Java RMI 示例

Java RMI Demo-- Java RMI 示例
本文给出了一个Java RMI的示例,其中注册过程是使用Registry

本例子包含了共4个文件，分别是HelloClient，Hello，HelloServer，config.properti

/*Hello.java*/

package rmi.cn.riil.demo;

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

/**
*
* @author ZB
*
*/
public interface Hello extends Remote {

String sayHello() throws RemoteException;

}

/*HelloServer*/

package rmi.cn.riil.demo;

import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.util.ResourceBundle;

/**
*
* @author ZB
*
*/
public class HelloServer extends UnicastRemoteObject implements Hello {
private static final long serialVersionUID = 1L;
String name;

   public HelloServer(String s) throws RemoteException {
       super();
       name = s;
   }

   public String sayHello() throws RemoteException {
       return "Hello world!";
   }

   public static void main(String[] args) {
       /**
       * 下面这句话若要加上，则需要进行权限的认证，即增加.policy文件并且在命令行中使用如下格式 java
       * -Djava.security.policy=java.policy test.rmi.HelloServer
       */
       /* System.setSecurityManager(new RMISecurityManager()); */
       Registry registry = null;
       ResourceBundle resource = ResourceBundle.getBundle("config");
       try {
           /**
           * 启动注册服务器，使用了这个语句就不再需要在命令行环境中启动registry服务了
           */
           registry = LocateRegistry.getRegistry();
           /* 若没有获得连接，则此句会抛出异常，后面在捕获后进行相关处理 */
           registry.list();
           System.out.println("Register the exist server!");
       } catch (RemoteException re) {
           try {
               int port = Integer.parseInt(resource.getString("HelloServer.RegistryServerPort"));
               registry = LocateRegistry.createRegistry(port);
               System.out.println("Create Registry Server!");
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
       try {
           HelloServer helloServer = new HelloServer("Hello");
           registry.rebind(resource.getString("HelloServer.HelloServerName"), helloServer); //$NON-NLS-1$
           System.out.println("HelloServer server start!"); //$NON-NLS-1$
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
}

/*HelloClient*/

package rmi.cn.riil.demo;

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.util.ResourceBundle;

/**
*
* @author ZB
*
*/
public class HelloClient {

   public static void main(String[] args) {
       try {
           ResourceBundle resource = ResourceBundle.getBundle("config");
           /* 注册服务器 */
           String hostName = resource.getString("HelloServer.RegistryServerName");
           int port = Integer.parseInt(resource.getString("HelloServer.RegistryServerPort"));
           Registry registry = LocateRegistry.getRegistry(hostName, port);

           Hello hello = (Hello) registry.lookup(resource.getString("HelloServer.HelloServerName"));
           String message = hello.sayHello();
           System.out.println(message);

       } catch (Exception e) {
           e.printStackTrace();
       }
   }
}

#config.properties
HelloServer.RegistryServerPort=1111
HelloServer.HelloServerName=HelloServer
HelloServer.RegistryServerName=127.0.0.1

首先运行HelloServer服务器 java test.rmi.HelloServer,提示

最后运行HelloClient客户端 java test.rmi.HelloClient
屏幕输出HelloWorld，这样，一个最简单的rmi远程调用成功了

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