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Java Archive (JAR)
Posted Date: 31 May 2008 Resource Type: Articles/Knowledge Sharing Category: Education
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Posted By: Pournami Member Level: Diamond
Rating:  Points: 1
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Java Archive (JAR) Files
JAR (Java Archive) is a platform-independent file format that aggregates many files into one. Multiple Java applets and their requisite components (.class files, images and sounds) can be bundled in a JAR file and subsequently downloaded to a browser in a single HTTP transaction, greatly improving the download speed. The JAR format also supports compression, which reduces the file size, further improving the download time. In addition, the applet author can digitally sign individual entries in a JAR file to authenticate their origin. It is fully extensible.
What is JAR?
JAR stands for Java ARchive. It is a file format based on the popular ZIP file format and is used for aggregating many files into one. Although JAR can be used as a general archiving tool, the primary motivation for its development was so that Java applets and their requisite components (.class files, images and sounds) can be downloaded to a browser in a single HTTP transaction, rather than opening a new connection for each piece. This greatly improves the speed with which an applet can be loaded onto a web page and begin functioning. The JAR format also supports compression, which reduces the size of the file and improves download time still further. Additionally, individual entries in a JAR file may be digitally signed by the applet author to authenticate their origin.
JAR is:
· the only archive format that is cross-platform
· the only format that handles audio and image files as well as class files
· backward-compatible with existing applet code
· an open standard, fully extendable, and written in java
· the preferred way to bundle the pieces of a java applet
JAR consists of a zip archive, as defined by PKWARE, containing a manifest file and potentially signature files, as defined in the JAR File Specification.
Package java.util.jar Description
Provides classes for reading and writing the JAR (Java ARchive) file format, which is based on the standard ZIP file format with an optional manifest file. The manifest stores meta-information about the JAR file contents and is also used for signing JAR files.
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