Figure 77 shows how we implemented this to process an HTML form.
. . .
Figure 77. Invoking a servlet that will process a form
In our servlet, called AccessUserstuf, we indicate what action is to be taken
by adding a hidden parameter in the form. In Figure 77, this hidden parameter
is called action and indicates that this form will be processed as a login. This
action parameter indicates whether this is a login, update, registration, or
other action. This code allows us to code only one servlet to perform various
functions. Generating dynamic HTML
The servlet, AccessUserstuf, with the hidden parameter set to login, verifies
that the user is valid. If an error occurs during this validation, the servlet has
to be able to communicate this back to the calling JSP. We chose to
implement HttpSession objects to enable maintaining the connection
information (see Section 3.5.2,  Maintaining state in HTTP  on page 81). The
servlet puts the information into the HttpSession object and calls a JSP file.
The JSP file then retrieves this information as follows:
  Create the session using HttpSession
method to access information
Figure 78 illustrates this method
<% HttpSession session=request.getSession(true);
if (session.getValue("error") !=null){
%> ERROR:<%
Figure 78. Implementing the session object in a JSP
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