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Groups > comp.lang.java.programmer > #29946

Re: Finding other classes in .jar from running program?

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On 9/11/2014 18:39, Arne Vajhøj wrote:
> On 9/11/2014 9:28 PM, Arne Vajhøj wrote:
>> On 9/11/2014 9:15 PM, Knute Johnson wrote:
>>> Is there a way given a program running from a .jar file to find the
>>> other classes in the .jar file?
>>
>> You can ask where a given class is loaded from and if it is a jar
>> file then you can list the content of the jar file.
>
> Something like:
>
> import java.io.IOException;
> import java.util.Enumeration;
> import java.util.jar.JarEntry;
> import java.util.jar.JarFile;
>
> public class Available {
>      private static String getLocation(Class<?> clz) {
>          return
> clz.getProtectionDomain().getCodeSource().getLocation().getPath();
>      }
>      public static void main(String[] args) throws IOException {
>          String jarnam = getLocation(Available.class);
>          System.out.println(jarnam);
>          JarFile jarf = new JarFile(jarnam);
>          Enumeration<JarEntry> e = jarf.entries();
>          while(e.hasMoreElements()) {
>              JarEntry je = e.nextElement();
>              String clznam = je.getName().replace('/', '.');
>              if(clznam.endsWith(".class")) {
>                  System.out.println(clznam);
>              }
>          }
>          jarf.close();
>      }
> }
>
> Arne
>
>

Thanks Arne, that's exactly what I was looking for.  I did have a little 
hiccup with the getLocation().getPath(), I'm using Windows and there is 
a space character in my path.  Apparently getPath() returns a URL 
encoded string but the URLDecoder fixed it right up.

Thanks very much,

knute...

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Thread

Finding other classes in .jar from running program? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2014-09-11 18:15 -0700
  Re: Finding other classes in .jar from running program? Arne Vajhøj <arne@vajhoej.dk> - 2014-09-11 21:28 -0400
    Re: Finding other classes in .jar from running program? Arne Vajhøj <arne@vajhoej.dk> - 2014-09-11 21:39 -0400
      Re: Finding other classes in .jar from running program? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2014-09-11 20:51 -0700
      Re: Finding other classes in .jar from running program? Jan Burse <janburse@fastmail.fm> - 2014-09-14 01:48 +0200

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