream of a different entry. May be compressed/encrypted.
        Throws:
        java.io.IOException - If copying fails
      • setComment

        public void setComment​(java.lang.String comment)
        Set the file comment.
        Parameters:
        comment - the comment
      • setLevel

        public void setLevel​(int level)
        Sets the compression level for subsequent entries.

        Default is Deflater.DEFAULT_COMPRESSION.

        Parameters:
        level - the compression level.
        Throws:
        java.lang.IllegalArgumentException - if an invalid compression level is specified.
      • setMethod

        public void setMethod​(int method)
        Sets the default compression method for subsequent entries.

        Default is DEFLATED.

        Parameters:
        method - an int from java.util.zip.ZipEntry
      • canWriteEntryData

        public boolean canWriteEntryData​(ArchiveEntry ae)
        Whether this stream is able to write the given entry.

        May return false if it is set up to use encryption or a compression method that hasn't been implemented yet.

        Overrides:
        canWriteEntryData in class ArchiveOutputStream
        Parameters:
        ae - the entry to test
        Returns:
        This implementation always returns true.
        Since:
        1.1
      • write

        public void write​(byte[] b,
                          int offset,
                          int length)
                   throws java.io.IOException
        Writes bytes to ZIP entry.
        Overrides:
        write in class java.io.OutputStream
        Parameters:
        b - the byte array to write
        offset - the start position to write from
        length - the number of bytes to write
        Throws:
        java.io.IOException - on error
      • close

        public void close()
                   throws java.io.IOException
        Closes this output stream and releases any system resources associated with the stream.
        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Overrides:
        close in class java.io.OutputStream
        Throws:
        java.io.IOException - if an I/O error occurs.
        Zip64RequiredException - if the archive's size exceeds 4 GByte or there are more than 65535 entries inside the archive and setUseZip64(org.apache.commons.compress.archivers.zip.Zip64Mode) is Zip64Mode.Never.
      • flush

        public void flush()
                   throws java.io.IOException
        Flushes this output stream and forces any buffered output bytes to be written out to the stream.
        Specified by:
        flush in interface java.io.Flushable
        Overrides:
        flush in class java.io.OutputStream
        Throws:
        java.io.IOException - if an I/O error occurs.
      • deflate

        protected final void deflate()
                              throws java.io.IOException
        Writes next block of compressed data to the output stream.
        Throws:
        java.io.IOException - on error
      • writeLocalFileHeader

        protected void writeLocalFileHeader​(ZipArchiveEntry ze)
                                     throws java.io.IOException
        Writes the local file header entry
        Parameters:
        ze - the entry to write
        Throws:
        java.io.IOException - on error
      • writeDataDescriptor

        protected void writeDataDescriptor​(ZipArchiveEntry ze)
                                    throws java.io.IOException
        Writes the data descriptor entry.
        Parameters:
        ze - the entry to write
        Throws:
        java.io.IOException - on error
      • writeZip64CentralDirectory

        protected void writeZip64CentralDirectory()
                                           throws java.io.IOException
        Writes the "ZIP64 End of central dir record" and "ZIP64 End of central dir locator".
        Throws:
        java.io.IOException - on error
        Since:
        1.3
      • writeOut

        protected final void writeOut​(byte[] data)
                               throws java.io.IOException
        Write bytes to output or random access file.
        Parameters:
        data - the byte array to write
        Throws:
        java.io.IOException - on error
      • writeOut

        protected final void writeOut​(byte[] data,
                                      int offset,
                                      int length)
                               throws java.io.IOException
        Write bytes to output or random access file.
        Parameters:
        data - the byte array to write
        offset - the start position to write from
        length - the number of bytes to write
        Throws:
        java.io.IOException - on error
      • createArchiveEntry

        public ArchiveEntry createArchiveEntry​(java.io.File inputFile,
                                               java.lang.String entryName)
                                        throws java.io.IOException
        Creates a new zip entry taking some information from the given file and using the provided name.

        The name will be adjusted to end with a forward slash "/" if the file is a directory. If the file is not a directory a potential trailing forward slash will be stripped from the entry name.

        Must not be used if the stream has already been closed.

        Specified by:
        createArchiveEntry in class ArchiveOutputStream
        Parameters:
        inputFile - the file to create the entry from
        entryName - name to use for the entry
        Returns:
        the ArchiveEntry set up with details from the file
        Throws:
        java.io.IOException - if an I/O error occurs