📄 guestbook.jsp
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<%@ page language=java import='java.util.*'%><%!//// A simple guestbook using a single JSP page and no beans.//// This architecture is appropriate for pages that retrieve data,// like a database or an XML file, but don't do much with the user's// input.//// As the page becomes more complicated, encapsulating data sources,// like guestBook, into a bean will make the code more readable.//%><head><title>JSP Guest Book</title></head><body bgcolor='white'><h1>JSP Guest Book</h1><!-- 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 --><%// If already logged in, grab the user name.String name = (String) session.getAttribute("name");// Try to log the user inString user = request.getParameter("Name");String passwd = request.getParameter("Password");if (user == null) user = "";else if ("quidditch".equals(passwd)) { name = user; session.setAttribute("name", name);}// Update the guestbook if the user has a new comment.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><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><td><%= guestComment %></td></tr><%}%></table><hr><!-- - If the user is not logged in, show him a login form. - The action is encoded to allow URL-based sessions. --><% if (name != null) { %><form action='<%= response.encodeURL("guestbook.jsp") %>' method='POST'><table><tr><td>Name:<td><%= name %><tr><td>Comment:<td><input size="40" name="Comment" value="<%= comment %>"></table></form><!- - Otherwise, if the user is logged in, let him change the comment. --><% } else { %><form action="<%= response.encodeURL("guestbook.jsp") %>" 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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