computespeed.htm

来自「servletjsp一些应用程序」· HTM 代码 · 共 41 行

HTM
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- 
Example of using error pages (e.g. when
number format exception occurs on this page). 
   
Taken from Core Servlets and JavaServer Pages 2nd Edition
from Prentice Hall and Sun Microsystems Press,
http://www.coreservlets.com/.
(C) 2003 Marty Hall; may be freely used or adapted.
-->
<HTML>
<HEAD>
<TITLE>Computing Speed</TITLE>
<LINK REL=STYLESHEET
      HREF="JSP-Styles.css"
      TYPE="text/css">
</HEAD>
<BODY>
<%@ page errorPage="/WEB-INF/SpeedErrors.jsp" %>
<TABLE BORDER=5 ALIGN="CENTER">
  <TR><TH CLASS="TITLE">
      Computing Speed</TABLE>
<%! 
// Note lack of try/catch for NumberFormatException if
// value is null or malformed.

private double toDouble(String value) {
  return(Double.parseDouble(value));
}
%>
<% 
double furlongs = toDouble(request.getParameter("furlongs")); 
double fortnights = toDouble(request.getParameter("fortnights"));
double speed = furlongs/fortnights;
%>
<UL>
  <LI>Distance: <%= furlongs %> furlongs.
  <LI>Time: <%= fortnights %> fortnights.
  <LI>Speed: <%= speed %> furlongs per fortnight.
</UL>
</BODY></HTML>

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