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<title>csdn_Java RMI-IIOP 入门</title>
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<TD WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" nowrap >Java RMI-IIOP 入门
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<TD WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" nowrap ><p>作者：jdeveloper</p>
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<pre>
RMI-IIOP出现以前，只有RMI和CORBA两种选择来进行分布式程序设计。RMI-IIOP综合了RMI
和CORBA的优点，克服了他们的缺点，使得程序员能更方便的编写分布式程序设计，实现分布式计算。
首先，RMI-IIOP综合了RMI的简单性和CORBA的多语言性（兼容性），其次RMI-IIOP克服了RMI只能
用于Java的缺点和CORBA的复杂性（可以不用掌握IDL）.
下面给出了一个非常的简单的RMI-IIOP程序，该程序是在上一个例子（Java2 RMI入门的基础）
上修改完成的，可以对比两个程序的区别。
1. <font color="#FFAA00">实现远程接口，生成远程对象，存根（Stub）和框架(Skeleton)</font>
<font color="#FFAA00">实现远程接口</font>,远程接口告诉JVM：实现了该接口的对象可以远程调用及有哪些方法可以调用。
本例子中定义了sayHello（）。由于远程调用会涉及到网络通讯，因此这些方法都要抛出RemoteException.
远程接口和远程对象可以由A开发，并把远程接口(Hello)d打包分给Client端开发者B。
建立f:\rmi_iiop目录，把<a href="Hello.java" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/Hello.java">Hello.java</a>和<a href="HelloImpl.java" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/HelloImpl.java">HelloImpl.java</a>拷贝到该目录中。
// <a href="Hello.java" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/Hello.java">Hello.java</a>
package jdeveloper.rmi;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Hello extends Remote {
String sayHello() throws RemoteException;
}
<font color="#FFAA00">生成远程对象</font>.
// <a href="HelloImpl.java" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/HelloImpl.java">HelloImpl.java</a>
package jdeveloper.rmi_iiop;
import javax.naming.*;
import java.rmi.RemoteException;
import java.rmi.RMISecurityManager;
//import java.rmi.server.UnicastRemoteObject;
import javax.rmi.PortableRemoteObject;
public class HelloImpl extends PortableRemoteObject
implements Hello {
public HelloImpl() throws RemoteException {
super();
}
public String sayHello() {
return "Hello World!";
}
public static void main(String args[]) {
// Create and install a security manager
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
}
try {
Hello obj = new HelloImpl();
// Bind this object instance to the name "HelloServer"
//***** old code for rmi
// Naming.rebind("HelloServer", obj);
//***** new code for rmi-iiop
Context initialNamingContext = new InitialContext();
initialNamingContext.rebind("HelloServer", obj);
System.out.println("HelloServer bound in registry");
} catch (Exception e) {
System.out.println("HelloImpl err: " + e.getMessage());
e.printStackTrace();
}
}
}
<font olor="#FFAA00">存根（Stub）和框架(Skeleton)</font>
f:
cd \rmi_iiop
set classpath=.;%classpath%
javac -d . Hello.java
javac -d . HelloImpl.java
rmic -iiop -d . jdeveloper.rmi_iiop.HelloImpl
这一步将生成<_Interface>_stub.class,<_InterfaceImpl>_Tie.class:
_Hello_Stub.class和_HelloImpl_Tie.class
2. <font color="#FFAA00">实现Client端程序</font>
// <a href="HelloClient.java" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/HelloClient.java">HelloClient.java</a>
package jdeveloper.rmi_iiop;
import java.rmi.RMISecurityManager;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.NotBoundException;
import javax.rmi.PortableRemoteObject;
import javax.naming.*;
public class HelloClient {
public static void main(String args[]) throws Exception{
System.setSecurityManager(new RMISecurityManager());
Context initialNamingContext = new InitialContext();
Hello RemoteObj = (Hello) PortableRemoteObject.narrow(
initialNamingContext.lookup("iiop://"+ args[0] +"/HelloServer"),
Hello.class
);
System.out.println(RemoteObj.sayHello());
}
}
把HelloClient.java拷贝到目录f:\rmi_iiop中。
f:
cd \rmi_iiop
javac -d . HelloClient.java
3. <font color="#FFAA00">运行程序</font>
启动DOS窗口
运行 tnameserv
把 <a href="server.bat" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/server.bat">server.bat</a> 和 <a href="policy" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/policy">policy</a> 放到f:\rmi_iiop\
启动新的DOS窗口
运行 server
启动新的DOS窗口
把 <a href="client.bat" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/client.bat">client.bat</a> 放到f:\rmi_iiop\
运行 client hostname
<a href="server.bat" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/server.bat">server.bat</a>
set CP=%classpath%
set classpath=.;%classpath%
java -Djava.naming.factory.initial=com.sun.jndi.cosnaming.CNCtxFactory
-Djava.naming.provider.url=iiop://hjc:900 -Djava.security.policy=policy jdeveloper.rmi_iiop.HelloImpl
set classpath=%CP%
<a href="client.bat" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/client.bat">client.bat</a>
set CP=%classpath%
set classpath=.;%classpath%
java -Djava.naming.factory.initial=com.sun.jndi.cosnaming.CNCtxFactory
-Djava.naming.provider.url=iiop://hjc:900 -Djava.security.policy=policy jdeveloper.rmi_iiop.HelloClient %1
set classpath=%CP%
<a href="policy" tppabs="http://www.chinajavaworld.com/doc/rmi_iiop/policy">policy</a>
grant {
// Allow everything for now
permission java.security.AllPermission;
};
</pre>
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