SPI技术的简单例子

Provider.java

package org.example.spi;

public interface Provider {
    void find();
}

pom.xml

    
        
            org.example
            spi-provider
            1.0-SNAPSHOT
        
    

ProviderClient.javva

package org.example.spi;

public class ProviderClient implements Provider {
    @Override
    public void find() {
        System.out.println("spi-client implements the interface of spi-provider.find");
    }
}

/meta-INF/services/org.example.spi.Provider

org.example.spi.ProviderClient

pom.xml

        
            org.example
            spi-client
            1.0-SNAPSHOT
        
    

测试函数, org.example.spi.Example

package org.example.spi;

import java.util.Iterator;
import java.util.ServiceLoader;

public class Example {
    public static void main(String[] args) {
        ServiceLoader load = ServiceLoader.load(Provider.class);
        Iterator iterator = load.iterator();
        while (iterator.hasNext()) {
            iterator.next().find();
        }
    }
}

运行结果为

Connected to the target VM, address: '127.0.0.1:56052', transport: 'socket'
spi-client implements the interface of spi-provider.find
Disconnected from the target VM, address: '127.0.0.1:56052', transport: 'socket'

Process finished with exit code 0