Java如何获取接口所有的实现类
作者：苍穹之跃
这篇文章主要介绍了Java如何获取接口所有的实现类，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
Java获取接口所有的实现类
最近因业务需求，要实现NodeRed服务后端化，为使各个节点的解析进行插件化（NodeRed各个节点也是插件化，安装插件即可使用） ，后端不得不动态加载解析NodeRed节点json，用一个接口来统一管理。
import cn.hutool.core.util.ClassUtil;
import java.util.*;
/**
* 此类用来解析NodeRed服务器的json串
*/
public class NodeRedParseUtil {
public static void main(String[] args) throws IllegalAccessException, InstantiationException {
//获取所有的模型实现类
Set<Class<?>> classes = ClassUtil.scanPackageBySuper("com.ciih.nodred.plugins", NodeRedModel.class);
Map<String, NodeRedModel> map = new HashMap<>(classes.size());
for (Class<?> aClass : classes) {
//实例化
Object o = aClass.newInstance();
System.out.println();
if (o instanceof NodeRedModel) {
NodeRedModel nodeRedModel = (NodeRedModel) o;
map.put(nodeRedModel.getType(), nodeRedModel);
}
}
}
}反射获取接口的所有实现类
添加依赖
implementation 'org.reflections:reflections:0.9.12'
接口
package com.example.myapplication.people;
public interface IPeople {
String say();
}实现类
package com.example.myapplication.people;
public class Student implements IPeople{
@Override
public String say() {
return "I am a student";
}
}package com.example.myapplication.people;
public class Teacher implements IPeople{
@Override
public String say() {
return "I am a teacher";
}
}工具类
package com.example.myapplication;
import android.net.IpPrefix;
import com.example.myapplication.people.IPeople;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.reflections.Reflections;
public class Utils {
public static Map<String,Class> getAllIPeopleImpl(){
Reflections reflection=new Reflections("com.example.myapplication.people");
Map<String,Class> map=new HashMap<>();
Set<Class<? extends IPeople>> set=reflection.getSubTypesOf(IPeople.class);
for(Class c:set){
map.put(c.getSimpleName(),c);
}
return map;
}
}测试类
package com.example.myapplication;
import com.example.myapplication.people.IPeople;
import java.util.Map;
import org.junit.Test;
import static org.junit.Assert.*;
/**
* Example local unit test, which will execute on the development machine (host).
*
* @see <a href="http://d.android.com/tools/testing" rel="external nofollow" >Testing documentation</a>
*/
public class ExampleUnitTest {
@Test
public void test() {
Map<String, Class> map = Utils.getAllIPeopleImpl();
try {
for (String str : map.keySet()) {
Object people = map.get(str).newInstance();
if(people instanceof IPeople){
System.out.println(str);
System.out.println(((IPeople) people).say());
}
}
} catch (IllegalAccessException | InstantiationException e) {
e.printStackTrace();
}
}
}总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。