JAVA版CORBA程序2——Counter

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博客围绕CORBA编写实现连加、连减和加减混合等数学运算并进行测试。详细步骤包括编写IDL接口、编译接口生成相关文件，编写并编译对象实现代码、服务端和客户端程序，最后运行，需依次启动名字服务器、服务端程序和客户端程序。

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。
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);   
}   
}   
}

最后一步：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