Module java.base
Package java.util.jar

Class JarOutputStream

All Implemented Interfaces:
Closeable, Flushable, AutoCloseable

public class JarOutputStream extends ZipOutputStream
The JarOutputStream class is used to write the contents of a JAR file to any output stream. It extends the class java.util.zip.ZipOutputStream with support for writing an optional Manifest entry. The Manifest can be used to specify meta-information about the JAR file and its entries.
Since:
1.2
See Also:
Manifest, ZipOutputStream
  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    Central directory (CEN) header internal file attributes field offset.
    static final int
    Central directory (CEN) header external file attributes field offset.
    static final int
    Central directory (CEN) header comment length field offset.
    static final int
    Central directory (CEN) header uncompressed file crc-32 value field offset.
    static final int
    Central directory (CEN) header disk number start field offset.
    static final int
    Central directory (CEN) header extra field length field offset.
    static final int
    Central directory (CEN) header encrypt, decrypt flags field offset.
    static final int
    Central directory (CEN) header size in bytes (including signature).
    static final int
    Central directory (CEN) header compression method field offset.
    static final int
    Central directory (CEN) header uncompressed size field offset.
    static final int
    Central directory (CEN) header filename length field offset.
    static final int
    Central directory (CEN) header LOC header offset field offset.
    static final long
    Central directory (CEN) header signature.
    static final int
    Central directory (CEN) header compressed size field offset.
    static final int
    Central directory (CEN) header modification time field offset.
    static final int
    Central directory (CEN) header version made by field offset.
    static final int
    Central directory (CEN) header version needed to extract field offset.
    static final int
    End of central directory (END) header zip file comment length field offset.
    static final int
    End of central directory (END) header size in bytes (including signature).
    static final int
    End of central directory (END) header offset for the first CEN header field offset.
    static final long
    End of central directory (END) header signature.
    static final int
    End of central directory (END) header central directory size in bytes field offset.
    static final int
    End of central directory (END) header number of entries on this disk field offset.
    static final int
    End of central directory (END) header total number of entries field offset.
    static final int
    Extra local (EXT) header uncompressed file crc-32 value field offset.
    static final int
    Extra local (EXT) header size in bytes (including signature).
    static final int
    Extra local (EXT) header uncompressed size field offset.
    static final long
    Extra local (EXT) header signature.
    static final int
    Extra local (EXT) header compressed size field offset.
    static final int
    Local file (LOC) header uncompressed file crc-32 value field offset.
    static final int
    Local file (LOC) header extra field length field offset.
    static final int
    Local file (LOC) header general purpose bit flag field offset.
    static final int
    Local file (LOC) header size in bytes (including signature).
    static final int
    Local file (LOC) header compression method field offset.
    static final int
    Local file (LOC) header uncompressed size field offset.
    static final int
    Local file (LOC) header filename length field offset.
    static final long
    Local file (LOC) header signature.
    static final int
    Local file (LOC) header compressed size field offset.
    static final int
    Local file (LOC) header modification time field offset.
    static final int
    Local file (LOC) header version needed to extract field offset.

    Fields declared in class java.util.zip.ZipOutputStream

    DEFLATED, STORED

    Fields declared in class java.util.zip.DeflaterOutputStream

    buf, def

    Fields declared in class java.io.FilterOutputStream

    out
  • Constructor Summary

    Constructors
    Constructor
    Description
    Creates a new JarOutputStream with no manifest.
    Creates a new JarOutputStream with the specified Manifest.
  • Method Summary

    Modifier and Type
    Method
    Description
    void
    Begins writing a new JAR file entry and positions the stream to the start of the entry data.

    Methods declared in class java.util.zip.ZipOutputStream

    close, closeEntry, finish, setComment, setLevel, setMethod, write

    Methods declared in class java.util.zip.DeflaterOutputStream

    deflate, flush, write

    Methods declared in class java.io.FilterOutputStream

    write

    Methods declared in class java.io.OutputStream

    nullOutputStream

    Methods declared in class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Field Details

    • LOCSIG

      static final long LOCSIG
      Local file (LOC) header signature.
      See Also:
      Constant Field Values
    • EXTSIG

      static final long EXTSIG
      Extra local (EXT) header signature.
      See Also:
      Constant Field Values
    • CENSIG

      static final long CENSIG
      Central directory (CEN) header signature.
      See Also:
      Constant Field Values
    • ENDSIG

      static final long ENDSIG
      End of central directory (END) header signature.
      See Also:
      Constant Field Values
    • LOCHDR

      static final int LOCHDR
      Local file (LOC) header size in bytes (including signature).
      See Also:
      Constant Field Values
    • EXTHDR

      static final int EXTHDR
      Extra local (EXT) header size in bytes (including signature).
      See Also:
      Constant Field Values
    • CENHDR

      static final int CENHDR
      Central directory (CEN) header size in bytes (including signature).
      See Also:
      Constant Field Values
    • ENDHDR

      static final int ENDHDR
      End of central directory (END) header size in bytes (including signature).
      See Also:
      Constant Field Values
    • LOCVER

      static final int LOCVER
      Local file (LOC) header version needed to extract field offset.
      See Also:
      Constant Field Values
    • LOCFLG

      static final int LOCFLG
      Local file (LOC) header general purpose bit flag field offset.
      See Also:
      Constant Field Values
    • LOCHOW

      static final int LOCHOW
      Local file (LOC) header compression method field offset.
      See Also:
      Constant Field Values
    • LOCTIM

      static final int LOCTIM
      Local file (LOC) header modification time field offset.
      See Also:
      Constant Field Values
    • LOCCRC

      static final int LOCCRC
      Local file (LOC) header uncompressed file crc-32 value field offset.
      See Also:
      Constant Field Values
    • LOCSIZ

      static final int LOCSIZ
      Local file (LOC) header compressed size field offset.
      See Also:
      Constant Field Values
    • LOCLEN

      static final int LOCLEN
      Local file (LOC) header uncompressed size field offset.
      See Also:
      Constant Field Values
    • LOCNAM

      static final int LOCNAM
      Local file (LOC) header filename length field offset.
      See Also:
      Constant Field Values
    • LOCEXT

      static final int LOCEXT
      Local file (LOC) header extra field length field offset.
      See Also:
      Constant Field Values
    • EXTCRC

      static final int EXTCRC
      Extra local (EXT) header uncompressed file crc-32 value field offset.
      See Also:
      Constant Field Values
    • EXTSIZ

      static final int EXTSIZ
      Extra local (EXT) header compressed size field offset.
      See Also:
      Constant Field Values
    • EXTLEN

      static final int EXTLEN
      Extra local (EXT) header uncompressed size field offset.
      See Also:
      Constant Field Values
    • CENVEM

      static final int CENVEM
      Central directory (CEN) header version made by field offset.
      See Also:
      Constant Field Values
    • CENVER

      static final int CENVER
      Central directory (CEN) header version needed to extract field offset.
      See Also:
      Constant Field Values
    • CENFLG

      static final int CENFLG
      Central directory (CEN) header encrypt, decrypt flags field offset.
      See Also:
      Constant Field Values
    • CENHOW

      static final int CENHOW
      Central directory (CEN) header compression method field offset.
      See Also:
      Constant Field Values
    • CENTIM

      static final int CENTIM
      Central directory (CEN) header modification time field offset.
      See Also:
      Constant Field Values
    • CENCRC

      static final int CENCRC
      Central directory (CEN) header uncompressed file crc-32 value field offset.
      See Also:
      Constant Field Values
    • CENSIZ

      static final int CENSIZ
      Central directory (CEN) header compressed size field offset.
      See Also:
      Constant Field Values
    • CENLEN

      static final int CENLEN
      Central directory (CEN) header uncompressed size field offset.
      See Also:
      Constant Field Values
    • CENNAM

      static final int CENNAM
      Central directory (CEN) header filename length field offset.
      See Also:
      Constant Field Values
    • CENEXT

      static final int CENEXT
      Central directory (CEN) header extra field length field offset.
      See Also:
      Constant Field Values
    • CENCOM

      static final int CENCOM
      Central directory (CEN) header comment length field offset.
      See Also:
      Constant Field Values
    • CENDSK

      static final int CENDSK
      Central directory (CEN) header disk number start field offset.
      See Also:
      Constant Field Values
    • CENATT

      static final int CENATT
      Central directory (CEN) header internal file attributes field offset.
      See Also:
      Constant Field Values
    • CENATX

      static final int CENATX
      Central directory (CEN) header external file attributes field offset.
      See Also:
      Constant Field Values
    • CENOFF

      static final int CENOFF
      Central directory (CEN) header LOC header offset field offset.
      See Also:
      Constant Field Values
    • ENDSUB

      static final int ENDSUB
      End of central directory (END) header number of entries on this disk field offset.
      See Also:
      Constant Field Values
    • ENDTOT

      static final int ENDTOT
      End of central directory (END) header total number of entries field offset.
      See Also:
      Constant Field Values
    • ENDSIZ

      static final int ENDSIZ
      End of central directory (END) header central directory size in bytes field offset.
      See Also:
      Constant Field Values
    • ENDOFF

      static final int ENDOFF
      End of central directory (END) header offset for the first CEN header field offset.
      See Also:
      Constant Field Values
    • ENDCOM

      static final int ENDCOM
      End of central directory (END) header zip file comment length field offset.
      See Also:
      Constant Field Values
  • Constructor Details

    • JarOutputStream

      public JarOutputStream(OutputStream out, Manifest man) throws IOException
      Creates a new JarOutputStream with the specified Manifest. The manifest is written as the first entry to the output stream.
      Parameters:
      out - the actual output stream
      man - the optional Manifest
      Throws:
      IOException - if an I/O error has occurred
    • JarOutputStream

      public JarOutputStream(OutputStream out) throws IOException
      Creates a new JarOutputStream with no manifest.
      Parameters:
      out - the actual output stream
      Throws:
      IOException - if an I/O error has occurred
  • Method Details

    • putNextEntry

      public void putNextEntry(ZipEntry ze) throws IOException
      Begins writing a new JAR file entry and positions the stream to the start of the entry data. This method will also close any previous entry.

      The default compression method will be used if no compression method was specified for the entry. When writing a compressed (DEFLATED) entry, and the compressed size has not been explicitly set with the ZipEntry.setCompressedSize(long) method, then the compressed size will be set to the actual compressed size after deflation.

      The current time will be used if the entry has no set modification time.

      Overrides:
      putNextEntry in class ZipOutputStream
      Parameters:
      ze - the ZIP/JAR entry to be written
      Throws:
      ZipException - if a ZIP error has occurred
      IOException - if an I/O error has occurred