JAVA版CORBA程序1——HelloWorld

步骤： 1.配制环境JDK环境。 2.编写编译IDL接口。 3.编写编译服务端程序。 4.编写编译客户端程序。

1 编写IDL接口HelloWorld.idl：

module sample{ interface HelloWorld{ string sayHello(); }; };

2编译IDL接口：X:\corba>idlj –fall HelloWorld.idl

HelloWorldStub.java HelloWorld.java HelloWorldHelper.java HelloWorldHolder.java HelloWorldOperations.java HelloWorldPOA.java

3 编写并编译服务端程序:HelloWorldServer.java

import sample.*; import org.omg.CosNaming.*; import org.omg.CosNaming.NamingContextPackage.*; import org.omg.CORBA.*; import org.omg.CORBA.portable.*; import org.omg.PortableServer.*; class HelloWorldServant extends HelloWorldPOA{ //对象实现类 public String sayHello(){ return "\nHello World!\n"; } } public class HelloWorldServer{ //服务程序 public static void main(String args[]){ try{ //初始化ORB ORB orb = ORB.init(args, null); //取根POA的引用 org.omg.CORBA.Object poaobj = orb.resolve_initial_references ("RootPOA"); org.omg.PortableServer.POA rootPOA = org.omg.PortableServer.POAHelper.narrow(poaobj); org.omg.PortableServer.POAManager manager = rootPOA.the_POAManager(); //创建伺服对象 HelloWorldServant objRef = new HelloWorldServant(); HelloWorld obj = objRef._this(orb); //绑定命名服务 NamingContext ncRef = NamingContextHelper.narrow(orb.resolve_initial_references("NameService")); NameComponent nc = new NameComponent("Hello", ""); NameComponent path[] = {nc}; ncRef.rebind(path, obj); //激活POA管理器 manager.activate(); //等待处理客户程序的请求 System.out.println("HelloWorld is running!"); orb.run(); }catch (Exception e) { System.err.println("ERROR: " + e); e.printStackTrace(System.out); } } }

4 编写并编译客户端程序: HelloWorldClient.java

import sample.*; import org.omg.CosNaming.*; import org.omg.CORBA.*; public class HelloWorldClient { public static void main(String args[]) { try{ ORB orb = ORB.init(args, null); org.omg.CORBA.Object objRef = orb.resolve_initial_references("NameService"); NamingContext ncRef = NamingContextHelper.narrow(objRef); NameComponent nc = new NameComponent("Hello",""); NameComponent path[] = {nc}; HelloWorld helloWorld = HelloWorldHelper.narrow(ncRef.resolve(path)); String hello = helloWorld.sayHello(); System.out.println(hello); } catch (Exception e) { System.out.println("ERROR : " + e) ; e.printStackTrace(System.out); } } }

5 运行 启动名字服务器：X:\corba >tnameserv -ORBInitialPort 1050 启动服务端程序：X:\corba >java HelloWorldServer -ORBInitialPort 1050 输出：HelloWorld is running 启动客户端程序：X:\corba >java HelloWorldClient -ORBInitialPort 1050 输出：Hello World!