JSP help - Java

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Hello, I have a project using JSP and JSTL. I have to forward one JSP to another. The problem that I am having is understanding what JSTL tags to loop through and get the information from the java class by using the
<c:when>, <c:choose> tags. I have index.jsp, plants.jsp and a Customers.java file. The customer has to what type of plant they want, enter a quanity, and put in their id number. I have 2 errorr messages, one if that they need to order over a quarnity of 24 and one is not a valid id. When I get to retrieving the customer id I don't know how to use the correct tags to get the customer Id. It just keeps giving me the error message. Can someone tell me how I would write the the tags to get the customer id and list the name of the customer on the output page.

Here is my code for index.jsp

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%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

  <%@ taglib prefix="pl" uri = "/jsp/plants.tld" %>
 
<c:choose>

  <c:when test="${empty param.action}">

     <jsp:forward page="plants.jsp"/>  

  </c:when>
 
  <c:when test="${param.action eq 'purchased'}">
 
     <jsp:useBean id="mistake" class="plants.Mistake" scope="request">

        <jsp:setProperty name="mistake" property="msg" value="Sorry, you must buy at least two dozen. Please enter again."/>

     </jsp:useBean>
 
     <c:if test="${(param.number <= 24) }">        

         <jsp:forward page="plants.jsp"/> 

     </c:if> 
 
     <c:set var= "present" value = "${param.custId}" scope="application" /> 
 
    ${pl:unloadCust()}

    ${pl:loadCust()}

    ${pl:checkCust(present)}
 
    <c:if test="${!pl:checkCust(present)}"> 

        <jsp:setProperty name="mistake" property="msg" value="Sorry, invalid ID. Please enter again."/> 

         <jsp:forward page="plants.jsp"/>   

     </c:if>
 
     <jsp:useBean id="purchase" class="plants.Purchase" scope="request">

        <jsp:setProperty name="purchase" property="*"/> 

     </jsp:useBean>
 
     <jsp:forward page="showPurchase.jsp"/>     
 
</c:when>

</c:choose>

Here is my code for plants.jsp

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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>

<head>

<link rel=stylesheet type="text/css" href="sales.css">

<title>Plant Sales</title></head>

<body>

<table class="mainBox" width="386">

<tr>

<c:if test="${!(empty mistake)}">

  <tr>

    <td class="errorText" colspan="2">

       ${mistake.msg}

    </td>

  </tr>

</c:if>
 
<td width="352" colspan="2" class="boxTitle" align="center"><h1>Plant Sales</h1></td>

</tr>

<tr><td>

<form  action="index.jsp" method="get">

<table style="height: 215px; width: 405px">

<tr>

<td width="145" style="width: 177px">Plants to purchase :<td width="175">

<select name="item">

  <option>Hosta</option>

  <option>Orchid</option>

  <option>Alyssum</option>

</select>

<input type="hidden" name="action" value="purchased"/>

</td>

</tr>

<tr>

<td>Number desired:</td>
 
<td><label>

  <input type="text" name="number" id="number">

</label>

  </td></tr>

<tr>

<td>Customer Id :</td>
 
<td><label>

<c:forEach var="present" items="${param.custId}" >

<c:choose>

<c:when test="${pl:checkCust(present)}">

        </c:choose>

<c:otherwise>

        <c:if test="${!pl:checkCust(present)}">

        </c:if>

      </c:otherwise>

    </c:choose>

  </c:when>

  </c:forEach>
 
<input type="text" name="action" id="${param.custId}">

</label>

  </td></tr>
 
 <tr style="height: 51px"><td colspan="2" align="center">

<input type="submit" value="OK"/>

</td></tr>

</table>

</form>

</td></tr></table>

</body>

</html>

Here is my customers.java

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package plants;
 
import java.util.*;
 
public class Customers

{
 
    private static ArrayList cust = new ArrayList();

    // write an empty constructor

    public Customers()

    {
 
    }
 
    public static void loadCust()

    {
 
        cust.add(new Customer(123, "Donald", "Duck"));

        cust.add (new Customer(124, "Mickey", "Mouse"));

        cust.add(new Customer (125, "Minnie", "Mouse"));

    }

    public static void unloadCust()

    {
 
            cust.clear();

        // write code to clear out all the customers from the ArrayList

    }
 
    public static  boolean checkCust(int id)

    {

        boolean found = false;

        int i=0;

        // note a while loop since we want to stop once we find them

        // each one should be present only once!

        while (!found && i<cust.size())           // two ways to end - we find it or we get to the end 

        {

            Customer c = (Customer) cust.get(i);

            int Num = c.getCustId();

            if(Num==id)                        // found it!!

            {

                found = true;                         // set found to true to end the loop

                return true;   // print it out

            }

            else

                i++;                                // look at the next one

        }
 
        if (!found)                                    // check to see if it ever was found    
 
        return found;

        return false;
 
        }
 
        // write code to look for a Customer with the id parameter

        // return true or false
 
    public static  String getCust(int id)

    {

        boolean found = false;

        int i=0;

        // note a while loop since we want to stop once we find them

        // each one should be present only once!

        while (!found && i<cust.size())           // two ways to end - we find it or we get to the end 

        {

            Customer c = (Customer) cust.get(i);

            int Num = c.getCustId();

            if(Num==id)                        // found it!!

            {

                found = true ;                         // set found to true to end the loop

                c.getName() ;  // print it out

            }

            else

                i++;                                // look at the next one

        }
 
        if (!found);

        return "Nobody";

        // check to see if it ever was found    
 
        }
 
    public static String print()

    {

         return print();
 
    }
 
}

Here is my showpurchase.js p

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<html>

<head>

<link rel=stylesheet type="text/css" href="sales.css">

<title>Plant Purchased</title></head>

<body>

<table class="mainBox" width="600">

<tr><td class="boxTitle" colspan="2">

Your Order

</td></tr>

<tr><td colspan="2">&nbsp;</td></tr>

<tr><td class="tableLabel" width="30%">

  Items Purchased

</td>

<td class="tableCell">

${purchase.item}</td>

</tr>

<tr><td class="tableLabel">

Item Number

</td>

<td class="tableCell">

${purchase.number}</td>

</tr>

<tr>

  <td>Customer Id :</td>

 <td><input type="text" name="Id" id="Id"></td>

</tr>

</table>

</body>

</html>

Mar 4 '08 #1

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1816

Dököll

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Recognized Expert Top Contributor

Thanks for posting your code...

Looks like you got yourself pretty far. Perhaps a tutorial may help shed some light:Using JSTL

Not time to run your code, just passing through...

Dec 13 '08 #2

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