The first question, as we say, add a little confusion enough. I will not have a lot on google. Second question, limit the number of login restrictions on the general is not an application server, at least I m not, I write a cage, the cage holds the information of the registered operator, each time you log the time, by the spring interceptor check (check: Get the maximum limit in the license, the retainer is the number of the operator, the form of a traversal, counting, simple not much to say), the log on the number of parity If you exceed the number of throws an exception limit logon Oh. Third, MD5 or can not practice to encrypt it using two algorithms, double insurance, get our unit is only the MD5, in fact, I feel that most of the crack MD5 are taken to the collision law can also be simple , if the number of bytes is more difficult to crack.

how-to-create-J2EE-license.doc

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