📄 guestbook.xtp
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<?xml-stylesheet href='simple-format.xsl'?><!-- - A simple guestbook using a single XTP page and no beans. - - The stylesheet, simple-format.xsl just creates simple page formatting - and automatically inserts response.encodeURL() in forms and anchors. - - The differences between guestbook.xtp and guestbook.jsp are minor. - 1) <%@ page language %> is in the body to make the HTML happy. - 2) <h1>title</h1> is automatically generated. - 3) <form action='<%= response.encodeURL() %>'> is automatically generated - - Because XTP is compiled to JSP, there is no performance penalty over - a JSP page. --><head><title>XTP Guest Book</title></head><body><!-- - JSP declarations must be in the body to make the HTML parser happy --><%@ page language=java import='jsp.*, java.util.*'%><!-- Retrieve the guestbook from the application, creating if necessary --><jsp:useBean id='guestBook' class='java.util.Hashtable' scope=application/><!-- - "controller" code, handling state changes and user input --><%String name = (String) session.getAttribute("name");String user = request.getParameter("Name");String passwd = request.getParameter("Password");if (user == null) user = "";else if ("quidditch".equals(passwd)) { name = user; session.setAttribute("name", name);}String comment = request.getParameter("Comment");if (comment != null && name != null) guestBook.put(name, comment);if (comment == null && name != null) comment = (String) guestBook.get(name);if (comment == null) comment = "";%><!-- - display the guestbook --><table><tr><td width='25%'><em>Name</em><td><em>Comment</em></td><%Enumeration e = guestBook.keys();while (e.hasMoreElements()) { String guestName = (String) e.nextElement(); String guestComment = (String) guestBook.get(guestName); %><tr><td><%= guestName %><td><%= guestComment %></tr><%}%></table><hr><!-- - If the user is logged in, let him change the comment. --><% if (name != null) { %><form action="guestbook.xtp" method='POST'><table><tr><td>Name:<td><%= name %><tr><td>Comment:<td><input size="40" name="Comment" value="<%= comment %>"></table></form><!-- - If the user is not logged in, show him a login form. - The stylesheet automatically URL-encodes the action. --><% } else { %><form action="guestbook.xtp" method="POST"><table><tr><td>Name:<td><input name='Name' value='<%= user %>'><tr><td>Password:<td><input name='Password' type='password'><tr><td>Hint:<td>The password is 'quidditch'<tr><td><input type=submit value='Login'></table></form><% } %></body>⌨️ 快捷键说明
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