java.util.jar
Class JarOutputStream

java.lang.Object
  java.io.OutputStream
      java.io.FilterOutputStream
          java.util.zip.DeflaterOutputStream
              java.util.zip.ZipOutputStream
                  java.util.jar.JarOutputStream

All Implemented Interfaces:

ZipConstants

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

Author:

David Connelly

See Also:

Manifest, ZipOutputStream

Field Summary

private boolean	firstEntry
private static int	JAR_MAGIC

Fields inherited from class java.util.zip.ZipOutputStream

CENATT, CENATX, CENCOM, CENCRC, CENDSK, CENEXT, CENFLG, CENHDR, CENHOW, CENLEN, CENNAM, CENOFF, CENSIG, CENSIZ, CENTIM, CENVEM, CENVER, DEFLATED, ENDCOM, ENDHDR, ENDOFF, ENDSIG, ENDSIZ, ENDSUB, ENDTOT, EXTCRC, EXTHDR, EXTLEN, EXTSIG, EXTSIZ, LOCCRC, LOCEXT, LOCFLG, LOCHDR, LOCHOW, LOCLEN, LOCNAM, LOCSIG, LOCSIZ, LOCTIM, LOCVER, STORED

Fields inherited from class java.util.zip.DeflaterOutputStream

buf, def

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

JarOutputStream(OutputStream out)
Creates a new JarOutputStream with no manifest.

JarOutputStream(OutputStream out, Manifest man)
Creates a new JarOutputStream with the specified Manifest.

Method Summary

private static int	get16(byte[] b, int off)
private static boolean	hasMagic(byte[] edata)
void	putNextEntry(ZipEntry ze) Begins writing a new JAR file entry and positions the stream to the start of the entry data.
private static void	set16(byte[] b, int off, int value)

Methods inherited from class java.util.zip.ZipOutputStream

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

Methods inherited from class java.util.zip.DeflaterOutputStream

deflate, write

Methods inherited from class java.io.FilterOutputStream

flush, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

JAR_MAGIC

private static final int JAR_MAGIC

See Also:

Constant Field Values

firstEntry

private boolean firstEntry

Constructor Detail

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 Detail

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. 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

hasMagic

private static boolean hasMagic(byte[] edata)

get16

private static int get16(byte[] b,
                         int off)

set16

private static void set16(byte[] b,
                          int off,
                          int value)