一、题目分析 题目1.Java版CORBA程序1——HelloWorld 实现详解： 1 编写IDL接口HelloWorld.idl： 2编译IDL接口：X:\corba>idlj –fall HelloWorld.idl 3 编写并编译服务端程序:HelloWorldServer.java 4 编写并编译客户端程序: HelloWorldClient.java 5 运行 注意事项： 1、要转到class文件所在目录启动相应程序； 2、名字服务器、服务端和客户端要分别启动一个DOS命令提示符界面。 3、可采用批处理命令启动相应程序，分别为： (1)启动名字服务器： tnameserv -ORBInitialPort 1050 @pause (2)启动服务器端程序： java HelloWorldServer -ORBInitialPort 1050 @pause (3)启动客户端程序: java HelloWorldClient -ORBInitialPort 1050 @pause 要求编写实现显示“Hello，World！+班级+中文姓名”字符串。 题目2.JAVA版CORBA程序2——Counter 要求： 编写实现连加、连减和加减混合等数学++/- -运算，并进行测试。 实现详解： 1 编写IDL接口counter.idl： 2编译IDL接口：X:\corba>idlj –fall counter.idl 3 编写并编译对象实现代码：CounterImpl.java 4 编写并编译服务端程序: Server.java 5 编写并编译客户端程序: Client.java 5 运行 二、CORBA模型分析 题目1.Java版CORBA程序1——HelloWorld 题目2.JAVA版CORBA程序2——Counter 三、组件实现 题目一： 1 编写IDL接口HelloWorld.idl： module sample{ interface HelloWorld{ wstring sayHello(); }; }; 说明：CORBA处理字符串有：String和wstring两种类型，string类型主要用于处理ASCII类型的字符串，wstring用于处理多字节的字符串，例如：中文。 2编译IDL接口：X:\corba>idlj –fall HelloWorld.idl 编译结果生成sample包，生成下述文件 _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!1702堇忆\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!1702堇忆 题目二： 1 编写IDL接口counter.idl： module CounterApp{ interface Counter{ readonly attribute long value; void inc(); void dec(); }; }; 2编译IDL接口：X:\corba>idlj –fall counter.idl 编译结果生成CounterApp包，生成下述文件 _CounterStub.java Counter.java CounterHelper.java CounterHolder.java CounterOperations.java CounterPOA.java 3 编写并编译对象实现代码：CounterImpl.java import CounterApp.; public class CounterImpl extends CounterPOA { private int count; public CounterImpl(){ count = 0; } public void inc(){ count++; } public void dec(){ count - -; } public int value(){ return count; } } 4 编写并编译服务端程序: Server.java import CounterApp.; import java.io.; import org.omg.CosNaming.; import org.omg.CosNaming.NamingContextPackage.; import org.omg.CORBA.; import org.omg.CORBA.portable.; import org.omg.PortableServer.; public class Server { public static void main(String[] args){ try{ ORB orb = ORB.init(args, null); 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(); CounterImpl c_impl = new CounterImpl(); Counter c = c_impl._this(orb); NamingContext ncRef = NamingContextHelper.narrow(orb.resolve_initial_references(“NameService”)); NameComponent nc = new NameComponent(“Count”, “”); NameComponent path[] = {nc}; ncRef.rebind(path, c); FileOutputStream file = new FileOutputStream(“Counter.ref”); PrintWriter writer = new PrintWriter(file); String ref = orb.object_to_string©; writer.println(ref); writer.flush(); file.close(); System.out.println(“Server started.”+" Stop:Ctrl-c"); rootPOA.the_POAManager().activate(); orb.run(); }catch(IOException ex){ System.out.println(“File error:”+ex.getMessage()); System.exit(2); }catch(Exception ex){ System.out.println("Exception: "+ex.getMessage()); System.exit(1); } } } 5 编写并编译客户端程序: Client.java（如图3.10及3.11） import CounterApp.; import java.util.; import java.io.; import org.omg.CORBA.; import org.omg.CosNaming.; public class Client { public static void main(String[] args){ try{ ORB orb = ORB.init(args, null); org.omg.CORBA.Object obj = orb.resolve_initial_references(“NameService”); NamingContext ncRef = NamingContextHelper.narrow(obj); NameComponent nc = new NameComponent(“Count”,”"); NameComponent path[] = {nc}; String ref = null; try{ Scanner reader = new Scanner(new File(“Counter.ref”)); ref = reader.nextLine(); }catch(IOException ex){ System.out.println("File error: "+ex.getMessage()); System.exit(2); } obj = orb.string_to_object(ref); if(obj == null){ System.out.println(“Invalid IOR”); System.exit(4); } Counter c = null; try{ c = CounterHelper.narrow(obj); }catch(BAD_PARAM ex){ System.out.println(“Narrowing failed”); System.exit(3); } int inp = -1; do{ System.out.print(“Counter value: “+c.value()+”\nAction(+/-/e)?”); System.out.flush(); do{ try{ inp = System.in.read(); }catch(IOException ioe){} }while(inp != ‘+’ && inp != ‘-’ && inp != ‘e’); if(inp == ‘+’) c.inc(); else if(inp == ‘-’) c.dec(); }while(inp != ‘e’); }catch(Exception ex){ System.out.println("Exception: "+ex.getMessage()); System.exit(1); } } } 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 Server -ORBInitialPort 1050 输出：Server started. Stop: Ctrl-c 启动客户端程序：X:\corba >java Client -ORBInitialPort 1050 四、运行结果 题目一：Java版CORBA程序1——HelloWorld 题目2.JAVA版CORBA程序2——Counter
