RMI小实验

import java.rmi.Naming;
import java.rmi.RMISecurityManager;

public class DisplayPerfectTime {
public static void main(String[] args) throws Exception {
System.setSecurityManager(new RMISecurityManager());
PerfectTimeI t = (PerfectTimeI) Naming.lookup("/PerfectTime");
for (int i = 0; i < 10; i++)
System.out.println("Perfect time = " + t.getPerfectTime());
}
}



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

public class PerfectTime extends UnicastRemoteObject implements PerfectTimeI {
public PerfectTime() throws RemoteException {
super(); // Called automatically
}

public long getPerfectTime() throws RemoteException {
return System.currentTimeMillis();
}

public static void main(String[] args) throws Exception {
PerfectTime pt = new PerfectTime();
Naming.rebind("/PerfectTime", pt);
System.out.println("Ready to do time");
}
}


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


public interface PerfectTimeI extends Remote{
long getPerfectTime() throws RemoteException;
}

register.policy
grant{permission java.security.AllPermission;};

运行步骤
F:\rmi>javac *.java
　　F:\rmi>rmic PerfectTime
　　F:\rmi>start rmiregistry
　　F:\rmi>java PerfectTime
　　Ready to do time
　　另开一DOS窗口
　　F:\rmi>java -Djava.security.policy=registerit.policy DisplayPerfectTime
　　Perfect time = 1011585443953
　　Perfect time = 1011585443968
　　Perfect time = 1011585444000
　　Perfect time = 1011585444000
　　Perfect time = 1011585444015
　　Perfect time = 1011585444031
　　Perfect time = 1011585444031
　　Perfect time = 1011585444046
　　Perfect time = 1011585444062
　　Perfect time = 1011585444062
　　注意：如果在rmic PerfectTime时报找不到PerfectTime类，请在环境变量中的ClassPath中加入：F:\rmi