CORBA组件化编程
正式开始之前解决一下自己遗留的问题:
- java环境变量配置,因为当时懒,想着装了IDE,我也不会用cmd运行,so……只因为作业配置过一次临时的环境变量 临时java环境变量配置,所以今天配置了一下环境变量,教程网上很多,例如:java环境变量配置(不知道是哪位大佬的解读,感觉很不错)
- 打开cmd窗口问题:也是因为当时配置python的时候懒,感觉用 cd进入指定文件的cmd很讨厌,所以设置了在指定文件夹内点击会显示OpenCMDHere,或者按住Shift+鼠标右键
- OK,撒花~~~
开始正题:
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。
Java版CORBA程序1——HelloWorld
第一步:为了方便起见,新建一个文件夹,在里面新建TXT,写入以下代码:
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。
第二步:
编译IDL接口:在打开的cmd执行:idlj –fall HelloWorld.idl
编译结果生成sample包,生成下述文件
第三步:
编写并编译服务端程序:HelloWorldServer.java
新建TXT,写入以下代码:
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);
//**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);
}
}
}
编译:
在cmd执行:javac HelloWorldSever.java
如果……和中文有关
emmm这个就不重新编译,一会防火墙提醒就允许访问就可以了!
生成Class文件:
第四步:编写并编译客户端程序: HelloWorldClient.java
代码:
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);
}
}
}
方法同第三步:
第五步:运行
启动名字服务器:在指定cmd执行:tnameserv -ORBInitialPort 1050
启动服务端程序:在指定cmd执行:java HelloWorldServer -ORBInitialPort 1050
输出:HelloWorld is running
启动客户端程序:在指定cmd执行:java HelloWorldClient -ORBInitialPort 1050
输出:Hello World!
注意:要打开三个cmd
以上就是小小的步骤……
JAVA版CORBA程序2——Counter
第一步:
新建TXT:
代码如下:
module CounterApp{
interface Counter{
readonly attribute long value;
void inc();
void dec();
};
};
第二步:编译IDL接口:X:\corba>idlj –fall counter.idl
第三步:编写并编译对象实现代码:CounterImpl.java
第四步:编写并编译服务端程序: Server.java
第五步:编写并编译客户端程序: Client.java
代码:
第三部代码:
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;
}
}
第四部代码:
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);
}
}
}
第五部代码:
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);
}
}
}
编译:javac 程序名字.java
编译后生成class文件:
第六步: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
撒花~~~