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分布式对象-如何使用RMI和CORBA,在java中

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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>RMI 注册表</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 4 页（共8 页）</nobr></font></td>
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<p>我们必须能够定位远程对象，所以 RMI 使用名为 <i>RMI 注册表</i>的名称服务器来执行这一功能。</p>
<p>一个对象有一个名称（在本例中，它是&ldquo;Example&rdquo;）和一个机器位置（在本例中，它是&ldquo;localhost&rdquo;）。在下列代码中，我们创建一个 <code>ExampleServer</code> 对象，并在 localhost 的名称服务器中创建一个表示它的项，取名为 Example。</p>
<p>这里，我们使用 <code>rebind()</code> 方法以避免当已存在相同项时出错；不然，我们可以使用 <code>bind</code> 方法。只要注册表进程一直是活动的，我们就只需运行该代码一次。注册表不是持久的。</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
// Server.java
//
// Server program to create the "Example" remote object and enter it
// into the RMI registry
//
import java.io.*;
import java.rmi.*;
import java.rmi.server.*;
public class Server {
public static void main ( String[] args ) throws
    RemoteException, java.net.MalformedURLException {
  //
  // Create a new example object and enter it into the RMI registry
  // located on "localhost" under the alias "Example"
  ExampleServer es = new ExampleServer();
  Naming.rebind( "rmi://localhost/Example", es );
  }
}
</code>
</pre>
<p>接着，我们会看看如何构建客户机程序来进行远程方法调用。</p>
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