getting the url of a class

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Aryeh M. Friedman - 22 Nov 2007 23:56 GMT

If I have a class that is already loaded how do I figure out from what
URL it was loaded from (actually local filename is all I care about)?

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Arne Vajhøj - 23 Nov 2007 03:37 GMT

> If I have a class that is already loaded how do I figure out from what
> URL it was loaded from (actually local filename is all I care about)?

private String getPath(Class cls) {
String cn = cls.getName();
String rn = cn.replace('.', '/') + ".class";
String path =
getClass().getClassLoader().getResource(rn).getPath();
int ix = path.indexOf("!");
if(ix >= 0) {
return path.substring(0, ix);
} else {
return path;
}
}

Arne

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Owen Jacobson - 23 Nov 2007 03:43 GMT

> If I have a class that is already loaded how do I figure out from what
> URL it was loaded from (actually local filename is all I care about)?

Assuming that the class was loaded from a file at all, you can get that
information from the class's ProtectionDomain. Have a look at
<http://java.sun.com/javase/6/docs/api/java/security/ProtectionDomain.html>
particularly the getCodeSource() method.

-O

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Roedy Green - 23 Nov 2007 08:24 GMT

On Thu, 22 Nov 2007 15:56:46 -0800 (PST), "Aryeh M. Friedman"
<Aryeh.Friedman@gmail.com> wrote, quoted or indirectly quoted someone
who said :

>If I have a class that is already loaded how do I figure out from what
>URL it was loaded from (actually local filename is all I care about)?

see http://mindprod.com/jgloss/protectiondomain.html

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Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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getting the url of a class

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