troubleshooting Question

How do I check duplicate login using servlet?

Avatar of mchicken
mchicken asked on
JavaJava EE
28 Comments1 Solution1044 ViewsLast Modified:
Dear all,

I have a marking system which would limit only one login per account. i.e. When a user once login the system, it don't have permission to login to the system again using the same user/password unless he has logout the system.

I think the mechanism is to store all the user name to an object. Then check whether the user name has already existed in that object or not.

The problem is I don't have idea on how to implement it. Can anyone give me suggestion?

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