java rmi 使用方法

server

package Server;

import java.rmi.Naming;

import java.rmi.RMISecurityManager;

import java.rmi.registry.LocateRegistry;

import Service.Calc;

import ServiceImpl.CalcImpl;

public class Server{

     // 由于这里测试我们是最终用户，所以直接将异常抛给虚拟机

     public static void main(String[] args) throws Exception

     {

          System.setSecurityManager(new RMISecurityManager()); //权限

          System.setProperty("java.rmi.server.hostname","192.168.1.119");  //指定外网IP

          LocateRegistry.createRegistry(9000);

          //System.setProperty("java.security.policy", "/home/ufo/workspace_java/RMIServer/Calc.policy");

          Calc c = new CalcImpl();

          Naming.rebind("rmi://192.168.1.119:9000/Calc", c);

          System.out.println("rmi server start ...");

     }

}

　　

service

package Service;

import java.rmi.*;

public interface Calc extends Remote {

	public int add(int x,int y) throws RemoteException;

}

　　service impl

package ServiceImpl;

import java.rmi.RemoteException;

import java.rmi.server.UnicastRemoteObject;

import Service.Calc;

public class CalcImpl extends UnicastRemoteObject implements Calc{

	/**

	 *

	 */

	private static final long serialVersionUID = 6523564220840187253L;

	public CalcImpl() throws RemoteException {

		super();

		// TODO Auto-generated constructor stub

	}

	@Override

	public int add(int x, int y) {

		// TODO Auto-generated method stub

		System.out.println("add called!");

		return x+y;

	}

}

　　

client

package client;

import java.rmi.*;

import java.net.MalformedURLException;

import Service.Calc;

public class Client

{

    // 同样为了方便，直接异常抛出

    public static void main(String[] args) throws Exception

    {

        System.setSecurityManager(new RMISecurityManager());

        try

        {

            // 这里因为是在本地所以省略了地址跟协议，若在网络中的远程方法调用，需要这样写

            // Converter c = (Converter)Naming.lookup("rmi://192.168.0.13/convert");

            Calc c = (Calc)Naming.lookup("rmi://192.168.1.119:9000/Calc");

            int rmb = c.add(10,20);

            System.out.println("add result : " + rmb);

        }

        catch (MalformedURLException e)

        {

            e.printStackTrace();

        }

        catch (RemoteException e)

        {

            e.printStackTrace();

        }

        catch (NotBoundException e)

        {

            e.printStackTrace();

        }

    }

}

　　

客户端和服务器端都需要制定 类权限文件,即启动时命令  java -Djava.security.policy=./Calc.policy   server.Server[client.Client]

Calc.policy

grant {
permission java.security.AllPermission;
};

客户端还需要有服务的接口声明