Java/Class/Classpath

Get classpath using System class

   <source lang="java">

public class Main {

 public static void main(String[] args) {
   System.out.println(System.getProperty("java.class.path"));
 }

}

 </source>
   
  
 
  

Returns a reference to a file with the specified name that is located somewhere on the classpath.

   <source lang="java">

/*

* JCommon : a free general purpose class library for the Java(tm) platform
* 
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
* 
* Project Info:  http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it 
* under the terms of the GNU Lesser General Public License as published by 
* the Free Software Foundation; either version 2.1 of the License, or 
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but 
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
* USA.  
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
* in the United States and other countries.]
* 
* ------------------
* FileUtilities.java
* ------------------
* (C) Copyright 2000-2004, by Object Refinery Limited.
*
* Original Author:  David Gilbert (for Object Refinery Limited);
* Contributor(s):   -;
*
* $Id: FileUtilities.java,v 1.5 2005/10/18 13:16:02 mungady Exp $
*
* Changes (from 5-Nov-2001)
* -------------------------
* 05-Nov-2001 : Changed package to com.jrefinery.io.* (DG);
* 04-Mar-2002 : Renamed Files.java --> FileUtilities.java (DG);
* 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
*
*/

import java.io.File; import java.util.StringTokenizer; /**

* A class containing useful utility methods relating to files.
* 
* @author David Gilbert
*/

public class FileUtilities {

 /**
  * Returns a reference to a file with the specified name that is located
  * somewhere on the classpath. The code for this method is an adaptation of
  * code supplied by Dave Postill.
  * 
  * @param name
  *          the filename.
  * 
  * @return a reference to a file or null if no file could be
  *         found.
  */
 public static File findFileOnClassPath(final String name) {
   final String classpath = System.getProperty("java.class.path");
   final String pathSeparator = System.getProperty("path.separator");
   final StringTokenizer tokenizer = new StringTokenizer(classpath, pathSeparator);
   while (tokenizer.hasMoreTokens()) {
     final String pathElement = tokenizer.nextToken();
     final File directoryOrJar = new File(pathElement);
     final File absoluteDirectoryOrJar = directoryOrJar.getAbsoluteFile();
     if (absoluteDirectoryOrJar.isFile()) {
       final File target = new File(absoluteDirectoryOrJar.getParent(), name);
       if (target.exists()) {
         return target;
       }
     } else {
       final File target = new File(directoryOrJar, name);
       if (target.exists()) {
         return target;
       }
     }
   }
   return null;
 }

}

 </source>