[JSP Learning Notes] JSP basic knowledge of data initialization, synchronization

For all of the data required by all users, and do not have to read from the database every time, only the first time to read out to memory, then create a new servlet, delete the servlet mappings all users can not access, so need to add configuration to the servlet

Indicates that the service is started and initialized

Initialization of data in Servlet init method (Doget dopost set NULL)

Foreground output Code

For changes in the data needs to be synchronized can be modified when the completion of synchronization, or synchronization can be timed.

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Like the data in the session.

[JSP Learning Notes] JSP basic knowledge of data initialization, synchronization