dubbo spi

源码解析见我的另一个博客

https://www.cnblogs.com/zhouyanger/p/13266654.html

1.新建接口，并用@SPI标示

package com.zy.dubbospi;

import com.alibaba.dubbo.common.extension.Adaptive;
import com.alibaba.dubbo.common.extension.SPI;

@SPI
public interface Robot {
    void sayHello();
}
2.实现类

package com.zy.dubbospi;

public class FirstRobot implements Robot{
    @Override
    public void sayHello() {
        System.out.println("firstRobt");
    }
}

package com.zy.dubbospi;

public class SecondRobot implements Robot{
    @Override
    public void sayHello() {
        System.out.println("second Robot");
    }
}
3.同样的resources下新建META-INF文件夹，再新建dubbo文件夹，然后以接口的名称新建文件，

 

 

 3.文件中以key value设置，key可以自定义，value是接口的实现类

first=com.zy.dubbospi.FirstRobot
second=com.zy.dubbospi.SecondRobot
4.测试

//测试dubbospi
ExtensionLoader<Robot> extensionLoader = ExtensionLoader.getExtensionLoader(Robot.class);
Robot first = extensionLoader.getExtension("first");
first.sayHello();
Robot second = extensionLoader.getExtension("second");
second.sayHello();