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

This class allows a JAR file to be read
from an input stream. It extends
java.util.ZipInputStream and is used much like
that class is used. To create a JarInputStream,
simply specify the InputStream from which to read.
If you do not want the JarInputStream to attempt
to verify any digital signatures contained in the JAR file, pass
false as the second argument to the
JarInputStream( ) constructor. The
JarInputStream( ) constructor first reads the JAR
manifest entry, if one exists. The manifest must be the first entry
in the JAR file. getManifest( ) returns the
Manifest object for the JAR file.

Once you have created a
JarInputStream, call getNextJarEntry(
) or getNextEnTRy( ) to obtain the
JarEntry or
java.util.zip.ZipEntry object that describes the
next entry in the JAR file. Then, call a read( )
method (including the inherited versions) to read the contents of
that entry. When the stream reaches the end of file, call
getNextJarEntry( ) again to start reading the next
entry in the file. When all entries have been read from the JAR file,
getNextJarEntry( ) and getNextEntry(
) return null.

Figure 16-111. java.util.jar.JarInputStream

public class

JarInputStream extends java.util.zip.ZipInputStream {
// Public Constructors
public

JarInputStream (java.io.InputStream

in ) throws java.io.IOException;
public

JarInputStream (java.io.InputStream

in , boolean

verify ) throws java.io.IOException;
// Public Instance Methods
public Manifest

getManifest ( );
public JarEntry

getNextJarEntry ( ) throws java.io.IOException;
// Public Methods Overriding ZipInputStream
public java.util.zip.ZipEntry

getNextEntry ( ) throws java.io.IOException;
public int

read (byte[ ]

b , int

off , int

len ) throws java.io.IOException;
// Protected Methods Overriding ZipInputStream
protected java.util.zip.ZipEntry

createZipEntry (String

name );
}

Passed To

Pack200.Packer.pack( )