String pack = "com.test";
        pack ="/"+pack.replace(".", "/");
        String packPath = System.getProperty("user.dir")+ "/src"+ pack;

------解决方案--------------------

参考代码，jar 的部分没处理好，你自己完善一下吧。

Java code
import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Enumeration;
import java.util.jar.JarEntry;

public class Main {

    public static void main(String[] args) throws IOException, URISyntaxException, ClassNotFoundException {
        ClassLoader classloader = Thread.currentThread().getContextClassLoader();
        String baseName = baseName(classloader);
        Enumeration<URL> em = classloader.getResources("com/test");
        while(em.hasMoreElements()) {
            URL url = em.nextElement();
            
            // jar 包中的
            URLConnection connection = url.openConnection();
            if("jar".equals(url.getProtocol()) && connection instanceof JarURLConnection) {
                JarURLConnection jar = (JarURLConnection)connection;
                JarEntry entry = jar.getJarEntry();
                System.out.println(entry);
                for(Enumeration<JarEntry> e = jar.getJarFile().entries(); e.hasMoreElements(); ) {
                    System.out.println(e.nextElement());
                }
                continue;
            }
            
            // 源代码中的
            File file = new File(url.toURI());
            File[] files = file.listFiles();
            for(File f : files) {
                scan(f, baseName, classloader);
            }
        }
    }

    private static String baseName(ClassLoader classloader) throws URISyntaxException {
        return new File(classloader.getResource("").toURI()).getAbsolutePath();
    }

    private static void scan(File dir, String baseName, ClassLoader classloader) throws ClassNotFoundException {
        if(dir.isDirectory()) {
            File[] files = dir.listFiles();
            for(File file : files) {
                scan(file, baseName, classloader);
            }
            return;
        }
        scan2(dir, baseName, classloader);
    }

    private static void scan2(File dir, String baseName, ClassLoader classloader) throws ClassNotFoundException {
        String className = dir.getAbsolutePath().substring(baseName.length() + 1);
        int dot = className.indexOf('.');
        if(dot > -1) {
            className = className.substring(0, dot);
        }
        if(className.indexOf('\\') > -1) {
            className = className.replace('\\', '.');
        }
        if(className.indexOf('/') > -1) {
            className = className.replace('/', '.');
        }
        Class<?> clazz = classloader.loadClass(className);
        System.out.println(clazz.getName());
    }

    protected static String determineRootDir(String location) {
        int prefixEnd = location.indexOf(":") + 1;