Java Class from Package getClasses(String packageName)

Description

get Classes

License

Apache License

Declaration

public static List<Class> getClasses(String packageName) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

public class Main {

    public static List<Class> getClasses(String packageName) {
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        String path = packageName.replace(".", "/");
        Enumeration<URL> resources = null;
        try {/*from  w  w w  .j  a  v a2  s . c o m*/
            resources = classLoader.getResources(path);
        } catch (IOException e) {
            e.printStackTrace();
        }
        List<File> dirs = new ArrayList<>();
        if (resources != null) {
            while (resources.hasMoreElements()) {
                URL resource = resources.nextElement();
                dirs.add(new File(resource.getFile()));
            }
        }
        ArrayList<Class> classes = new ArrayList<>();
        for (File directory : dirs) {
            classes.addAll(findClass(directory, packageName));
        }
        return classes;
    }

    private static List<Class> findClass(File directory, String packageName) {
        List<Class> classes = new ArrayList<>();
        if (!directory.exists()) {
            return classes;
        }
        File[] files = directory.listFiles();
        if (files != null) {
            for (File file : files) {
                if (!file.isDirectory()) {
                    assert !file.getName().contains(".");
                    classes.addAll(findClass(file, packageName + "." + file.getName()));
                } else if (file.getName().endsWith(".class")) {
                    try {
                        classes.add(Class.forName(
                                packageName + "." + file.getName().substring(0, file.getName().length() - 6)));
                    } catch (ClassNotFoundException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        return classes;
    }
}

Related

1. getClasses(String packageName)
2. getClasses(String packageName)
3. getClasses(String packageName)
4. getClasses(String packageName)
5. getClasses(String packageName)
6. getClasses(String packageName)
7. getClasses(String packageName)
8. getClasses(String packageName, Class inheritedType)