import java.io.*;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

import java.util.*;

import java.util.jar.*;

public class JarDir {

	public static void main(String args[])

	throws IOException, ClassNotFoundException {

		/*
		 * if (args.length != 1) {
		 * 
		 * System.out.println("Please   provide   a   JAR   filename");
		 * 
		 * System.exit(-1);
		 * 
		 * }
		 */
		JarFile jarFile = new JarFile(
				"D:\\cyproject\\fileOption\\WebRoot\\WEB-INF\\lib\\bsh.jar");
		Enumeration enumjar = jarFile.entries();
		while (enumjar.hasMoreElements()) {
			process(enumjar.nextElement());
		}

	}

	private static String returnTypeName(String cname) {
		String classname = cname.substring(cname.lastIndexOf("."),
				cname.length());
		return classname;
	}

	private static void process(Object obj) throws ClassNotFoundException,
			MalformedURLException {

		JarEntry entry = (JarEntry) obj;
		String name = entry.getName();
		String classname = name.replace("/", ".");
		String typename = returnTypeName(classname);
		classname = classname.substring(0, classname.lastIndexOf("."));
		File file = new File(
				"D:\\cyproject\\fileOption\\WebRoot\\WEB-INF\\lib\\bsh.jar");
		URL url = file.toURL();
		URL[] urls = { url };

		if (typename != null && typename.equals("") == false
				&& (typename.equals(".class") || (typename.equals(".CLASS")))) {

			// 实例化一个对象
			// loader.loadClass(classpath).newInstance();
			System.out.println();
			System.out.println("==================this is The " + classname
					+ "'s methods====================");

			if (classname.equals("bsh.util.BeanShellBSFEngine")) {
				ClassLoader loader = new URLClassLoader(urls);
				Class cla = loader.loadClass(classname);
				Method[] method = cla.getDeclaredMethods();
				if (method.length > 0) {
					for (int j = 0; j < method.length; j++) {
						System.out.println(method[j].toString());
					}
				}
			} else {
				ClassLoader loader = new URLClassLoader(urls);
				Class cla = loader.loadClass(classname);
				Method[] method = cla.getDeclaredMethods();
				if (method.length > 0) {
					for (int j = 0; j < method.length; j++) {
						System.out.println(method[j].toString());
					}
				}
			}
		}

		// System.out.println("The type of class is :"+typename);

		long size = entry.getSize();

		long compressedSize = entry.getCompressedSize();

		// System.out.println(classname + "\t" + size + "\t" + compressedSize);

	}

}