rmi入门

1、定义远程接口

import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Upper extends Remote{
	public String toUpper(String str) throws RemoteException;
}

2、实现远程接口

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

public class UpperImpl extends UnicastRemoteObject implements Upper{

	public UpperImpl() throws RemoteException{ super(); };

	public String toUpper(String str) throws RemoteException{
		return str.toUpperCase();
        }

	public static void main(String[] args){
	    System.setSecurityManager(new RMISecurityManager());
	    try{
		Upper up=new UpperImpl();
		Naming.rebind("rmi://127.0.0.1:1099/UpperServer",up);
	    }
	    catch(Exception e){
		e.printStackTrace();		
 	    }	

	}

}

3、编写客户端

import java.rmi.*;
import java.net.*;

public class UpperApp{
	public static void main(String a[]){
	String res=null;
	//System.setSecurityManager(new RMISecurityManager());
		try{
			Upper up=(Upper)Naming.lookup("rmi://127.0.0.1/UpperServer");
			res=up.toUpper("fuck you !");
	
		}catch(Exception e){
			e.printStackTrace();		
		}
	System.out.println(res);
	}
}

4、编写权限文件
RMIpolicy.policy
grant
{
       permission java.security.AllPermission;
};

5、生成Sub类和Skeleton类（jdk1.5后默认只生成sub）、编译相关程序
生成Sub类和Skeleton类：rmic UpperImpl

6、运行程序
(1) 启动RMI服务器：
        start rmiregistry
 
(2)启动服务器端程序
         start java -Djava.security.policy=RMIpolicy.policy host/UpperImpl

(3)运行客户机端程序：
     java UpperApp