Below shows you how to check the html button request value using JSP:
JSP file:
<html>
<head>
<title>E-bookshop</title>
<style type="text/css">
body {background-color:gray; font-size=10pt;}
H1 {font-size:20pt;}
table {background-color:white;}
</style>
</head>
<body>
<H1>Your online Bookshop</H1>
<hr/><p/>
<form name="addForm" method="POST">
<input type="hidden" name="do_this" value="add">
Book:
<select name=book>
<option>Learn HTML5 and JavaScript for iOS. Scott Preston $39.99</option>
<option>Java 7 for Absolute Beginners. Jay Bryant $39.99</option>
</select>
Quantity: <input type="text" name="qty" size="3" value="1">
<input type="submit" value="Add to Cart">
</form>
<p/>
<form name="checkoutForm" method="POST">
<input type="hidden" name="do_this" value="checkout">
<input type="submit" value="Checkout">
</form>
<br/>
<%=request.getParameter("do_this") %>
</body>
</html>
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