Java如何获取接口所有的实现类

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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

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 getAllIPeopleImpl(){     Reflections reflection=new Reflections("com.example.myapplication.people");     Map map=new HashMap<>();     Set> 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 Testing documentation  */ public class ExampleUnitTest {      @Test   public void test() {     Map 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();     }   } }