一个小demo：RMI 远程调用

接口

试了好几十遍，似乎暴露服务与引用服务调用的接口必须是同一个才行

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface RmiService extends Remote {

    String getMsg(int param1, int param2) throws RemoteException;

}

暴露服务

实现

import com.spring.boot.rmi.share.RmiService;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class RmiServiceImpl extends UnicastRemoteObject implements RmiService {

    public RmiServiceImpl() throws RemoteException {
    }

    @Override
    public String getMsg(int param1, int param2) throws RemoteException {
        return param2 + " - " + param1 + " = " + (param2 - param1);
    }

}

服务

import com.spring.boot.test.rmi.share.RmiService;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class ExposureServer {

    /**
     * 服务端端口
     */
    private static final int PORT = 12345;

    /**
     * 远程对象引用名
     */
    private static final String METHOD_NAME = "service";

    public static void main(String[] args) throws Exception {
        RmiService service = new RmiServiceImpl();
        System.out.println("暴露接口实现：" + service.getClass().getName());
        // 创建注册管理器
        Registry registry = LocateRegistry.createRegistry(PORT);
        // 把对象绑定到注册管理器上，设置访问名
        registry.rebind(METHOD_NAME, service);
    }

}

引用服务

import com.spring.boot.rmi.share.RmiService;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class ReferenceServer {

    /**
     * 暴露服务地址
     */
    private static final String HOST = "127.0.0.1";

    /**
     * 暴露服务端口
     */
    private static final int PORT = 12345;

    /**
     * 远程对象引用名
     */
    private static final String METHOD_NAME = "service";

    public static void main(String[] args) throws Exception {
        // 获取远程注册管理器
        Registry registry = LocateRegistry.getRegistry(HOST, PORT);
        // 根据引用名获取远程对象
        RmiService service = (RmiService) registry.lookup(METHOD_NAME);
        System.out.println(service.getMsg(1, 2));
    }

}