April 1997
Intermediate to advanced
1074 pages
22h 46m
English
Content preview from Java AWT Reference
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17
Printing
In this chapter:
- PrintGraphics Interface
- PrintJob Class
- Component Methods
- Printing Example
- Printing Arbitrary Content
Java 1.1 introduces the ability to print, a capability that was sadly missing in Java 1.0, even though the Component class had print() and printAll() methods. However, it is possible to print arbitrary content, including multipage documents. The printing facility in Java 1.1 is designed primarily to let a program print its display area or any of the components within its display.
Printing is implemented with the help of one public interface, PrintGraphics, and one public class, PrintJob, of AWT. The real work is hidden behind classes provided with the toolkit for your platform. On Windows NT/95 platforms, these classes are sun.awt.windows.WPrintGraphics and sun.awt.windows.WPrintJob. Other platforms have similarly named classes.
Printing from an applet has security implications and is restricted by the SecurityManager. It is reasonable to suppose that a browser will make it possible to print a page containing an applet; in fact, Netscape has done so ever since Navigator 3.0. However, this ability might not take advantage of Java's printing facility. It isn't reasonable to suppose that an applet will be able to initiate a print job on its own. You might allow a signed applet coming from a trusted source to do so, but you wouldn't want to give any random applet access to your printer. (If you don't understand why, imagine the potential for abuse.) ...
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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.