标签：
RMI
（Remote Method Invocation，远程方法调用）
支持存储于不同地址空间的程序级对象之间彼此进行通信，实现远程对象之间的无缝远程调用。其威力就体现在它强大的开发分布式网络应用的能力上。
一个正常工作的RMI系统由下面几个部分组成：
·远程服务的接口定义
·远程服务接口的具体实现
·桩（Stub）和框架（Skeleton）文件
·一个运行远程服务的服务器
·一个RMI命名服务，它允许客户端去发现这个远程服务
·类文件的提供者（一个HTTP或者FTP服务器）
·一个需要这个远程服务的客户端程序
API包
java.rmi.Naming
java.rmi.activation
java.rmi.dgc
java.rmi.registry
java.rmi.server
示例程序
远程服务的接口定义
package com.joyen.learning.javase.rmi; import java.rmi.Remote; public interface Calculator extends Remote { public long add(long a, long b) throws java.rmi.RemoteException; public long sub(long a, long b) throws java.rmi.RemoteException; public long mul(long a, long b) throws java.rmi.RemoteException; public long div(long a, long b) throws java.rmi.RemoteException; }
远程服务接口的具体实现
1 package com.joyen.learning.javase.rmi; 2 3 import java.rmi.RemoteException; 4 import java.rmi.server.UnicastRemoteObject; 5 6 public class CalculatorImpl extends UnicastRemoteObject implements Calculator { 7 8 9 protected CalculatorImpl() throws RemoteException { 10 super(); 11 } 12 13 @Override 14 public long add(long a, long b) throws RemoteException { 15 return a + b; 16 } 17 18 @Override 19 public long sub(long a, long b) throws RemoteException { 20 return a - b; 21 } 22 23 @Override 24 public long mul(long a, long b) throws RemoteException { 25 return a * b; 26 } 27 28 @Override 29 public long div(long a, long b) throws RemoteException { 30 return a / b; 31 } 32 33 }
一个RMI命名服务，它允许客户端去发现这个远程服务
1 package com.joyen.learning.javase.rmi; 2 3 import java.rmi.Naming; 4 import java.rmi.registry.LocateRegistry; 5 6 public class CalculatorServer { 7 8 public CalculatorServer() { 9 try { 10 Calculator c = new CalculatorImpl(); 11 LocateRegistry.createRegistry(1099); 12 Naming.bind("rmi://localhost:1099/CalculatorService", c); 13 System.out.println("INFO:远程Calculator对象绑定成功！"); 14 } catch (Exception e) { 15 System.out.println("Trouble: " + e); 16 } 17 } 18 19 public static void main(String args[]) { 20 new CalculatorServer(); 21 } 22 }
一个需要这个远程服务的客户端程序
1 package com.joyen.learning.javase.rmi; 2 3 import java.net.MalformedURLException; 4 import java.rmi.Naming; 5 import java.rmi.NotBoundException; 6 import java.rmi.RemoteException; 7 8 public class CalculatorClient { 9 10 public static void main(String[] args) { 11 try { 12 Calculator c = (Calculator) Naming 13 .lookup("rmi://localhost:1099/CalculatorService"); 14 System.out.println(c.sub(4, 3)); 15 System.out.println(c.add(4, 5)); 16 System.out.println(c.mul(3, 6)); 17 System.out.println(c.div(9, 3)); 18 } catch (MalformedURLException murle) { 19 System.out.println(); 20 System.out.println("MalformedURLException"); 21 System.out.println(murle); 22 } catch (RemoteException re) { 23 System.out.println(); 24 System.out.println("RemoteException"); 25 System.out.println(re); 26 } catch (NotBoundException nbe) { 27 System.out.println(); 28 System.out.println("NotBoundException"); 29 System.out.println(nbe); 30 } catch (java.lang.ArithmeticException ae) { 31 System.out.println(); 32 System.out.println("java.lang.ArithmeticException"); 33 System.out.println(ae); 34 } 35 } 36 }
参考：
http://www.blogjava.net/zhenyu33154/articles/320245.html
http://gongjiayun.iteye.com/blog/906159
http://blog.csdn.net/wangxingbao4227/article/details/6842951
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原文地址：http://www.cnblogs.com/mingluosunshan/p/5391706.html
