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The browser's refresh button cause trouble

li bei
Greenhorn

Joined: Jul 22, 2007
Posts: 20
Hi all.
I am in trouble with the refresh button now . It is like this:
I have two jsp page ,one called a.jsp ,it has a form ,and post to b.jsp.
b.jsp handles the request, and insert a record to the database,then forward back to a.jsp.At this time ,the page seems to be a.jsp ,but the address of the browser is still b.jsp .If refresh , there is one more record inserted to the database.
I think if use a servlet or struts' action to do the work which b.jsp does,the problem will appear the same.
If use redirect , I can't pass parameters. I have to display a "inserted done!" at the a.jsp if the record is inserted into the database ,or display "error" on the page and write-back the form data just inputed.

I wonder how to resolve this problem .
Thanks in advance.


I am sorry that my English is poor.If there is something wrong with my words,please tell me .Thank you very much.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 42035
    
  64
First of all, for forms that change state (like insert into a database), you should use POST, not GET. Then the browsers will at least warn you that you're about to repeat an action, and give you a chance to cancel, if you reload.

The problem is known as the DoubleSubmitProblem, and one of the ways to avoid it is the PostRedirectGet. There was an excellent article about this in the JavaRanch Journal.


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