JAVA的Corba客户端 - 服务端通信实现

IDE:Eclipse 3.4.1

先在Eclipse建立两个Java Project

1.然后定义 IDL .

内容如下:

module helloapp {
    interface Hello {
        string sayHello();
        oneway void shutdown();
    };
};

**这里注意, } 后面的 ";"一定要写上,不然会编译错误

2. 右键这个HelloApp.idl文件

点击,Change to parent folder in Shell

点击OK , Eclipse会打开Shell视图,是命令行视图,其实和CMD是一个作用.

这里我们执行命令 : idlj -fall HellApp.idl

3. 然后我们到项目目录(H:\DEVELOPING\UMM\workspace\testCorbaServer\src\server)下就能看到多生成了一个文件夹 -- helloapp

打开里面试一些java接口类

4.在服务端建立一个package 名字跟 idl内容里的module相同,这里我们是 ' helloapp '

然后把类复制到这个包下面

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第二部分 实现IDL生成的类的接口

1.实现服务端如图

内容如下:

package server;


import org.omg.CORBA.ORB;

import helloapp.HelloPOA;

public class HelloImpl extends HelloPOA {

    private ORB orb;

    public void setOrb(ORB orb) {
        this.orb = orb;
    }

    @Override
    public String sayHello() {
        return "\nHello World!!\n";
    }

    @Override
    public void shutdown() {
        orb.shutdown(false);
    }

}

以上,服务端的"服务"就写好了, 下面还要在服务端写一个入口类,把你的服务"注册"上.

内容如下:

package server;

import helloapp.Hello;
import helloapp.HelloHelper;

import org.omg.CORBA.ORB;
import org.omg.CORBA.ORBPackage.InvalidName;
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContextExt;
import org.omg.CosNaming.NamingContextExtHelper;
import org.omg.CosNaming.NamingContextPackage.CannotProceed;
import org.omg.CosNaming.NamingContextPackage.NotFound;
import org.omg.PortableServer.POA;
import org.omg.PortableServer.POAHelper;
import org.omg.PortableServer.POAManagerPackage.AdapterInactive;
import org.omg.PortableServer.POAPackage.ServantNotActive;
import org.omg.PortableServer.POAPackage.WrongPolicy;

public class Main {
    public static void main(String[] args) {
        try {
            // 创建一个ORB实例
            ORB orb = ORB.init(args, null);

            // 得到一个RootPOA的引用,并激活POAManager
            POA rootpoa = POAHelper.narrow(orb
                    .resolve_initial_references("RootPOA"));
            rootpoa.the_POAManager().activate();
            
            // create servant and register it with ORB
            // 创建一个HelloImpl实例(servant),并注册到ORB上
            HelloImpl helloImpl = new HelloImpl();
            helloImpl.setOrb(orb);
            
            // 在服务中得到对象的引用
            org.omg.CORBA.Object ref = rootpoa.servant_to_reference(helloImpl);
            Hello href = HelloHelper.narrow(ref);
            
            //得到一个根名称的上下文 
            org.omg.CORBA.Object objRef = orb.resolve_initial_references("NameService"); 
            
            // Use NamingContextExt which is part of the Interoperable 
            // Naming Service (INS) specification. 
            NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef); 
             
            // 在命名上下文中绑定这个对象
            String name = "Hello";
            NameComponent path[] = ncRef.to_name(name);
            ncRef.rebind(path, href);
            
            System.out.println("HelloServer ready and waiting ..."); 

            //启动线程服务，等待客户端的调用 
            orb.run(); 
        } catch (InvalidName e) {
            e.printStackTrace();
        } catch (AdapterInactive e) {
            e.printStackTrace();
        } catch (ServantNotActive e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (WrongPolicy e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (org.omg.CosNaming.NamingContextPackage.InvalidName e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NotFound e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (CannotProceed e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
         System.out.println("HelloServer Exiting ..."); 
    }
}

注意 :这里虽然是入口,可是不能直接右键run as - > Java Application

---------------------------------------

实现客户端

1.要把服务端生成的工具类复制到客户端(最好包结构一致) 如图

2.编写客户端调用.

内容如下:

package client;

import helloapp.Hello;
import helloapp.HelloHelper;

import org.omg.CORBA.ORB;
import org.omg.CosNaming.NamingContextExt;
import org.omg.CosNaming.NamingContextExtHelper;

public class HelloClient {
    static Hello helloImpl;
    
    public static void main(String[] args) {
        try {
            // 创建一个ORB实例
            ORB orb = ORB.init(args, null);
            
            // 获取根名称上下文
            org.omg.CORBA.Object objRef = orb.resolve_initial_references("NameService");
            
            // Use NamingContextExt instead of NamingContext. This is 
            // part of the Interoperable naming Service. 
            NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef); 
            
            // 从上下文中获取接口实现对象
            String name = "Hello";
            helloImpl = HelloHelper.narrow(ncRef.resolve_str(name));
            System.out.println(helloImpl.sayHello()); 
            System.out.println("asdfasdfdasf"); 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}