SaleEntry1.jsp Page that uses the SaleEntry bean, using explicit Java code to read request parameters and assign them to bean properties.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!--
Example of using jsp:setProperty with an explicit value
supplied to the "value" attribute. See SaleEntry2.jsp
and SaleEntry3.jsp for alternatives.
Taken from Core Web Programming Java 2 Edition
from Prentice Hall and Sun Microsystems Press,
.
May be freely used or adapted.
-->
<HTML>
<HEAD>
<TITLE>Using jsp:setProperty</TITLE>
<LINK REL=STYLESHEET
HREF="JSP-Styles.css"
TYPE="text/css">
</HEAD>
<BODY>
<TABLE BORDER=5 ALIGN="CENTER">
<TR><TH CLASS="TITLE">
Using jsp:setProperty</TABLE>
<jsp:useBean id="entry" class="cwp.SaleEntry" />
<jsp:setProperty
name="entry"
property="itemID"
value='<%= request.getParameter("itemID") %>' />
<%
int numItemsOrdered = 1;
try {
numItemsOrdered =
Integer.parseInt(request.getParameter("numItems"));
} catch(NumberFormatException nfe) {}
%>
<jsp:setProperty
name="entry"
property="numItems"
value="<%= numItemsOrdered %>" />
<%
double discountCode = 1.0;
try {
String discountString =
request.getParameter("discountCode");
// Double.parseDouble not available in JDK 1.1.
discountCode =
Double.valueOf(discountString).doubleValue();
} catch(NumberFormatException nfe) {}
%>
<jsp:setProperty
name="entry"
property="discountCode"
value="<%= discountCode %>" />
<BR>
<TABLE ALIGN="CENTER" BORDER=1>
<TR CLASS="COLORED">
<TH>Item ID<TH>Unit Price<TH>Number Ordered<TH>Total Price
<TR ALIGN="RIGHT">
<TD><jsp:getProperty name="entry" property="itemID" />
<TD>$<jsp:getProperty name="entry" property="itemCost" />
<TD><jsp:getProperty name="entry" property="numItems" />
<TD>$<jsp:getProperty name="entry" property="totalCost" />
</TABLE>
</BODY>
</HTML>
SaleEntry.Java //sale entry bean
package cwp;
/** Simple bean to illustrate the various forms
* of jsp:setProperty.
* <P>
* Taken from Core Web Programming Java 2 Edition
* from Prentice Hall and Sun Microsystems Press,
* .
* May be freely used or adapted.
*/
public class SaleEntry {
private String itemID = "unknown";
private double discountCode = 1.0;
private int numItems = 0;
public String getItemID() {
return(itemID);
}
public void setItemID(String itemID) {
if (itemID != null) {
this.itemID = itemID;
} else {
this.itemID = "unknown";
}
}
public double getDiscountCode() {
return(discountCode);
}
public void setDiscountCode(double discountCode) {
this.discountCode = discountCode;
}
public int getNumItems() {
return(numItems);
}
public void setNumItems(int numItems) {
this.numItems = numItems;
}
// In real life, replace this with database lookup.
public double getItemCost() {
double cost;
if (itemID.equals("a1234")) {
cost = 12.99*getDiscountCode();
} else {
cost = -9999;
}
return(roundToPennies(cost));
}
private double roundToPennies(double cost) {
return(Math.floor(cost*100)/100.0);
}
public double getTotalCost() {
return(getItemCost() * getNumItems());
}
}
