JavaBean 进行数据验证(1)

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 =

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