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<P> Click <A HREF="<%= responseencodeURL("Counterjsp") %>">here</A> to visit the page again </BODY> </HTML>
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Each time the page is refreshed, the count is incremented and stored in the session in a new Integer wrapper Note, the hyperlink the user clicks to redisplay the page uses responseencodeURL() to ensure the session tracking works, regardless of whether the user accepts cookies
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In the Cookies section, you learned how an application could allow a user to indicate his language preference, so the rest of the Web pages in that session were displayed in that language The application used cookies so the preference would persist even between sessions If that persistence isn t a requirement, the same thing can be done with the session API The main indexjsp page changes little It still uses a resource bundle for message text, but now it gets it as a session attribute, rather than a request attribute In addition, note the page directive now has session= true
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<%@ page session="true" %> <%@ page import="javautil*" %> <%-- Get the appropriate resource bundle from the session --%> <jsp:include page="getLocalejsp" flush="true"/> <% ResourceBundle RB = (ResourceBundle) sessiongetAttribute("RB"); %> <HTML> <HEAD> <TITLE>Using Session API to Store Language Preference</TITLE> </HEAD> <BODY> <IMG SRC="images/lyric_notepng"><P> <HR>
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<%-- Show a row of hyperlinks with language choices --%> <jsp:include page="languageBarjsp" flush="true"/> <%-- Display greeting in appropriate language --%> <H3><%= RBgetString("greeting") %></H3> </BODY> </HTML>
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The included modules getLocalejsp and setPreferencesjsp are where the real change takes place setPreferences can now do the actual loading of the appropriate resource bundle, based on the language and country parameters it receives
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<%@ page session="true" %> <%@ page import="javautil*" %> <% // Get parameters for language and country String language = requestgetParameter("language"); String country = requestgetParameter("country"); // Get locale-specific resources Locale locale = null; if (language != null && country != null) locale = new Locale(language, country); if (locale == null) locale = LocalegetDefault(); ResourceBundle RB = ResourceBundlegetBundle ("jspcrsessionswelcome", locale); // Store the resource bundle as an attribute in the session sessionsetAttribute("RB", RB); // Redirect back to the calling JSP String cameFrom = requestgetParameter("cameFrom");
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Session and Thread Management
if (cameFrom == null) cameFrom = requestgetContextPath(); cameFrom = responseencodeRedirectURL(cameFrom); responsesendRedirect(cameFrom); %>
The resource bundle is stored as a session attribute and the user is redirected back to the original page Note, the cameFrom URL is passed through the encodeRedirectURL() method, in case cookies are turned off The getLocale JSP page can now simply look in the session for the resource bundle or use the default bundle if none is found
<%@ page session="true" %> <%@ page import="javautil*" %> <% // Get the existing resource bundle from the session, // if one exists ResourceBundle RB = (ResourceBundle) sessiongetAttribute("RB"); // If not, use the default resource bundle if (RB == null) { RB = ResourceBundlegetBundle("jspcrsessionswelcome"); sessionsetAttribute("RB", RB); } %>
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The languageBarjsp page only needs to make one change in two places Because it writes URLs for the main page and setPreferencesjsp, it needs to pass the URLs through responseencodeURL() so session tracking works even if cookies are turned off:
<%@ page session="true" %> <%@ page import="javautil*" %> <% String thisURL = HttpUtilsgetRequestURL(request)toString(); // Encode the session ID into the URL, if necessary
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thisURL = responseencodeURL(thisURL); thisURL = javanetURLEncoderencode(thisURL); Object[][] locales = {new Locale("en", {new Locale("de", {new Locale("es", {new Locale("fr", {new Locale("it", }; { "US"), "DE"), "ES"), "FR"), "IT"),
"English"}, "Deutsch"}, "Espa ol"}, "Fran ais"}, "Italiano"},
for (int i = 0; i < localeslength; i++) { Locale locale = (Locale) locales[i][0]; String name = (String) locales[i][1]; StringBuffer sb = new StringBuffer(); if (i > 0) sbappend(" | "); sbappend("<A HREF=\""); // Encode the session ID into the generated URL StringBuffer sb2 = new StringBuffer(); sb2append("setPreferencesjsp cameFrom="); sb2append(thisURL); sb2append("&language="); sb2append(localegetLanguage()); sb2append("&country="); sb2append(localegetCountry()); String url = sb2toString(); url = responseencodeURL(url); sbappend(url); sbappend("\""); sbappend(">"); sbappend(name); sbappend("</A>"); outprintln(sb); } %>
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