This page summarizes enhancements to the jar and zip support provided in JDK 6.
Jar and Zip Enhancements
Two new compressed streams have been added:
For example, these can be useful if a client wants to send compressed data
over a network.
The data can be compressed into packets with
java.util.zip.DeflaterInputStream: Data read from this stream is
java.util.zip.InflaterOutputStream: Data written to this stream is
and those packets written over the network connection.
The receiving end then reads the compressed packets from the network
connection, and decompresses them by writing to an
On all platforms, zip files can contain more than 64k entries.
On Windows, some limitations have been removed:
File names longer than 256 characters are now supported.
The limitation of just over 2,000 simultaneously open zip files has been
Changes to the
There are two changes to the behavior of the
The timestamps of extracted files are those listed in the archive, instead of
the time of extraction.
When creating a jar, it is possible to specify the entry point for stand-alone
applications bundled into an executable jar file.
The 'e' option specifies the application entry point by creating or overriding
the Main-Class attribute value in the jar file's manifest.