📄 portal.jsp
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<%-- * Copyright (c) 2000 David Flanagan. All rights reserved. * This code is from the book Java Examples in a Nutshell, 2nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book (recommended), * visit http://www.davidflanagan.com/javaexamples2.--%><%@page language='java' contentType='text/html'%> <%-- On every JSP page --%><%-- Specify a tag library to use in this file --%><%@taglib uri='http://www.davidflanagan.com/tlds/decor_0_1.tld' prefix='decor'%><%-- Include the JSP code from forcelogin.jsp when this page is compiled --%><%-- The included file checks if the user is logged in, and if not, --%><%-- forwards to the login.jsp page to get a username and password. This --%><%-- ensures that the 'username' attribute is defined in the session. --%><%@include file='forcelogin.jsp'%><%-- Declare a new variable named 'user'. It is an instance of UserBean --%><%-- and it is associated with the session object. If this is a new --%><%-- session, then instantiate the bean and set its 'userName' property --%><%-- to the value of the username from the session. --%><jsp:useBean id='user' scope='session' class='com.davidflanagan.examples.servlet.UserBean'> <jsp:setProperty name='user' property='userName' value='<%=(String)session.getAttribute("username")%>'/></jsp:useBean><%-- Each time this page is displayed, set the 'favoriteColor' property of --%><%-- the 'user' bean. Since no 'value' parameter is supplied, set the --%><%-- property to the 'favoriteColor' parameter of the incoming request, if --%><%-- there is a parameter of that name; otherwise don't set the property. --%><jsp:setProperty name='user' property='favoriteColor'/><%-- Begin to output the page. Note the use of the JSP to include a Java --%><%-- expression within the HTML <body> tag. This is an explicit use of --%><%-- 'user' bean declared above. --%><head><title>The Demo Portal</title></head><body bgcolor='<%=user.getFavoriteColor()%>'><%-- Greet the user by invoking the hello servlet and including its output --%><%-- here. The hello servlet expects to find the username in the session --%><%-- where the login.jsp page stored it. Note the difference between --%><%-- this runtime jsp:include tag and the @include directive used above --%><%-- to include the forcelogin.jsp file at compile-time. --%><div align=center><h1><jsp:include page='servlet/hello' flush='true'/></h1></div><%-- Display a box using our 'decor' tag library, and as its content --%><%-- use the value of the 'customContent' property of the 'user' bean --%><%-- Hopefully, the bean will provide interesting content tailored --%><%-- to the specified user --%><decor:box title='Your Custom Content'> <jsp:getProperty name='user' property='customContent'/></decor:box><%-- Begin another box --%><%-- The content of this box is a table with 2 cells side-by-side --%><p><decor:box color='yellow' margin='15' borderColor='darkgreen' title='Favorite Colors' titleAlign='center' titleColor='#aaffaa'><table><tr><td><%-- The first cell is another box. It displays some text and the value--%><%-- of the 'favoriteColor' property of the 'user' bean --%><decor:box color='pink' margin='20'>Your favorite color is: <jsp:getProperty name='user' property='favoriteColor'/></decor:box></td><%-- This is the second cell of the table. It contains a form for --%><%-- selecting a favorite color. Note the technique used to output the --%><%-- <select> element of the form. --%><td><form method='post'> <%-- Begin the form --%><select name='favoriteColor'> <%-- Begin a <select> object --%><% // Begin a Java scriptlet// Ask the bean for the list of color choices, and the user's favoriteString[] colors = user.getColorChoices();String favorite = user.getFavoriteColor();// Now start looping through the list of colors. The body of this loop// is the HTML and JSP code below.for(int i = 0; i < colors.length; i++) {%> <%-- End the scriptlet --%> <%-- Each time through the loop, we'll output an <option> element --%> <%-- Note the use of JSP <%=...%> expression tags to customize this --%> <%-- option tag for each iteration of the loop --%> <option value='<%=colors[i]%>' <%=(colors[i].equals(favorite))?"selected":""%> > <%=colors[i]%> <%-- Label of <option> element --%> </option><%}%> <%-- End the for loop --%></select> <%-- End the <select> object --%><input type=submit value='Select'> <%-- Submit button for the form --%></form> <%-- End the form--%></td></tr></table> <%-- End of 2nd cell and the table --%></decor:box> <%-- End of the box --%><%-- Begin a new box. This one also contains a 2-cell table --%><br><decor:box title='Logout when Done' color='lightblue'><table><tr><td valign=top><%-- The first table cell is a simple form that allows the user to logout --%><%-- See Logout.java for details --%><form action='servlet/logout' method='post'> <input type=hidden name='page' value='../portal.jsp'> <font face='helvetica'><b><input type='submit' value='Logout'></b></font></form><%-- The second item in the box is another box that displays counts --%><%-- We use jsp:include twice more to invoke the Counter servlet. --%><%-- Note that for the 2nd inclusion, we rely on the fact that the web.xml --%><%-- file maps any URL ending in ".count" to the Counter servlet --%></td><td valign=top><decor:box color='#a0a0c0' margin='5' borderWidth='1'>You have visited <jsp:include page='servlet/counter' flush='true'> <jsp:param name='counter' value='<%="portaluser_"+session.getAttribute("username")%>'/> </jsp:include>times. The portal has been visited <jsp:include page='portal.jsp.count' flush='true'/>times.</decor:box></td></tr></table></decor:box>⌨️ 快捷键说明
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