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View Code? Open in Web Editor NEWA JetDirect/PJL Library for Java
License: Other
A JetDirect/PJL Library for Java
License: Other
This is a little library for talking PJL to HP JetDirect printers. It may be used to talk PJL to other printers that understand PJL, but I have never tested that, nor do I have a need to. You may ask, why would anyone want to talk directly to a printer? Being able to talk directly to the printer allows you to micromanage job progress. This is important in applications where each paper printed is highly valuable and duplicates or lack of printing could be problematic. For example, I have used it for a (proprietary) check printing system, and I am able to tell when each newly printed check rolls out onto the top bin. Being able to tell when this happens allows me to mark it as printed in the system as it happens to prevent it from being printed again. I can also watch for out of paper events, paper jams, or job cancellations and deal with them gracefully. In addition, Since I am talking to the printer, I can store postscript dictionaries on the printer, and ask the printer what it has in memory to find out what I may need to load before sending the job, saving precious bandwidth on printers that live far across a WAN. All of these things are difficult to do with the extra layer of abstraction of a print queue between the application and printer. Please see test/ExampleJob for an example of using this library. There is also a testng net.lump.print.TestPrinting which has more examples.
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