CORBA例子（转）————————我也不知道是什麽东东:-)

答案：Below is a simple example of a CORBA program
download the source file 

1. produce a idl file like this
   hello.idl
   module HelloApp {
     interface Hello    {         
         string sayHello();
    };
  };

2. produce stub and skeleton files through idltojava.exe
   idltojava hello.idl
   idltojava is not include in the jdk. But you can download it from idldojava.

3. write a server program like this 

// HelloServer.java 
  
import HelloApp.*;

import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;

import java.io.*;
class HelloServant extends _HelloImplBase 
{
    public String sayHello()
    {
       return "\nHello world !!\n"; 
    }   
  
}

public class HelloServer {

    public static void main(String args[])
    {
    try{
        // create and initialize the ORB
        ORB orb = ORB.init(args, null);

        // create servant and register it with the ORB
        HelloServant helloRef = new HelloServant();
        orb.connect(helloRef);

        // get the root naming context
        org.omg.CORBA.Object objRef = 
        orb.resolve_initial_references("NameService");
        NamingContext ncRef = NamingContextHelper.narrow(objRef);

        // bind the Object Reference in Naming
        NameComponent nc = new NameComponent("Hello", "");
        NameComponent path[] = {nc};
        ncRef.rebind(path, helloRef);

        // wait for invocations from clients
            java.lang.Object sync = new java.lang.Object();
            synchronized (sync) {
                sync.wait();
            }

    } catch (Exception e) {
        System.err.println("ERROR: " + e);
        e.printStackTrace(System.out);
    }
    }
}    

4. write a client program like this
// HelloClient.java
import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CORBA.*;

public class HelloClient 
{
    public static void main(String args[])
    {
    try{
        // create and initialize the ORB
        ORB orb = ORB.init(args, null);

            // get the root naming context
            org.omg.CORBA.Object objRef = 
        orb.resolve_initial_references("NameService");
            NamingContext ncRef = NamingContextHelper.narrow(objRef);
            // test
            System.out.println("OK..");                
            // resolve the Object Reference in Naming
            NameComponent nc = new NameComponent("Hello", "");
            NameComponent path[] = {nc};
            Hello helloRef = HelloHelper.narrow(ncRef.resolve(path));

        // call the Hello server object and print results
           //String oldhello = helloRef.lastMessage();
           //System.out.println(oldhello);
        String Hello = helloRef.sayHello();
        System.out.println(Hello);

    } catch (Exception e) {
        System.out.println("ERROR : " + e) ;
        e.printStackTrace(System.out);
    }
    }
}

5. complie these files

   javac *.java HelloApp/*.java

6. run the application
   
  a. first you've to run the Name Service prior to the others likethis
     c:\>tnameserv
  b. run server
     c:\>java HelloServer
  c. run client 
     c:\>java HelloClient

 If you have problems with this example, do let me know!

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