// 远程接口
public interface Hello extends java.rmi.Remote {
    String sayHello() throws java.rmi.RemoteException;
}

// 远程对象实现
public class HelloImpl extends java.rmi.server.UnicastRemoteObject implements Hello {
    public HelloImpl() throws java.rmi.RemoteException {
        super();
    }

    public String sayHello() {
        return "Hello, world!";
    }
}

// 服务器端
public class Server {
    public static void main(String args[]) {
        try {
            HelloImpl obj = new HelloImpl();
            Naming.rebind("//localhost/HelloServer", obj);
            System.out.println("HelloServer bound in registry");
        } catch (Exception e) {
            System.out.println("HelloImpl err: " + e.getMessage());
            e.printStackTrace();
        }
    }
}

// 客户端
public class Client {
    public static void main(String args[]) {
        try {
            Hello obj = (Hello) Naming.lookup("//localhost/HelloServer");
            String message = obj.sayHello();
            System.out.println("Message from the RMI server: " + message);
        } catch (Exception e) {
            System.out.println("HelloClient exception: " + e.getMessage());
            e.printStackTrace();
        }
    }
}