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This technique is guaranteed to work in all browser environments and security settings, but that s about its only advantage The technique tends to degrade performance if large amounts of data are stored The URLs can become very large, possibly exceeding the size accepted by the Web server Additionally, the URLs aren t secure, being visible in the browser address window and in Web server logs The requirement that every URL on the page has to be rewritten entails a lot of tedious

14:

code and it s easy to overlook a URL in the process Nevertheless, for simple applications, URL rewriting is reliable and easy to implement Note, manually appending parameters to hyperlink URLs isn t commonly done More common is to use the HTTP Session API to do the URL rewriting and, in this case, only a session ID is appended

.

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The most widely used technique for persistent client data storage involves HTTP cookies A cookie is a small, named data element the server passes to a client with a Set-Cookie header as part of the HTTP response The client is expected to store the cookie and return it to the server with a Cookie header on subsequent requests to the same server Along with the name and value, the cookie may contain I An expiration date, after which the client is no long expected to retain the cookie If no date is specified, the cookie expires as soon as the browser session ends I A domain name, such as servernamecom, which restricts the subset of URLs for which the cookie is valid If unspecified, the cookie is returned with all requests to the originating Web server I A path name that further restricts the URL subset I A secure attribute, which, if present, indicates the cookie should only be returned if the connection uses a secure channel, such as SSL Details of the original cookie specification can be found at http://homenetscapecom/ newsref/std/cookie_spechtml Figure 14-2 illustrates how cookies are set and retrieved with HTTP requests and responses First, the Web browser requests a page from the Web server No cookies are involved at this point When the server responds with the requested document, it sends a Set-Cookie header assigning the value fr to a cookie named language The cookie is set to expire in one year The browser reads this header, extracts the cookie information, and stores the name/value pair in its cookie cache, along with the Web server s domain and default path Later, when the user visits the page again, the browser recognizes it previously received a cookie from this server and the cookie hasn t yet expired, and, therefore, sends the cookie back to the server One advantage of cookies over other persistence schemes is they can retain their values after the browser session is over, even after the client computer is rebooted This makes cookies well suited for maintaining users preferences, such as language The application shown in the following enables the user to select the desired language by clicking a hyperlink The selection causes two cookies to be sent to the client: one for language and one for country The next time the user visits the site, the browser.

Figure 14-2

automatically sends the cookies back to the server and the user s preferred language is used in the page

<%@ page session="false" %> <%@ page import="javautil*" %> <jsp:include page="getLocalejsp" flush="true"/> <% ResourceBundle RB = (ResourceBundle) requestgetAttribute("RB"); %> <HTML> <HEAD> <TITLE>Using Cookies to Store Preferences</TITLE> </HEAD> <BODY> <IMG SRC="images/lyric_notepng"><P>

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<HR> <jsp:include page="languageBarjsp" flush="true"/> <H3><%= RBgetString("greeting") %></H3> </BODY> </HTML>

The main application page indexjsp uses <jsp:include> to invoke a utility JSP page that scans the request headers for existing cookies and returns a resource bundle2 for the appropriate language Here is the utility page, getLocalejsp:

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