Java RMI初探

1、    rmi接口声明

package casia.isiteam.plgroup.index.rmi;import java.rmi.Remote;import java.rmi.RemoteException;public interface Hello extends Remote {String sayHello() throws RemoteException;} 

2、    Server端

package casia.isiteam.plgroup.index.rmi;import java.rmi.AlreadyBoundException;import java.rmi.RemoteException;import java.rmi.registry.LocateRegistry;import java.rmi.registry.Registry;import java.rmi.server.UnicastRemoteObject;public class Server implements Hello {@Overridepublic String sayHello() {return "Server say hello";}public static void main(String[] args) {Server obj=new Server();try {Hello stub=(Hello)UnicastRemoteObject.exportObject(obj,0);Registry registry=LocateRegistry.getRegistry();registry.bind("hello", stub);System.out.println("Server ready");} catch (RemoteException e) {e.printStackTrace();} catch (AlreadyBoundException e) {e.printStackTrace();}}} 

3、    Client端

package casia.isiteam.plgroup.index.rmi;import java.rmi.NotBoundException;import java.rmi.RemoteException;import java.rmi.registry.LocateRegistry;import java.rmi.registry.Registry;public class Client {public static void main(String[] args) {String host = args.length < 1 ? null : args[0];try {Registry registry = LocateRegistry.getRegistry(host);Hello stub = (Hello) registry.lookup("hello");String response = stub.sayHello();System.out.println("response: " + response);} catch (RemoteException e) {e.printStackTrace();} catch (NotBoundException e) {e.printStackTrace();}}} 

4、    Unbind解除绑定
如果直接停掉程序，rmi并不会解除对stub的绑定，当再次启动server的时候会出现AlreadyBoundException

package casia.isiteam.plgroup.index.rmi;import java.rmi.NotBoundException;import java.rmi.RemoteException;import java.rmi.registry.LocateRegistry;import java.rmi.registry.Registry;public class Unbound {/*** @param args*/public static void main(String[] args) {Registry registry;try {registry = LocateRegistry.getRegistry();registry.unbind("hello");} catch (RemoteException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (NotBoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}} 

5、    启动rmi registry
进入jdk/bin目录执行start rmiregistry
6、    Eclipse中启动server端需要配置的地方：在Server的运行参数中设置java.rmi.server.codebase为-Djava.rmi.server.codebase=file:${workspace_loc}/Index/bin/

7、    在命令行执行，classpath及java.rmi.server.codebase的设置方法及运行参数(Windows环境)如下:
D:/>java -cp D:/workspace/Index/bin -Djava.rmi.server.codebase=file:D:/workspace
/Index/bin/ casia.isiteam.plgroup.index.rmi.Server

8、    此程序为官方《Getting Started Using JavaTM RMI》一文的实现，地址如下：
http://download.oracle.com/javase/6/docs/technotes/guides/rmi/hello/hello-world.html