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Application scope is most useful for objects that need to persist between requests, for objects that must be visible to all users of the application, or for objects that need to be shared between other servlets and JSP pages

Summary

The Web application model doesn t automatically map into the HTTP protocol HTTP is stateless, not remembering anything about the client from one request to the next The Web browser environment also introduces complications in an application, each page depends on its predecessors, but a user may browse pages out of order and leave an application without signaling she is done The solution to the problem is to have the client (browser) remember certain details and remind the server each time it makes a request This can involve the client managing all the data but, in practice, it s more common to see the client remember only an identifier of some kind and have the server use that to retrieve the rest of the data from a database This virtual conversation (virtual because no persistent connection is involved) is commonly called a session This chapter deals with four techniques for session management: I Hidden fields in HTML forms These are simple to use, but can only be transmitted with an HTML form If the user clicks a hyperlink, the hidden fields (and, therefore, the session) are lost I URL rewriting This involves appending the session identifier to all URLs generated by the JSP page Performance-wise, this technique can be expensive I Cookies Small named data elements are sent to the client and returned to the server when the page is revisited Cookies have the advantage that they can persist for an arbitrary length of time, even after the client computer is turned off The disadvantage is some users turn off cookie support because of concerns for privacy

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<%-- Radio buttons for selecting the page --%> <TR> <TD ALIGN=LEFT> <% String which = requestgetParameter("which"); if (which == null) which = TABS[0][0]; String jspToRun = null; for (int i = 0; i < TABSlength; i++) { String tabCode = TABS[i][0]; String tabLabel = TABS[i][1]; String tabJSP = TABS[i][2]; String CHECKED = ""; if (whichequals(tabCode)) { CHECKED = "CHECKED"; jspToRun = tabJSP; } %> <INPUT NAME="which" TYPE="RADIO" VALUE="<%= tabCode %>" <%= CHECKED %> onClick="thisformsubmit()" ><%= tabLabel %> <% } %> <P> </TD> </TR> <TR> <TD ALIGN=CENTER VALIGN=TOP> <%-- Page showing details of the request --%> <jsp:include page="<%= jspToRun %>" flush="true" /> <%-- Resulting table --%> <TABLE BORDER=1 CELLPADDING=3 CELLSPACING=0 WIDTH=600>

<TR> <TH COLSPAN=2 ALIGN=LEFT BGCOLOR="#000000"> <FONT SIZE="+1" COLOR="#FFFFFF"> <%= requestgetAttribute("_table_title") %> </FONT> </TH> </TR> <TR> <TH WIDTH=200 ALIGN=LEFT>Name</TH> <TH WIDTH=400 ALIGN=LEFT>Value</TH> </TR> <% Map entries = (Map) requestgetAttribute("_table_entries"); Iterator iNames = entrieskeySet()iterator(); int row = 0; while (iNameshasNext()) { String name = (String) iNamesnext(); Object value = entriesget(name); %> <TR BGCOLOR="<%= COLORS[row % 2] %>"> <TD ALIGN=LEFT VALIGN=TOP><B><%= name %></B></TD> <TD ALIGN=LEFT VALIGN=TOP><%= value %></TD> </TR> <% row++; } %> </TABLE> <P> </TD> </TR> </TABLE> </FORM> </BODY> </HTML>

As you can see from the output in Figure 3-16, the first role element loses its content and is replaced by an empty tag (<role />).

The categories available for display are coded in a static String array For each category, a two-character abbreviation exists: a label and the name of a JSP page that will extract the desired data There are four categories of attributes: I Request Headers I Parameters

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