Mega Code Archive
JSTL Form Error Check and Forward
<![CDATA[
package beans;
public class Bid {
/** Holds value of property price. */
private long price;
/** Holds value of property item. */
private String item;
/** Creates a new instance of Bid */
public Bid() {
}
/** Getter for property price.
* @return Value of property price.
*
*/
public long getPrice() {
return this.price;
}
/** Setter for property price.
* @param price New value of property price.
*
*/
public void setPrice(long price) {
this.price = price;
}
/** Getter for property item.
* @return Value of property item.
*
*/
public String getItem() {
return this.item;
}
/** Setter for property item.
* @param item New value of property item.
*
*/
public void setItem(String item) {
this.item = item;
}
}
package beans;
public class Bidder {
/** Holds value of property item. */
private String item;
/** Holds value of property price. */
private long price;
/** Holds value of property result. */
private String result;
/** Creates a new instance of Bidder */
public Bidder() {
}
/** Getter for property item.
* @return Value of property item.
*
*/
public String getItem() {
return this.item;
}
/** Setter for property item.
* @param item New value of property item.
*
*/
public void setItem(String item) {
this.item = item;
}
/** Getter for property price.
* @return Value of property price.
*
*/
public long getPrice() {
return this.price;
}
/** Setter for property price.
* @param price New value of property price.
*
*/
public void setPrice(long price) {
this.price = price;
}
/** Getter for property result.
* @return Value of property result.
*
*/
public String getResult() {
/* simulate bid result */
this.result = "Sorry your bid did not win. The successful bidder was joe1233.";
return this.result;
}
}
package beans;
public class BidError {
/** Holds value of property msg. */
private String msg;
/** Creates a new instance of BidError */
public BidError() {
}
/** Getter for property msg.
* @return Value of property msg.
*
*/
public String getMsg() {
return this.msg;
}
/** Setter for property msg.
* @param msg New value of property msg.
*
*/
public void setMsg(String msg) {
this.msg = msg;
}
}
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<html>
<head>
<title>Enter Your Bid</title></head>
<body>
<table class="mainBox" width="400">
<tr><td class="boxTitle" colspan="2">
Wrox JSP Auction
</td></tr>
<c:if test="${!(empty biderror)}">
<tr>
<td class="errorText" colspan="2">
${biderror.msg}
</td>
</tr>
</c:if>
<tr><td colspan="2"> </td></tr>
<tr><td>
<form action="action.jsp" method="get">
<table>
<tr>
<td width="200">Item to bid on</td><td>
<select name="item">
<option>27 inch TV</option>
<option>DVD Player</option>
<option>Digital Camera</option>
</select>
<input type="hidden" name="action" value="bid"/>
</td></tr>
<tr>
<td>Bid Price:</td>
<td><input name="price" type="text" width="10"/>
</td></tr>
<tr><td colspan="2"> </td></tr>
<tr><td colspan="2" align="center">
<input type="submit" value="Bid now!"/>
</td></tr>
</table>
</form>
</td></tr></table>
</body>
</html>
<html>
<head>
<title>Show the Bid</title></head>
<body>
<table class="mainBox" width="600">
<tr><td class="boxTitle" colspan="2">
Your Auction Bid
</td></tr>
<tr><td colspan="2"> </td></tr>
<tr><td class="tableLabel" width="30%">
Item bid for
</td>
<td class="tableCell">
<c:out value="${bidinfo.item}"></td>
</tr>
<tr><td class="tableLabel">
Bid price
</td>
<td class="tableCell">
<c:out value="${bidinfo.price}"/></td>
</tr>
<tr><td class="tableLabel">
Bid result
</td>
<td class="resultCell">
<c:out value="${bidresult}"/></td>
</tr>
</table>
</body>
</html>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<c:choose>
<c:when test="${empty param.action}">
<jsp:forward page="enterbid.jsp"/>
</c:when>
<c:when test="${param.action eq 'bid'}">
<!-- validation code -->
<c:if test="${(param.price <= 0) || (param.price >= 999)}">
<jsp:useBean id="biderror" class="beans.BidError" scope="request">
<jsp:setProperty name="biderror" property="msg" value="Sorry, your bid is not in range. Please enter again."/>
</jsp:useBean>
<jsp:forward page="index.jsp"/>
</c:if>
<!-- data validated -->
<jsp:useBean id="bidinfo" class="beans.Bid" scope="request">
<jsp:setProperty name="bidinfo" property="*"/>
</jsp:useBean>
<!-- perform bidding -->
<jsp:useBean id="bidder" class="beans.Bidder" scope="request">
<jsp:setProperty name="bidder" property="item"/>
<jsp:setProperty name="bidder" property="price"/>
</jsp:useBean>
<c:set var="bidresult" value="${bidder.result}" scope="request"/>
<jsp:forward page="showbid.jsp"/>
</c:when>
</c:choose>
]]>