jwhich.java

一个用java写的地震分析软件(无源码)-used to write a seismic analysis software (without source)

package org.trinet.util;

/**
 * <code>JWhich</code> is a utility that takes a Java class name
 * and displays the absolute pathname of the class file that would
 * be loaded first by the class loader, as prescribed by the
 * class path.
 * <p>
 * Usage is similar to the UNIX <code>which</code> command.
 * <p>
 * Example uses:
 * <p>
 * <blockquote>
 *      To find the absolute pathname of <code>MyClass.class</code>
 *      not in a package:
 *      <pre>java JWhich MyClass</pre>
 *
 *      To find the absolute pathname of <code>MyClass.class</code>
 *      in the <code>my.package</code> package:
 *      <pre>java JWhich my.package.MyClass</pre>
 * </blockquote>
 *
 * @author <a href="mailto:[e-mail]">Mike Clark</a>
 * @author <a href="http://www.clarkware.com">Clarkware Consulting</a>
 *
 * From: http://www.javaworld.com/javaworld/javatips/jw-javatip105.html
 */

public class JWhich {

	/**
	 * Prints the absolute pathname of the class file
	 * containing the specified class name, as prescribed
	 * by the current classpath.
	 *
	 * @param className Name of the class.
	 */
	public static void which(String className) {

		if (!className.startsWith("/")) {
			className = "/" + className;
		}
		className = className.replace('.', '/');
		className = className + ".class";

		java.net.URL classUrl =
			new JWhich().getClass().getResource(className);

		if (classUrl != null) {
			System.out.println("\nClass '" + className +
			"' found in \n'" + classUrl.getFile() + "'");
		} else {
			System.out.println("\nClass '" + className +
			"' not found in \n'" +
			System.getProperty("java.class.path") + "'");
		}
	}

	public static void main(String args[]) {
		if (args.length > 0) {
			JWhich.which(args[0]);
		} else {
			System.err.println("Usage: java JWhich <classname>");
		}
	}
}