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Groups > comp.lang.java.programmer > #13059
| From | Chris Riesbeck <Chris.Riesbeck@gmail.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: JSTL: getting a map's keys |
| Date | 2012-03-19 16:06 -0500 |
| Message-ID | <9sple1FilsU1@mid.individual.net> (permalink) |
| References | <9spbepF1baU1@mid.individual.net> <2b4fm7t90armrhn9qjn7qi25oqssceja73@4ax.com> |
On 3/19/2012 3:08 PM, Tim Slattery wrote:
> Chris Riesbeck<Chris.Riesbeck@gmail.com> wrote:
>
>
>> <p>jstl: ${rates.keys}</p>
>
> The EL here finds the object "rates" and looks for an attribute named
> "keys". That means that if rates doesn't have a public method named
> getKeys, the EL won't find anything.
>
Which it does. Here's a complete example, class and test JSP, and the
HTML output I get
****** CLASS
package example;
import java.util.HashMap;
import java.util.Set;
public class SimTable extends HashMap<String, Object> {
public Set<String> getKeys() {
return keySet();
}
}
****** JSP
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
final example.SimTable data = new example.SimTable();
data.put("Bill", 100); data.put("Mary", 150); data.put("Fred", 200);
pageContext.setAttribute("data", data);
%>
<!doctype HTML>
<html>
<head>
<title>Test</title>
</head>
<body>
<p>data: ${data}</p>
<p>data.keys: ${data.keys}</p>
<p>data.getKeys():
<%= ((example.SimTable) pageContext.findAttribute("data")).getKeys() %>
</p>
</body>
</html>
****** HTML output
<!doctype HTML>
<html>
<head>
<title>Test</title>
</head>
<body>
<p>data: {Bill=100, Mary=150, Fred=200}</p>
<p>data.keys: </p>
<p>data.getKeys():
[Bill, Mary, Fred]
</p>
</body>
</html>
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JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-19 13:15 -0500
Re: JSTL: getting a map's keys Lew <lewbloch@gmail.com> - 2012-03-19 12:57 -0700
Re: JSTL: getting a map's keys Tim Slattery <Slattery_T@bls.gov> - 2012-03-19 16:08 -0400
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-19 16:06 -0500
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-19 16:39 -0500
Re: JSTL: getting a map's keys markspace <-@.> - 2012-03-19 15:27 -0700
Re: JSTL: getting a map's keys Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-19 16:59 -0700
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-20 12:19 -0500
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-20 12:52 -0500
Re: JSTL: getting a map's keys Lew <lewbloch@gmail.com> - 2012-03-20 11:05 -0700
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-21 13:09 -0500
Re: JSTL: getting a map's keys Lew <noone@lewscanon.com> - 2012-03-22 07:51 -0700
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-22 12:53 -0500
Re: JSTL: getting a map's keys Lew <lewbloch@gmail.com> - 2012-03-22 13:23 -0700
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-23 12:23 -0500
Re: JSTL: getting a map's keys Lew <noone@lewscanon.com> - 2012-03-23 13:50 -0700
Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-26 14:10 -0500
Re: JSTL: getting a map's keys Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-20 11:28 -0700
Re: JSTL: getting a map's keys markspace <-@.> - 2012-03-20 11:29 -0700
Re: JSTL: getting a map's keys Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-20 12:10 -0700
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