Guide on creating a Java Applet , Printing without

问题:

Well I have created a web-based POS to take order. My question is how do I create a Java-Applet;

1. Shows the HTML page & a Print button
2. Print Order without prompting(no dialogue box)

Additional Information : It works like this. The waiter will key the orders from the computer(POS) , when they hit print, it will detect the I.P address of the printer in the kitchen,then print out the orders immediately without prompt. I am actually looking for reference/guide which can help me start on. Any Advise will be helpful as well. Thank you

回答1:

You cannot do that for security reasons. If you could, applets would already have become notorious for printing 10+ pages of 'special offers' when you visit unscrupulous web sites.

OTOH, if the client is willing to accept one prompt at applet start-up, you could digitally sign the code.

回答2:

There is a project that does HTML printing using HTML5 to render the contents to a PNG and Java to print directly, exactly as described in the original post. This project is called "qz-print" (previously called "jzebra") and it offers the digital signature in both self-signed (free) and trusted-signed (at a premium).

It also uses the signed JNLP files as Andrew Thompson has illustrated. (Thanks Andrew, your contributions to Java as a whole have been a great help to Java developers around the world).

https://code.google.com/p/jzebra/