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Java Forum / General / November 2006Licence code storing for java app
Hello, I want to create a app which will have something similar to licence (i.e. user have to enter licence code to run the app). The problem arises when I want to make it that user have to specify it only once. So I need to store somewhere the information, that the app has already been activated. I am thinking about main jar file (as something which can work ,although it is nothing sophisticated), but when I add extra characters at the end then my jar was corrupted :(. Do you know any nice way to do this:)? Thank you! Regards, mark > Hello, > [quoted text clipped - 3 lines] > So I need to store somewhere the information, that the app has already > been activated. I'd store it in a java.util.Properties file in the user directory appropriate for the platform. On *nix that might be ~username/.appname.properties On Windows that might be C:\Documents and Settings\username\Application Data\YourCo\YourApp\appname.properties See also java.util.prefs.Preferences. > I am thinking about main jar file (as something which > can work ,although it is nothing sophisticated), but when I add extra > characters at the end then my jar was corrupted :(. Do you know any > nice way to do this:)? Thank you! I'm pretty sure Application jar files are not intended to be used for storing volatile data like user preferences. > when I add extra characters at the end then my jar was corrupted :(. Do > you know any nice way to do this:)? Thank you! You cannot just add raw characters to the end of a JAR - they must be contained in a file within that JAR. This is a hassle to do inside Java, so follow the advice of others by creating an extra file. One software that I use creates a text file in my home directory with a license code (this also contains expiration information, and whether it is a trial or purchased version). Upon invocation, this software does a checksum on that license code (make sure it wasn't tampered with) and extracts the other encoded information. It also sends out a broadcast message to make sure no other copies with that same license code are currently in use on the network. HTH, La`ie Techie Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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