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Program that enabled applet calculator

Posted By: Sebastian Evans     Category: Java     Views: 8727

Write a CORBA enabled applet calculator.

Code for Program that enabled applet calculator in Java

----------------------------------------------------------------------------------
                    IDL
----------------------------------------------------------------------------------
module CalciApp
{
    interface Calci
         {
               void Calculator();
               oneway void shutdown();
          };
};

-------------------------------------------------------------------------------------------------
                    Server
-------------------------------------------------------------------------------------------------

import CalciApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.PortableServer.POA;

import java.util.Properties;

class CalciImpl extends CalciPOA 
{
          private ORB orb;

          publicvoid setORB(ORB orb_val) 
          {
                orb = orb_val; 
          }    
          publicvoid Calculator() 
          {
                   System.out.print("Calculator Starts....");               
          }
          publicvoid shutdown() 
          {
                  orb.shutdown(false);
          }
}

publicclass CalciServer 
{
           publicstaticvoid main(String args[]) 
           {
                try
                { 
                      ORB orb = ORB.init(args, null);
 
                      POA rootpoa = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));
                      rootpoa.the_POAManager().activate();  

                      CalciImpl calciImpl = new CalciImpl();
                      calciImpl.setORB(orb); 

                      org.omg.CORBA.Object ref = rootpoa.servant_to_reference(calciImpl);
                      Calci href = CalciHelper.narrow(ref);  
      
                     org.omg.CORBA.Object objRef = orb.resolve_initial_references("NameService");
                     NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
  
                     String name = "Calci";
                     NameComponent path[] = ncRef.to_name( name );
                     ncRef.rebind(path, href);

                     System.out.println("Calci Server ready and waiting ...");

                     orb.run();
               }     
               catch (Exception e) 
               {
                     System.err.println("ERROR: " + e);
                     e.printStackTrace(System.out);
               }      
               System.out.println("Calci Server Exiting ...");    
         }
}

-------------------------------------------------------------------------------------------------
                    Client
-------------------------------------------------------------------------------------------------

import CalciApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import java.awt.Graphics;
import java.awt.*;

publicclass CalciApplet extends java.applet.Applet
{
          TextField t1;
          Button b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, bp,bm, bml, bd, be, bst;
          int m=0;
          int op=0;
          publicvoid init() 
          { 
        t1=new TextField(20);
                b0=new Button("0");
                b1=new Button("1");
                b2=new Button("2");
                b3=new Button("3");
                b4=new Button("4");
                b5=new Button("5");
                b6=new Button("6");
                b7=new Button("7");
                b8=new Button("8");
                b9=new Button("9");
                bp=new Button("+");
                bm=new Button("-");
                bml=new Button("*");
                bd=new Button("/");
                be=new Button("=");
                bst=new Button("AC");

        add(t1);
                add(b0); add(b1); add(b2); add(b3);
                add(b4); add(b5); add(b6); add(b7);
                add(b8); add(b9); add(bp); add(bm);
                add(bml); add(bd); add(be); add(bst);
                t1.setText("0");

                try
        {
                   ORB orb = ORB.init(this, null);
       
                           org.omg.CORBA.Object objRef = orb.resolve_initial_references("NameService");
                        NamingContext ncRef = NamingContextHelper.narrow(objRef);
         
            NameComponent nc = new NameComponent("Calci", "");
                        NameComponent path[] = {nc};    
            Calci calciRef = CalciHelper.narrow(ncRef.resolve(path));
      
                  calciRef.Calculator();    
        }
                catch(Exception e)
                {         
                    System.out.println("ERROR : " + e) ;
                        e.printStackTrace(System.out); 
                }
                    
       }

       public boolean action(Event e1, java.lang.Object o1)
       {
                   if(e1.arg.equals("0"))
                          t1.setText(t1.getText()+"0");
                   if(e1.arg.equals("1"))
                          t1.setText(t1.getText()+"1");
                   if(e1.arg.equals("2"))
                          t1.setText(t1.getText()+"2");
                   if(e1.arg.equals("3"))
                          t1.setText(t1.getText()+"3");
                   if(e1.arg.equals("4"))
                          t1.setText(t1.getText()+"4");
                   if(e1.arg.equals("5"))
                          t1.setText(t1.getText()+"5");
                   if(e1.arg.equals("6"))
                           t1.setText(t1.getText()+"6");
                   if(e1.arg.equals("7"))
                          t1.setText(t1.getText()+"7");
                   if(e1.arg.equals("8"))
                          t1.setText(t1.getText()+"8");
                   if(e1.arg.equals("9"))
                          t1.setText(t1.getText()+"9");
                   if(e1.arg.equals("+"))
                   {
            m=Integer.parseInt(t1.getText());
                        t1.setText("0");
                        op=0;
           }
                   if(e1.arg.equals("-"))
                   {
                       m=Integer.parseInt(t1.getText());
                        t1.setText("0");
                        op=1;
                   }
                   if(e1.arg.equals("*"))
                   {
            m=Integer.parseInt(t1.getText());
                        t1.setText("0");
                        op=2;
                   }
                   if(e1.arg.equals("/"))
                   {
                       m=Integer.parseInt(t1.getText());
                        t1.setText("0");
                        op=3;
                   }
                   if(e1.arg.equals("="))
                   {
                       switch(op)
                        {
                            case 0:
                                    m=m+Integer.parseInt(t1.getText());
                                        break;
                                  case 1:
                                    m=m-Integer.parseInt(t1.getText());
                                        break;
                                  case 2:
                                        m=m*Integer.parseInt(t1.getText());
                                        break;
                                  case 3:
                    m=m/Integer.parseInt(t1.getText());
                                        break;
                         }
                         t1.setText(String.valueOf(m));
                   }
                   if(e1.arg.equals("AC"))
                        t1.setText("0");
                   returntrue;
         }       
}

-------------------------------------------------------------------------------------------------
                    Applet (HTML File)
-------------------------------------------------------------------------------------------------

<HTML><HEAD>
<TITLE>Java IDL Getting Started: Running Calculator Applet</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<H1 ALIGN=CENTER>Running the Calculator Applet</H1>
<HR><P>If all goes well, the applet appears below:<P>
<APPLET CODE=CalciApplet.class       WIDTH=500        HEIGHT=300>
<PARAM name="org.omg.CORBA.ORBInitialHost"value=localhost>
<PARAM name="org.omg.CORBA.ORBInitialPort"value=1050>
</APPLET>
</BODY>
</HTML>
  
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Sebastian Evans
Sebastian Evans author of Program that enabled applet calculator is from London, United Kingdom.
 
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