📄 computespeed.jsp

📁 servlet与jsp核心编程书籍源码部分

💻 JSP

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- 
Example of using error pages (e.g. when divide by zero
or number format exception occurs on this page). 
   
Taken from Core Servlets and JavaServer Pages
from Prentice Hall and Sun Microsystems Press,
http://www.coreservlets.com/.
&copy; 2000 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="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.valueOf(value).doubleValue());
}
%>

<% 
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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