Java specifies that it is a security violation to print from a regular (untrusted) applet, just as it is a security violation to read or write files on the user's machine. As a result, Java will automatically prompt the user with "An applet would like to print. Is this OK?", so the user can say "yes" or "no". In order to print from an applet without this prompt, you need to "sign" your applet or set up the security policy on the user's machine to grant your applet the printing privilege.
it is difficult to print from an applet and should be avoided whenever possible, if there is any other way to do what you are trying to do, i sugest you do it that way, instead of printing through the applet.
posted 14 years ago
Originally posted by tommy k. lee: "An applet would like to print. Is this OK?" ...
Even if, I get this message for printing from unsigned applets that will be fine. But I could never get even this message.
A PrintServiceLookup implementor is recommended to check for the SecurityManager.checkPrintJobAccess() to deny access to untrusted code. Following this recommended policy means that untrusted code may not be able to locate any print services. Downloaded applets are the most common example of untrusted code.