手动启动服务方式，参考自：https://www.cnblogs.com/fanghao/p/8918953.html

接口：

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

public interface IHello extends Remote {
    public String sayHelloToSomeBody(String someBodyName) throws RemoteException;
}

实现类：

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class HelloImpl extends UnicastRemoteObject implements IHello {
    public HelloImpl() throws RemoteException {
        super();
    }
    public String sayHelloToSomeBody(String someBodyName) throws RemoteException {
        System.out.println("Connected sucessfully!");
        return "你好，" + someBodyName + "!";
    }
}

服务端：

import java.net.MalformedURLException;
import java.rmi.AlreadyBoundException;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;

public class HelloServer {
    public static void main(String args[]) {
        try {
            IHello rhello = new HelloImpl();
            LocateRegistry.createRegistry(6666);
            Naming.bind("rmi://localhost:6666/RHello", rhello);
            System.out.println(">>>>>INFO:远程IHello对象绑定成功！");
        } catch (RemoteException e) {
            System.out.println("创建远程对象发生异常！");
            e.printStackTrace();
        } catch (AlreadyBoundException e) {
            System.out.println("发生重复绑定对象异常！");
            e.printStackTrace();
        } catch (MalformedURLException e) {
            System.out.println("发生URL畸形异常！");
            e.printStackTrace();
        }
    }
}

客户端：

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;

public class Client {
    public static void main(String args[]) {
        try {
            // 填写服务器ip
            IHello rhello = (IHello) Naming.lookup("rmi://127.0.0.1:6666/RHello");
            System.out.println(rhello.sayHelloToSomeBody("Erich"));
        } catch (NotBoundException e) {
        } catch (MalformedURLException e) {
            e.printStackTrace();
            e.printStackTrace();
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
}