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Ch6 conversational state
- 1. Εξέταση 2ης εργασίας • Παρακαλώ οι παρακάτω να παραμείνουν την 2η ώρα για να συζητήσουμε την εργασία τους 546(alkis), 593 (antonis), 917(thodoros), 935, 941, 959(sotiri), 989, 996(alexandros), 1502(evi), 1557
- 2. 3η εργασία Μελετήστε το 5ο κεφάλαιο του βιβλίου Head First Servlets & JSP, Second Edition, και προσπαθήστε τις ερωτήσεις της εξέτασης. Χρησιμοποιήστε τον σύνδεσμο http://www.datadisk.co.uk/html_docs/ jsp/jsp_mvc_tutorial.htm για να υλοποιήσετε μια web application η οποία θα μας βοηθάει να επιλέξουμε το είδος του καφέ που επιθυμούμε. Καταθέστε την εργασία σας πριν τις 08.00 της Δευτέρας 27 Οκτωβρίου συμπληρώνοντας την παρακάτω φόρμα.
- 3. Εργασία εξαμήνου Δώστε τις προτάσεις σας και συζητήστε τες μαζί μου.
- 5. Conversational state • Web servers have no short-term memory. As soon as they close connection to your session they forget you. • Most of the time this is what you need • Sometimes you do need to keep the conversation with the container alive for awhile. • Keep client specific state across multiple requests
- 6. Implement • Use a stateful session enterprise javabean • Use a database • Use an HttpSession
- 8. Clients & Sessions • HTTP is stateless • HTTPS is not but it is heavy in many respects • Unique IP is not enough
- 10. Cookies
- 11. Let the container do most Get or set HttpSession session = request.getsession();
- 12. Existing or not?
- 14. URL re-writing
- 15. URL re-writing only after encoding
- 16. Summary for get.Session() I want a session for THIS client A session that matches the session ID sent or A new session The session is with the client associated with the request
- 17. You need to do some killing
- 18. Killing Sessions • Authority to kill – Container – You • Ways to kill – timeout – invalidate() – crash
- 19. All sessions Only the session you call from Death by timeout
- 20. Using Cookies • Cookies are sweet because the container takes care of during a session. • You may keep a cookie across sessions too.
- 21. Using Cookies with Servlet API No getCookie(String)
- 22. Example (SET & send)
- 23. Example (GET)
- 24. Cookies are not Headers!
- 25. Milestones
- 26. Session on different VMs Session is not duplicated
- 29. Listeners & API