jsp代码
- HTML code
<html><head><title>using jsp:setProperty</title></head><body><table border="1" align="center"> <tr><th class="title"> using jsp:setProperty</table><jsp:useBean id="entry" class="bean.SaleEntry"></jsp:useBean><jsp:setProperty property="itemID" name="entry" value='<%=request.getParameter("itemID") %>'/><jsp:setProperty property="numItems" name="entry" value='<%=request.getParameter("numItems") %>'/><jsp:setProperty property="discountcode" name="entry" value='<%=request.getParameter("discountcode") %>'/><br/><table border="1" align="center"> <tr class="colored"><th>Item ID</th><th>unit price</th><th>number ordered</th><th>total price</th></tr> <tr align="right"> <td><jsp:getProperty name="entry" property="itemID" /></td> <td><jsp:getProperty name="entry" property="itemCost"/></td> <td><jsp:getProperty property="numItems" name="entry"/> </td> <td><jsp:getProperty property="totalCost" name="entry"/></td> </tr></table></body></html>----------------
bean.SaleEntry的代码：
package bean;
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) {
this.itemID = itemID;
}
public double getDiscountcode() {
return discountcode;
}
public void setDiscountcode(double discountcode) {
this.discountcode = discountcode;
}
public int getNumItems() {
return numItems;
}
public void setNumItems(int numItem) {
this.numItems = numItem;
}
public double getItemCost(){
double cost = 0.0;
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());
}
}
---------------------
错误提示：
HTTP Status 500 -
--------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /SaleEntry.jsp at line 12
9: </table>
10: <jsp:useBean id="entry" class="bean.SaleEntry"></jsp:useBean>
11: <jsp:setProperty property="itemID" name="entry" value='<%=request.getParameter("itemID") %>'/>
12: <jsp:setProperty property="numItems" name="entry" value='<%=request.getParameter("numItems") %>'/>
13: <jsp:setProperty property="discountcode" name="entry" value='<%=request.getParameter("discountcode") %>'/>
14: <br/>
15: <table border="1" align="center">
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524)