Como armazenar dados em SERVLETS

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Remember that you can store data in lots of different places in a servlet. To wit:

  • Local variables - for loop iterators, result sets, and so forth
  • Request attributes - for data that must be passed to other servlets invoked with the RequestDispatcher
  • Session attributes - persists for all future requests from the current user only
  • Instance variables - for data that persists for the life of the servlet, shared with all concurrent users
  • Static variables - for data that persists for the life of the application, shared with all concurrent users -- including any other servlet instances that were instantiated with different init parameters
  • Context attributes - for data that must persist for the life of the application, and be shared with all other servlets

This extract is from http://www.jguru.com/faq/view.jsp?EID=416009