第五章组件化开发方法

xiaoxiao2023-10-13 144

一、题目：

实验目的

1. 掌握组件化开发的概念，了解CORBA模型及ORB机制；

2. 掌握CORBA组件编程方法。

实验内容

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。

5.运行测试与调试。

6.完成报告。

二、CORBA模型分析

三、组件实现

题目1.Java版CORBA程序1——HelloWorld

实现详解：

1 编写IDL接口HelloWorld.idl：

module sample{

interface HelloWorld{

string 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!\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!

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

4、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：

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);

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

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第五章 组件化开发方法

第五章组件化开发方法