June 1997
Intermediate to advanced
318 pages
8h 17m
English
Content preview from Developing Java BeansBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using JAR Files with HTML
Since JAR files allow us to package a collection of files into one, and to compress the archive, they offer the opportunity to improve the download performance of applets that are retrieved from the Web via HTTP transactions. Basically, we can download the entire archive file in a single HTTP transaction. This reduces the number of trips we must make over the network to get all of the classes and associated files needed for an applet. Without an archive, multiple HTTP transactions may be required to download the required class files. There is also a performance boost because the archive can be compressed, reducing the download time.
The ARCHIVES Attribute
The ARCHIVES
attribute is used in the HTML file to
indicate that an archive file is used. The filename is relative to
the location of the HTML page. Let’s look at the HTML file we
used for running the PickleUser applet from the
previous chapter:
<APPLET ARCHIVE="BeansBook.jar" CODE=PickleUser.class WIDTH=350 HEIGHT=125> </APPLET>
The ARCHIVES attribute specifies that the
BeansBook.jar archive file should be downloaded.
Class files will be searched for in the specified archive first. If
the class is not found in the archive, then the normal mechanism of
searching the server and local file system will be used. Notice that
the CODE attribute is still used to specify the
starting class for the applet.
When you run this HTML file with appletviewer, the
PickleUser class will be loaded from the archive. The applet ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.