通过扫描包路径获取包内class

public static Set<Class<?>> getClasses(ClassLoader classLoader, String pack) {
        Set<Class<?>> classes = new LinkedHashSet<Class<?>>();
        boolean recursive = true;
        String packageName = pack;
        // 包路径分隔符 . 换为 /
        String packageDirName = packageName.replace(‘.‘, ‘/‘);
        try {
            Enumeration<URL> dirs;
            if (classLoader == null) {
                dirs = Thread.currentThread().getContextClassLoader()
                        .getResources(packageDirName);
            } else {
                dirs = classLoader.getResources(packageDirName);
            }
            while (dirs.hasMoreElements()) {
                URL url = (URL) dirs.nextElement();
                String protocol = url.getProtocol();
                if ("file".equals(protocol)) {
                    String filePath = URLDecoder.decode(url.getFile(), "UTF-8");
                    findAndAddClassesInPackageByFile(packageName, filePath,recursive, classes);
                } else if ("jar".equals(protocol)) {
                    try {
                        JarFile jar = ((JarURLConnection) url.openConnection())
                                .getJarFile();
                        Enumeration<JarEntry> entries = jar.entries();
                        while (entries.hasMoreElements()) {
                            JarEntry entry = (JarEntry) entries.nextElement();
                            String name = entry.getName();
                            if (name.charAt(0) == ‘/‘) {
                                name = name.substring(1);
                            }
                            if (name.startsWith(packageDirName)) {
                                int idx = name.lastIndexOf("/");
                                if (idx != -1) {
                                    packageName = name.substring(0, idx).replace(‘/‘, ‘.‘);
                                }
                                if (((idx != -1) || (recursive)) && (name.endsWith(".class")) && (!entry.isDirectory())) {
                                    String className = name.substring(packageName.length() + 1,name.length() - 6);
                                    try {
                                        classes.add(Thread.currentThread().getContextClassLoader().loadClass(
                                                        packageName + "." + className));
                                    } catch (Exception ex) {
                                        log.error(ex.getMessage(), ex);
                                    }
                                }
                            }
                        }
                    } catch (Exception ex) {
                        log.error(ex.getMessage(), ex);
                    }
                }
            }
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }
        return classes;
    }

public static void findAndAddClassesInPackageByFile(String packageName,
            String packagePath, final boolean recursive, Set<Class<?>> classes) {
        File dir = new File(packagePath);
        if ((!dir.exists()) || (!dir.isDirectory())) {
            return;
        }
        File[] dirFiles = dir.listFiles(new FileFilter() {
            public boolean accept(File file) {
                return (recursive && (file.isDirectory())) || (file.getName().endsWith(".class"));
            }
        });
        for (File file : dirFiles) {
            if (file.isDirectory()) {
                findAndAddClassesInPackageByFile(packageName + "." + file.getName(),file.getAbsolutePath(), recursive, classes);
            } else {
                String className = file.getName().substring(0,file.getName().length() - 6);
                try {
                    classes.add(Thread.currentThread().getContextClassLoader().loadClass(packageName + "." + className));
                } catch (Exception ex) {
                    log.error(ex.getMessage(), ex);
                }
            }
        }
    }