import java.rmi.RemoteException;
import java.rmi.*;/*** 定义一个远程接口，必须继承Remote接口，其中需要远程调用的方法须抛出RemoteException异常*/
public interface CompareHelper<T> extends Remote {/*** 比较 object1 和 object2 的大小,* 如果object1大, 那么返回true* 如果object2大, 那么返回false*/boolean compare(T object1, T object2) throws RemoteException;/*** 将object2的值连接到object1的后面*/T append(T object1, T object2) throws RemoteException;
}

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;public class IntegerCompareHelper extends UnicastRemoteObject implements CompareHelper<Integer> {protected IntegerCompareHelper() throws RemoteException {}@Overridepublic boolean compare(Integer object1, Integer object2) throws RemoteException {return object1 - object2 > 0;}@Overridepublic Integer append(Integer object1, Integer object2) throws RemoteException {return Integer.valueOf(object1.toString() + object2.toString());}
}

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;public class StringCompareHelper extends UnicastRemoteObject implements CompareHelper<String> {protected StringCompareHelper() throws RemoteException {}@Overridepublic boolean compare(String object1, String object2) throws RemoteException {return object1.compareTo(object2) > 0;}@Overridepublic String append(String object1, String object2) throws RemoteException {return object1 + object2;}
}

import java.net.MalformedURLException;
import java.rmi.AlreadyBoundException;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;/*** 创建RMI注册表，启动RMI服务，并将远程对象注册到RMI注册表中。*/
public class Server {private static final String HOST = "localhost";private static final int PORT = 9090;public static void main(String args[]) {try {//创建2个对象, 准备将这个两个对象作为远程对象注册CompareHelper stringCompareHelper = new StringCompareHelper();CompareHelper integerCompareHelper = new IntegerCompareHelper();LocateRegistry.createRegistry(PORT);//绑定的URL标准格式为：rmi://host:port/name(其中协议名可以省略，下面两种写法都是正确的）// 本例子中就是 "rmi://localhost:9090/XXXXXXCompareHelper"Naming.bind("rmi://" + HOST + ":" + PORT + "/StringCompareHelper", stringCompareHelper);Naming.bind("//" + HOST + ":" + PORT + "/IntegerCompareHelper", integerCompareHelper);System.out.println("---->远程对象绑定成功！");} 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();}}
}

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;/*** 客户端测试，在客户端调用远程对象上的远程方法，并返回结果。*/
@SuppressWarnings("unchecked")
public class Client {public static void main(String args[]) {try {CompareHelper compareHelper;compareHelper = (CompareHelper) Naming.lookup("rmi://localhost:9090/StringCompareHelper");System.out.println(compareHelper.append("你好", "哈哈哈"));System.out.println(compareHelper.compare("abc", "ioi"));compareHelper = (CompareHelper) Naming.lookup("rmi://localhost:9090/IntegerCompareHelper");System.out.println(compareHelper.append(6379, 8080));System.out.println(compareHelper.compare(435, 666));} catch (NotBoundException | MalformedURLException | RemoteException e) {e.printStackTrace();}}
}