25.txt

电子工业出版社出版的《java2应用开发指南》配套光盘源代码

例程25-1
//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()
    {
       System.out.println("客户端发送调用请求。");
       return "Hello World."; 
    }     
}
public class HelloServer 
{
    public static void main(String args[])
    {
		try{
		    // 创建和初始化 ORB 
		    ORB orb = ORB.init(args, null);	
		    // 创建服务对象并将其向 ORB 注册
		    HelloServant helloRef = new HelloServant();
		    orb.connect(helloRef);	
		    // 获取根命名上下文
		    org.omg.CORBA.Object objRef = 
			orb.resolve_initial_references("NameService");
		NamingContext ncRef = NamingContextHelper.narrow(objRef);
		    // 绑定命名中的对象引用
		    NameComponent nc = new NameComponent("Hello", "");
		    NameComponent path[] = {nc};
		    ncRef.rebind(path, helloRef);	
		    // 等待来自客户机的调用 
            Java.lang.Object sync = new Java.lang.Object();
            synchronized (sync) {
                sync.wait();
            }
		} catch (Exception e) {
	    	e.printStackTrace(System.out);
		}
    }
}



例程25-2
//HelloClient.Java
import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CORBA.*;

public class HelloClient 
{
    public static void main(String args[])
    {
	try{
	    // 创建和初始化ORB
	    ORB orb = ORB.init(args, null);
        // 获取根命名上下文　　
org.omg.CORBA.Object objRef
=orb.resolve_initial_references("NameService");
        NamingContext ncRef = NamingContextHelper.narrow(objRef);             
        //解析命名中的对象引用 　　
        NameComponent nc = new NameComponent("Hello", "");
        NameComponent path[] = {nc};
        Hello helloRef = HelloHelper.narrow(ncRef.resolve(path));
		//调用CORBA对象的方法并打印出来
	    String Hello = helloRef.sayHello();
	    System.out.println(Hello);
	} catch (Exception e) {
	    e.printStackTrace(System.out);
	}
    }
}