CS396N - Web Programming |
Spring 2002 |
Chapter 20 - Java Server Pages - JSP |
Example - BGColor.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>Color Testing</TITLE>
</HEAD>
<%
String bgColor = request.getParameter("bgColor");
boolean hasExplicitColor = true;
if (bgColor == null) {
hasExplicitColor = false;
bgColor = "WHITE";
}
%>
<BODY BGCOLOR="<%= bgColor %>">
<H2 ALIGN="CENTER">Color Testing</H2>
<%
if (hasExplicitColor) {
out.println("You supplied an explicit
background color of " +
bgColor + ".");
} else {
out.println("Using default background
color of WHITE. " +
"Supply the bgColor request attribute to try " +
"a standard color or RRGGBB value, or to see " +
"if your browser supports X11 color names.");
}
%>
</BODY>
</HTML>
Example - AccessCounts.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD
HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>JSP Declarations</TITLE>
<META NAME="keywords"
CONTENT="JSP,declarations,JavaServer,Pages,servlets">
<META NAME="description"
CONTENT="A
quick example of JSP declarations.">
<LINK REL=STYLESHEET
HREF="JSP-Styles.css"
TYPE="text/css">
</HEAD>
<BODY>
<H1>JSP Declarations</H1>
<%! private int accessCount = 0; %>
<H2>Accesses to page since server reboot:
<%= ++accessCount %></H2>
</BODY>
</HTML>
Example - ImportAtribute.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!--
Example of the import attribute of the page directive.
-->
<HTML>
<HEAD>
<TITLE>The import Attribute</TITLE>
<LINK REL=STYLESHEET
HREF="JSP-Styles.css"
TYPE="text/css">
</HEAD>
<BODY>
<H2>The import Attribute</H2>
<%-- JSP page directive --%>
<%@ page import="java.util.*,cwp.*"
%>
<%-- JSP Declaration --%>
<%!
private String randomID() {
int num = (int)(Math.random()*10000000.0);
return("id" + num);
}
private final String NO_VALUE = "<I>No Value</I>";
%>
<%-- JSP Scriptlet --%>
<%
Cookie[] cookies = request.getCookies();
String oldID =
ServletUtilities.getCookieValue(cookies,
"userID", NO_VALUE);
if (oldID.equals(NO_VALUE)) {
String newID = randomID();
Cookie cookie = new Cookie("userID", newID);
response.addCookie(cookie);
}
%>
<%-- JSP Expressions --%>
This page was accessed on <%= new Date()
%> with a userID
cookie of <%= oldID %>.
</BODY>
</HTML>
Example
- Excel.jsp
First Last Email Address
Marty Hall hall@corewebprogramming.com
Larry Brown brown@corewebprogramming.com
Bill Gates gates@sun.com
Larry Ellison ellison@microsoft.com
<%@ page contentType="application/vnd.ms-excel"
%>
<%-- There are tabs, not spaces, between
columns. --%>
<BODY>
<TABLE BORDER=5 ALIGN="CENTER">
<TR><TH CLASS="TITLE">
Some Random Page</TABLE>
<P>
Information about our products and services.
<P>
Blah, blah, blah.
<P>
Yadda, yadda, yadda.
<%@ include file="ContactSection.jsp"
%>
</BODY>
</HTML>
ContactSession.jsp
<%@ page import="java.util.Date" %>
<%-- The following become fields in
each servlet that
results from
a JSP page that includes this file. --%>
<%!
private int accessCount = 0;
private Date accessDate = new Date();
private String accessHost = "<I>No
previous access</I>";
%>
<P>
<HR>
This page © 2000
<A HREF="http//www.my-company.com/">my-company.com</A>.
This page has been accessed <%= ++accessCount
%>
times since server reboot. It was last
accessed from
<%= accessHost %> at <%= accessDate
%>.
<% accessHost = request.getRemoteHost();
%>
<% accessDate = new Date(); %>
Example
- WhatsNew.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD
HTML 4.0 Transitional//EN">
<!--
Example of including files at request
time.
Taken from Core Web Programming Java 2
Edition
from Prentice Hall and Sun Microsystems
Press,
http://www.corewebprogramming.com/.
May be freely used or adapted.
-->
<HTML>
<HEAD>
<TITLE>What's New at JspNews.com</TITLE>
<LINK REL=STYLESHEET
HREF="JSP-Styles.css"
TYPE="text/css">
</HEAD>
<BODY>
<TABLE BORDER=5 ALIGN="CENTER">
<TR><TH CLASS="TITLE">
What's
New at JspNews.com</TABLE>
<P>
Here is a summary of our three most recent
news stories:
<OL>
<LI><jsp:include
page="news/Item1.html" flush="true" />
<LI><jsp:include
page="news/Item2.html" flush="true" />
<LI><jsp:include
page="news/Item3.html" flush="true" />
</OL>
</BODY>
</HTML>
Item1.html
<B>Bill Gates acts humble.</B> In a startling and unexpected
development, Microsoft big wig Bill Gates put on an open act
of
humility yesterday.
<A HREF="http://www.microsoft.com/Never.html">More details...</A>
Item2.html
<B>Scott McNealy acts serious.</B>
In an unexpected twist,
wisecracking Sun head Scott McNealy was
sober and subdued at
yesterday's meeting.
<A HREF="http://www.sun.com/Imposter.html">More
details...</A>
Item3.html
<B>Larry Ellison acts conciliatory.</B> Catching his competitors
off guard yesterday, Oracle prez Larry Ellison referred to his
rivals in friendly and respectful terms.
<A HREF="http://www.oracle.com/Mistake.html">More details...</A>