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Session_and_Cookies.md

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Session_and_Cookies.md

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Session and Cookies


HTTP Protocol

  • client makes a request to the server
  • server processes the request and sends a response to the client
  • After responding, the connection is released >> STATELESS
    • The connection is released to reduce resource waste from persistent connections
      • However, problems arise when the client and server need to maintain a connection state (ex. storing login info, etc.)
      • So Cookie and Session are used when information needs to be maintained on a per-client basis!!

image-20200421025031089


Session & Cookies in Java

Session Cookie
Type javax.servlet.http.HttpSession (interface) javax.servlet.http.Cookie (Class)
Storage Location Stored as Object in server memory
(can reference user-defined classes)		 Stored as file on the client's computer
Storage Format Any Object is possible
(typically Dto, List, etc.)		 String format since stored as a file
Usage Examples User info on Log-In / Shopping cart Recently viewed list / ID saving (auto-login) / 'Don't show again today' in pop-up menus
  • Commonalities
    • Stored globally, so accessible from all JSPs within the project
    • Managed in Map format, so duplicate key values are not allowed