Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

The next request will submit the data back to the servlet. The servlet
retrieves this hidden value just like any other parameter value, using
the getParameter method.
Let us use an example to demonstrate using hidden values in a form. The
example creates a servlet that processes a registration form. The client
submits the form using the GET method, as shown in Figure 42.21. The
server collects the data in the form, displays them to the client, and
asks the client for confirmation, as shown in Figure 42.22. The client
confirms the data by submitting the request with the hidden values using
the POST method. Finally, the servlet writes the data to a database.
Figure 42.21
The registration form collects user information.
Figure 42.22
The servlet asks the client for confirmation of the input.
Create an HTML form named Registration.html in Listing 42.8 for
collecting the data and sending it to the database using the GET method
for confirmation. This file is almost identical to Listing 42.6,
SimpleRegistration.html except that the action is replaced by
Registration (line 9).
Listing 42.8 Registration.html
28