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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 ClassUtils {
//给一个接口，返回这个接口的所有实现类
public static List<Class> getAllClassByInterface(Class c) {
List<Class> returnClassList = new ArrayList<Class>(); //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<Class> 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 < allClass.size(); i++) {
if (c.isAssignableFrom(allClass.get(i))) { //判断是不是一个接口
if (!c.equals(allClass.get(i))) { //本身不加进去
returnClassList.add(allClass.get(i));
}
}
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return returnClassList;
}
//从一个包中查找出所有的类，在jar包中不能查找
private static List<Class> getClasses(String packageName)
throws ClassNotFoundException, IOException {
ClassLoader classLoader = Thread.currentThread()
.getContextClassLoader();
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;
}
private 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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