JAVA获取同一路径下所有子类或接口实现类

package find;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import find.test.Intf;
import find.test.Man;
public class ClassUtil {
public static void main(String[] args) {
try {
System.out.println("接口实现类：");
for (Class<?> c : getAllAssignedClass(Intf.class)) {
System.out.println(c.getName());
}
System.out.println("子类：");
for (Class<?> c : getAllAssignedClass(Man.class)) {
System.out.println(c.getName());
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 获取同一路径下所有子类或接口实现类
*
* @param intf
* @return
* @throws IOException
* @throws ClassNotFoundException
*/
public static List<Class<?>> getAllAssignedClass(Class<?> cls) throws IOException,
ClassNotFoundException {
List<Class<?>> classes = new ArrayList<Class<?>>();
for (Class<?> c : getClasses(cls)) {
if (cls.isAssignableFrom(c) && !cls.equals(c)) {
classes.add(c);
}
}
return classes;
}
/**
* 取得当前类路径下的所有类
*
* @param cls
* @return
* @throws IOException
* @throws ClassNotFoundException
*/
public static List<Class<?>> getClasses(Class<?> cls) throws IOException,
ClassNotFoundException {
String pk = cls.getPackage().getName();
String path = pk.replace('.', '/');
ClassLoader classloader = Thread.currentThread().getContextClassLoader();
URL url = classloader.getResource(path);
return getClasses(new File(url.getFile()), pk);
}
/**
* 迭代查找类
*
* @param dir
* @param pk
* @return
* @throws ClassNotFoundException
*/
private static List<Class<?>> getClasses(File dir, String pk) throws ClassNotFoundException {
List<Class<?>> classes = new ArrayList<Class<?>>();
if (!dir.exists()) {
return classes;
}
for (File f : dir.listFiles()) {
if (f.isDirectory()) {
classes.addAll(getClasses(f, pk + "." + f.getName()));
}
String name = f.getName();
if (name.endsWith(".class")) {
classes.add(Class.forName(pk + "." + name.substring(0, name.length() - 6)));
}
}
return classes;
}
}

 运行结果如下：

　　接口实现类：

find.test.impl.IntfImpl2
find.test.IntfImpl
子类：
find.test.BadMan
find.test.impl.GoodMan
　　目录接口如下：
src
|----find
|----ClassUtil.java
|----test
|----BadMan.java
|----impl
|    |----GoodMan.java
|    |----IntfImpl2.java
|----Intf.java
|----IntfImpl.java
|----Man.java