Java in a Nutshell, 5th Edition [Electronic resources] نسخه متنی

This class is a subclass of
DeflaterOutputStream that writes data in ZIP file
format to an output stream. Before writing any data to the
ZipOutputStream, you must begin an entry within
the ZIP file with putNextEntry( ). The
ZipEntry object passed to this method should
specify at least a name for the entry. Once you have begun an entry
with putNextEntry( ), you can write the contents
of that entry with the write( ) methods. When you
reach the end of an entry, you can begin a new one by calling
putNextEntry( ) again, you can close the current
entry with closeEntry( ), or you can close the
stream itself with close( ).

Before beginning an entry with
putNextEntry( ), you can set the compression
method and level with setMethod( ) and
setLevel( ). The constants
DEFLATED and STORED are the two
legal values for setMethod( ). If you use
STORED, the entry is stored in the ZIP file
without any compression. If you use DEFLATED, you
can also specify the compression speed/strength tradeoff by passing a
number from 1 to 9 to setLevel( ), where 9 gives
the strongest and slowest level of compression. You can also use the
constants Deflater.BEST_SPEED,
Deflater.BEST_COMPRESSION, and
Deflater.DEFAULT_COMPRESSION with the
setLevel( ) method.

If you are storing an entry without compression, the ZIP file format
requires that you specify, in advance, the entry size and CRC-32
checksum in the ZipEntry object for the entry. An
exception is thrown if these values are not specified or specified
incorrectly.

Figure 16-147. java.util.zip.ZipOutputStream

public class

ZipOutputStream extends DeflaterOutputStream implements ZipConstants {
// Public Constructors
public

ZipOutputStream (java.io.OutputStream

out );
// Public Constants
public static final int

DEFLATED ; =8
public static final int

STORED ; =0
// Public Instance Methods
public void

closeEntry ( ) throws java.io.IOException;
public void

putNextEntry (ZipEntry

e ) throws java.io.IOException;
public void

setComment (String

comment );
public void

setLevel (int

level );
public void

setMethod (int

method );
// Public Methods Overriding DeflaterOutputStream
public void

close ( ) throws java.io.IOException;
public void

finish ( ) throws java.io.IOException;
public void

write (byte[ ]

b , int

off , int

len ) throws java.io.IOException; synchronized
}

Subclasses

java.util.jar.JarOutput Stream