CORBA组件编程

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该博客围绕Java版CORBA组件化开发实验展开，目的是掌握组件化开发概念、CORBA模型及ORB机制与编程方法。实验内容包括配置JDK环境、编写编译IDL接口、服务端和客户端程序，还进行运行测试与调试等，最后给出两个Java版CORBA程序的运行结果。

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一.实验目的

掌握组件化开发的概念，了解CORBA模型及ORB机制；
掌握CORBA组件编程方法。

二.实验内容

1.配制环境JDK环境：按照java课本来就好

2.编写编译IDL接口

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。

3.编写编译服务端程序

4.编写编译客户端程序

针对3.4有以下注意：

（1）在编译客户端服务端程序时，输入命令时要加后缀.java。

5.运行测试与调试

6.完成报告

三.组件实现

题目1.Java版CORBA程序1——HelloWorld

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
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!软工1702 王晨\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!软工1702班 王晨



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：
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(c);
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
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
输出：Counter value:0
Action(+/-/e)?

四.运行结果

题目1.Java版CORBA程序1——HelloWorld

1.编译IDL接口：X:\corba>idlj –fall HelloWorld.idl，编译结果生成sample包