get Classes by package name - Java Reflection

Java examples for Reflection:package

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Description

get Classes by package name

Demo Code


//package com.java2s;
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 void main(String[] argv) throws Exception {
        String packageName = "java2s.com";
        System.out.println(getClasses(packageName));
    }/*from  w ww.j  a v a2  s. c  om*/

    @SuppressWarnings("rawtypes")
    public static ArrayList<Class> getClasses(String packageName)
            throws ClassNotFoundException, IOException {
        ClassLoader classLoader = Thread.currentThread()
                .getContextClassLoader();
        assert classLoader != null;
        String path = packageName.replace('.', '/');
        Enumeration<URL> resources = classLoader.getResources(path);
        List<File> dirs = new ArrayList<File>();
        while (resources.hasMoreElements()) {
            URL resource = resources.nextElement();
            dirs.add(new File(resource.getFile()));
        }
        ArrayList<Class> classes = new ArrayList<Class>();
        for (File directory : dirs) {
            classes.addAll(findClasses(directory, packageName));
        }
        return classes;
    }

    @SuppressWarnings("rawtypes")
    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;
    }
}

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