用于在给定目录和子目录中查找所有类的递归方法。

//package com.nowjava;

import java.io.File;

/*来自 
 时 代 J a v a*/

import java.net.URL;

import java.util.ArrayList;


import java.util.List;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;


public class Main {

    public static void main(String[] argv) throws Exception {

        File directory = new File("Main.java");/*来 自 时代Java公众号 - N o w J a  v a . c o m*/

        String packageName = "nowjava.com";

        System.out.println(findClasses(directory, packageName));

    }


    /**

     * Recursive method used to find all classes in a given directory and subdirs.

     *

     * @param directory   The base directory

     * @param packageName The package name for classes found inside the base directory

     * @return The classes

     * @throws ClassNotFoundException

     */

    public static List<Class> findClasses(File directory, String packageName)

            throws ClassNotFoundException {

        List<Class> classes = new ArrayList<Class>();

        if (!directory.exists()) {

            return classes;

        }

        File[] files = directory.listFiles();

        for (File file : files) {

            if (file.isDirectory()) {

                assert !file.getName().contains(".");

                classes.addAll(findClasses(file,

                        packageName + "." + file.getName()));

            } else if (file.getName().endsWith(".class")) {

                classes.add(Class.forName(packageName

                        + '.'

                        + file.getName().substring(0,

                                file.getName().length() - 6)));

            }

        }

        return classes;

    }


    public static List<Class> findClasses(String path, String packageName) {

        List<Class> classes = new ArrayList<Class>();

        try {

            if (path.startsWith("file:")) {


                URL jar = new URL(path);

                ZipInputStream zip = new ZipInputStream(jar.openStream());

                ZipEntry entry;

                while ((entry = zip.getNextEntry()) != null) {

                    if (entry.getName().endsWith(".class")) {

                        String className = entry.getName()

                                .replaceAll("[$].*", "")

                                .replaceAll("[.]class", "")

                                .replace('/', '.');

                        if (className.startsWith(packageName)) {

                            classes.add(Class.forName(className));

                        }

                    }

                }

            }

            File dir = new File(path);

            if (!dir.exists()) {

                return classes;

            }

            File[] files = dir.listFiles();

            for (File file : files) {

                if (file.isDirectory()) {

                    assert !file.getName().contains(".");

                    classes.addAll(findCla