There are two kinds of printing:
Java’s usual idea of printing is essentially building a virtual screen display and taking a snapshot of it. You build it page by page the same way you build a screen. You don’t emit characters in a stream with embedded control chars the way you did in DOS (Disk Operating System) days.
For the rest of this discussion, I will be mostly referring to the second type printing. Within that, there are three different APIs (Application Programming Interfaces) to choose from.
Programmers were not happy with the AWT (Advanced Windowing Toolkit) print interface and Sun has made been several attempts to replace the API (Application Programming Interface). This has mainly lead to confusion. The key is to get clear on just which printing API you are using and stick to it.
The Java 1.0 JDK (Java Development Kit) does not support printing.Java version 1.1 does, via java.awt.PrintJob. You print using the same techniques you use for drawing on the screen. It is much like drawing a high-res screen the size of a sheet of paper. Components now have a print method to print themselves which is usually the same as the one to draw them on the screen. To handle text you use Canvases and drawString, or TextFields. To get properly aligned text without borders, consider the KL-Group components or Swing.
In Java version 1.1 unsigned Applets could not print. In more recent versions, they can, though the user has to give an ok.
For printing on old JVMs (Java Virtual Machines):
In W95/W98/Me/NT, the print job properties are ignored. They are system dependent. But here is how Sun implements them:
Java version 1.2 or later PrinterJob is similar to PrintJob. It pops up a platform specific dialog box that the end user fills into select options.
I don’t know how you go about setting attributes that the end user would otherwise have to select in the dialog.
Dot matrix printing is especially slow. To be quick, you must send text intermixed with printer-specific formatting commands. You can do that with RTextPrinter. The following hunk of code presumes you have already, through some other process, created a file file.ps full of PostScript printer commands and you want to get it printed on a printer that can print five double-sided copies on size A4 paper.Of course you can always emit your printer codes to a file, then exec a copy to LPTn: command or whatever your specific platform requires. For a network-capable printer you can talk directly to it via a TCP/IP (Transmission Control Protocol/Internet Protocol) socket.
available on the web at:
optional Replicator mirror
Please email your feedback for publication, letters to the editor, errors, omissions, typos, formatting errors, ambiguities, unclear wording, broken/redirected link reports, suggestions to improve this page or comments to Roedy Green : . If you want your message, your name or email kept confidential, not considered for public posting, please explicitly specify that. Unless you state otherwise, I will treat your message as a letter to the editor that I may or may not publish in the feedback section. After that, it will be too late to retract it. If you disagree with something I said, especially when sending an ad-hominem attack, a rant composed mainly of obscenities or a death threat, please quote the offending passage and cite the web page where you found it, tell me why you think it is wrong, and, if possible, provide some supporting evidence. I can’t very well fix erroneous or ambiguous text if I can’t find it.
Your face IP:[22.214.171.124]
|Feedback||You are visitor number 40,899.|