JAVA获取同一路径下所有子类或接口实现类

package zmx.util;

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

import zmx.spring.aop.test.IHelloWorldService;

public class ClassUtil {

/**
* 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;
}

public static void main(String[] args) {
try {
System.out.println("获取所有子类和实现类：");
for (Class<?> c : getAllAssignedClass(IHelloWorldService.class)) {
System.out.println(c.getName());
}
System.out.println("获取所有类：");
for (Class<?> c : getClasses(IHelloWorldService.class)) {
System.out.println(c.getName());
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

}

输出：

获取所有子类和实现类：

zmx.spring.aop.test.HelloWorldService

获取所有类：

zmx.spring.aop.test.HelloWorldAspect

zmx.spring.aop.test.HelloWorldService

zmx.spring.aop.test.IHelloWorldService

zmx.spring.aop.test.LoggerAspect

zmx.spring.aop.test.MainTest