java rmi简单例子

----------接口------------
import java.rmi.*;
public interface HelloIn extends java.rmi.Remote{
 String sayHello() throws RemoteException;
}
--------实现类-------------
import java.rmi.*;
import java.net.*;
import java.rmi.registry.*;
import java.rmi.server.*;
public class Hello extends java.rmi.server.UnicastRemoteObject implements HelloIn{
 public Hello() throws RemoteException{
  super();
 }
 public String sayHello() throws RemoteException{
  return "Hello,World!";
 }
 public static void main(String[] args){
     if(System.getSecurityManager()==null)
     {
   System.setProperty( "java.security.policy", "java.policy" );
         System.setSecurityManager(new java.rmi.RMISecurityManager());
     }
  try{
      HelloIn h=new Hello();
      java.rmi.Naming.rebind("hello",h);
      System.out.print("Ready......");
   }
   catch(Exception e){
    e.printStackTrace();
   }
 }
}
-------------测试类----------------
import java.rmi.*;
import java.rmi.registry.*;
public class Helloworld{
 public static void main(String[] args){
   if(System.getSecurityManager()==null)
   {
  System.setProperty( "java.security.policy", "java.policy" );
  System.setSecurityManager(new java.rmi.RMISecurityManager());
   }
  try{
    HelloIn hi=(HelloIn)Naming.lookup("rmi://192.168.1.200/hello");
    System.out.println(hi.sayHello());
  }
  catch(Exception e){
   e.printStackTrace();
  }
  }
 }
运行步骤
第一步:生成class文件 javac -d . *.java
第二步:生成规则文件 java.policy
java.policy内容
/* AUTOMATICALLY GENERATED ON Wed Jan 20 15:03:35 CST 2010*/
/