[Java pick up 5] using session to prevent repeated submission of forms

Disclaimer: This article is a reprint from blog: http://www.cnblogs.com/xdp-gacl/p/3859416.html In normal development, if the network speed is relatively slow and the user finds that the server has not responded for half a day after submitting the form, the user may think that he has not submitted the form, and then click the submit button to submit the form again. We must prevent repeated submission of the form in development.

There are the following forms JSP page 1 <% @ page language = "Java" import = "Java. Util. *" pageencoding = "UTF-8"% >