获取某一个接口的所有实现类

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

• @author cbf4Life [email protected] I'm glad to share my knowledge with you
• all.

*/
@SuppressWarnings("all")
public class ClassUtils {

//给一个接口，返回这个接口的所有实现类
public static List getAllClassByInterface(Class c){
    List returnClassList = new ArrayList(); //返回结果

    //如果不是一个接口，则不做处理
    if(c.isInterface()){
        String packageName = c.getPackage().getName(); //获得当前的包名
        try {
            List allClass = getClasses(packageName); //获得当前包下以及子包下的所有类

            //判断是否是同一个接口
            for(int i=0;i getClasses(String packageName)
        throws ClassNotFoundException, IOException {
    ClassLoader classLoader = Thread.currentThread()
            .getContextClassLoader();
    String path = packageName.replace('.', '/');
    Enumeration resources = classLoader.getResources(path);
    List dirs = new ArrayList();
    while (resources.hasMoreElements()) {
        URL resource = resources.nextElement();
        dirs.add(new File(resource.getFile()));
    }
    ArrayList classes = new ArrayList();
    for (File directory : dirs) {
        classes.addAll(findClasses(directory, packageName));
    }
    return classes;
}


private static List findClasses(File directory, String packageName)
        throws ClassNotFoundException {
    List classes = new ArrayList();
    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;
}

}