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From "Andrew Hill" <andrew.david.h...@gridnode.com>
Subject RE: [OT] Re: 4th Of July Struts Challenge...
Date Wed, 16 Jul 2003 12:22:40 GMT
<snip>
Strictly speaking, JavaBeans do not contain a constructor and implement
Serializable.
</snip>

Dont they just need to make sure a noargs constructor is available?

Are they allowed to implement serializable if they want though? Be kinda
funny if they couldnt...

I wouldnt count expression evaluation languages as scripting myself. I
reckon to be a script you need to be able to script stuff (in addition to
having some kind of expression syntax): ie: do this and this and this...
whereas an expression is merely a statement of value.
Ie: a script would be "add 1 + 1 and get the result" whereas an expression
is merely "the value of 1 + 1".

I guess you've been using LISP too long to understand the difference eh? ;->

-----Original Message-----
From: Mark Galbreath [mailto:mark_galbreath@qat.com]
Sent: Wednesday, 16 July 2003 20:12
To: 'Struts Users Mailing List'
Subject: RE: [OT] Re: 4th Of July Struts Challenge...


A few comments:

1.  I got runtime errors when I declared a DynaActionForm bean of type Map;
I had to declare it of type HashMap.

2.  You may be using JSTL, but it still looks like scripting to me.....

3.  Strictly speaking, JavaBeans do not contain a constructor and implement
Serializable.

Mark

-----Original Message-----
From: Rick Reumann [mailto:r@reumann.net]
Sent: Tuesday, July 15, 2003 11:44 PM
To: Struts Users Mailing List
Subject: [OT] Re: 4th Of July Struts Challenge...


Kris... this was just awesome! Thanks. You da 'man:)

On Tue, Jul 15,'03 (11:25 AM GMT-0400), Kris wrote:

> As it turns out, some of my ideas about a "standard" property of type
> Map versus a "mapped property" were a bit off. So, if you're still
> interested, here's something I hacked together. You'll notice I used a
> session scoped form so that Struts doesn't choke when it tries to
> populate the form.
>
> struts-config.xml:
> ------------------
>
>     <form-beans>
>         <form-bean name="employeesForm"
>                    type="org.apache.struts.action.DynaActionForm">
>             <form-property name="employeesMap" type="java.util.Map"/>
>         </form-bean>
>     </form-beans>
>
>     <action-mappings>
>         <action path="/employees/edit"
>                 type="com.dotech.EditEmployeesAction"
>                 name="employeesForm"
>                 scope="session"
>                 validate="false">
>             <forward name="success" path="/editEmployees.jsp"/>
>         </action>
>         <action path="/employees/save"
>                 type="org.apache.struts.actions.ForwardAction"
>                 parameter="/viewEmployees.jsp"
>                 name="employeesForm"
>                 scope="session"
>                 validate="false"/>
>     </action-mappings>
>
>
> editEmployees.jsp:
> ------------------
>
> <%@ taglib prefix="bean"
> uri="http://jakarta.apache.org/struts/tags-bean" %><%@ taglib
> prefix="c"    uri="http://java.sun.com/jstl/core" %><%@ taglib
> prefix="html" uri="http://jakarta.apache.org/struts/tags-html" %>
>
> <%-- dynamically get a handle to the form --%>
> <bean:struts id="mapping" mapping="/employees/save"/>
> <c:set var="attribute" value="${mapping.attribute}"/>
> <c:set var="scope" value="${mapping.scope}"/>
> <c:choose>
>     <c:when test="${scope eq 'request'}">
>         <c:set var="form" value="${requestScope[attribute]}"/>
>     </c:when>
>     <c:otherwise>
>         <c:set var="form" value="${sessionScope[attribute]}"/>
>     </c:otherwise>
> </c:choose>
>
> <html>
>
>   <head><title>Edit Employees</title></head>
>
>   <body>
>     <html:form action="/employees/save">
>       <table>
>         <c:forEach var="entry" items="${form.map.employeesMap}">
>           <tr>
>             <td><c:out value="${entry.key}"/></td>
>             <td>
>               <input type="text"
>                      name="<c:out
>                      value="employeesMap(${entry.key}).name"/>"
>                      value="<c:out value="${entry.value.name}"/>">
>             </td>
>             <td>
>               <input type="text"
>                      name="<c:out
>                      value="employeesMap(${entry.key}).age"/>"
>                      value="<c:out value="${entry.value.age}"/>">
>             </td>
>           </tr>
>         </c:forEach>
>         <tr>
>           <td align="center" colspan="3"><html:submit/></td>
>         </tr>
>       </table>
>     </html:form>
>   </body>
>
> </html>
>
>
> EmployeeBean.java:
> ------------------
>
> package com.dotech;
>
> public class EmployeeBean {
>
>     private String name;
>     private String age;
>
>     public EmployeeBean(String name, String age) {
>         this.name = name;
>         this.age = age;
>     }
>
>     public String getName() { return this.name; }
>     public void setName(String name) { this.name = name; }
>
>     public String getAge() { return this.age; }
>     public void setAge(String age) { this.age = age; }
> }
>
>
> EditEmployeesAction.java:
> -------------------------
>
> package com.dotech;
>
> import java.util.*;
> import javax.servlet.http.*;
> import org.apache.commons.beanutils.*;
> import org.apache.struts.action.*;
>
> public class EditEmployeesAction extends Action {
>
>     public ActionForward execute(ActionMapping mapping,
>                                  ActionForm form,
>                                  HttpServletRequest request,
>                                  HttpServletResponse response) throws
>                                  Exception {
>         Map empMap = new HashMap();
>         empMap.put("1111", new EmployeeBean("John Doe", "33"));
>         empMap.put("2222", new EmployeeBean("Loser Boy", "22"));
>         PropertyUtils.setProperty(form, "employeesMap", empMap);
>         return mapping.findForward("success");
>     }
> }
>
>
> viewEmployees.jsp:
> ------------------
>
> <%@ taglib prefix="bean"
> uri="http://jakarta.apache.org/struts/tags-bean" %><%@ taglib
> prefix="c"    uri="http://java.sun.com/jstl/core" %>
>
> <%-- dynamically get a handle to the form --%>
> <bean:struts id="mapping" mapping="/employees/save"/>
> <c:set var="attribute" value="${mapping.attribute}"/>
> <c:set var="scope" value="${mapping.scope}"/>
> <c:choose>
>     <c:when test="${scope eq 'request'}">
>         <c:set var="form" value="${requestScope[attribute]}"/>
>     </c:when>
>     <c:otherwise>
>         <c:set var="form" value="${sessionScope[attribute]}"/>
>     </c:otherwise>
> </c:choose>
>
> <html>
>
>     <head><title>View Employees</title></head>
>
>     <body>
>         <table>
>             <c:forEach var="entry" items="${form.map.employeesMap}">
>                 <tr>
>                     <td><c:out value="${entry.key}"/></td>
>                     <td><c:out value="${entry.value.name}"/></td>
>                     <td><c:out value="${entry.value.age}"/></td>
>                 </tr>
>             </c:forEach>
>         </table>
>     </body>
>
> </html>
>
> Quoting Kris Schneider <kris@dotech.com>:
>
> > Okay, so that's way too much work ;-). I'm not sure, but I think one
> > of the issues you're running into is the difference between a
> > "standard" property of type Map and a "mapped property". The first
> > is declared like:
> >
> > public Map getEmployeesMap()
> > public void setEmployeesMap(Map m)
> >
> > The second is declared like:
> >
> > public Object getEmployeeMapped(String key)
> > public void setEmployeeMapped(String key, Object value)
> >
> > For a mapped property, you'd use a reference like
> > "employeeMapped(1111)" to get the object stored under the "1111"
> > key. I really haven't played much with either
> > of the above cases, so I may be off base...
> >
> > Quoting Rick Reumann <r@reumann.net>:
> >
> > > Ok stupid subject line, but now I can get back to something I was
> > > curious about that I posted around a week ago. I'm really curious
> > > how to do accomplish this and yes have tried it a bunch of
> > > different ways...
> > >
> > > Here's the challenge....
> > >
> > > First challenge is just with a regular ActionForm...
> > >
> > > 1) Your ActionForm has to have a property of type Map. For this
> > > adventure call it employeesMap.
> > >
> > > 2) Each map will hold for the key and employeeID ( String ssn -
> > > social security number whatever). The value will be an
> > > EmployeeBean. For testing sake just have it have two properties
> > > String name, String age.
> > >
> > > 3) Put two employees into the Map and put this Map into your
> > > ActionForm: HashMap empMap = new HashMap();
> > > empMap.put( "1111", new EmployeeBean("John Doe", "33" ) );
> > > empMap.put( "2222", new EmployeeBean("Loser Boy", "22" ) );
> > > setEmployeesMap( empMap );
> > >
> > > 4) Now have a jsp form iterate over this Map and provide text
> > > fields to edit the name and age of each employee. When the form is
> > > submitted there should be a way that it will submit this Map with
> > > updated EmployeeBeans with the new names and ages for each key
> > > (1111 and 2222 ). Pull the map out of the action you submit to and
> > > print the properties of the EmployeeBeans to test.
> > >
> > >
> > > Second challenge... is do the above using your employeesMap as a
> > > property of a DynaActionForm.
> > >
> > > Preferably use JSTL and/or struts-el also would be nice.
> > >
> > > (First one to successfully complete this challenge will win 100
> > > dollars for each person that they forward this e-mail to, as
> > > Microsoft will be monitoring all the e-mails as well. That kid
> > > doing this project for his science fair project to see how far
> > > e-mails travel will also be involved, so please reply to him. The
> > > 100 dollars will come from that African tribe leader with that
> > > money he is just dying to give away if you just contact him. Some
> > > of the money might come from the stolen tourist kidney sales in
> > > Mexico, but I'm not positive of that).
> > >
> > > --
> > > Rick
> >
> > --
> > Kris Schneider <mailto:kris@dotech.com>
> > D.O.Tech       <http://www.dotech.com/>
>


--
Rick

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