sivaramaiah  
 
  Record 3 11/22/2017 3:32am (UTC)
   
 
 
Record 3:Calculator:
Create a remote server that implements a calculator with basic functionalities like addition, subtraction, division, multiplication and client, which uses the remote calculator.
-----------------------------------------------------------------------------------------

Program 1: Interface program                          calc.java
import java.rmi.*;

public interface calc extends Remote
{
    float add(float a,float b) throws RemoteException;
    float sub(float a,float b) throws RemoteException;
    float mul(float a,float b) throws RemoteException;
    float div(float a,float b) throws RemoteException;
    double power(float base,float power) throws RemoteException;
Program 2: Implementation program                            calcImp.java
import java.rmi.*;
import java.rmi.server.*;
import java.lang.Math.*;

public class calcImp extends UnicastRemoteObject implements calc
{
    public calcImp() throws RemoteException
    {
        super();
    }
    
    public float add(float a,float b) throws RemoteException
    {
        float result=a+b;
        return result;
    }

    public float sub(float a,float b) throws RemoteException
    {
        float result=(float)a-b;
        return result;

    }

    public float mul(float a,float b) throws RemoteException
    {
        float result=(float)a*b;
        return result;

    }

    public float div(float a,float b) throws RemoteException
    {
    //if(b==0) return 0;
        float result=(float)a/b;
        return result;

    }

    public double power(float base,float power) throws RemoteException
    {
        double result= (double)Math.pow(base,power);
        return result;

    }

}
 
Program 3: Server program                                               calcServer.java
import java.rmi.*;
import java.rmi.server.*;

public class calcServer
{
    public static void main(String[] args)
    {
        try
        {
        System.out.print("Constructing Server Implementation...");
        calcImp calc1 = new calcImp();
        
        System.out.print("Done!nBinding Server Implementation...");

        Naming.rebind("RMICalc",calc1);

        System.out.print("Done!nWaiting for Invocations from client...n");    
        }
        catch(Exception e)
        { System.out.print("nError Generated in calcServer : "+e.toString()+"n");
        }
    }
}
Program 4: Client program                                                calcTClient.java
import java.rmi.*;
import java.rmi.server.*;
import java.io.*;

public class calcClient
{
    public static void main(String[] args)
    {
    float o1,o2;
    int choice=0;
    System.setSecurityManager(new RMISecurityManager());

        try
        {
        System.out.print("Naming.lookup for Bindings...");
        calc calcu = (calc) Naming.lookup("RMICalc");
        
        System.out.print("Done!n");
        
        DataInputStream dis = new DataInputStream(System.in);
        
        
            while(choice!=6)
            {
            System.out.println("n1. Addn2. Subtractn3. Multiplyn4. Dividen5. Powern6. Exit");
            System.out.print("Enter your choice : ");
            choice = Integer.parseInt(dis.readLine());
            if(choice==6) break;
            
            System.out.print("Enter first Number : ");
            o1 = Float.parseFloat(dis.readLine());
            System.out.print("Enter second Number : ");
            o2 = Float.parseFloat(dis.readLine());

            switch(choice)
            {
                case 1: System.out.println(o1+"+"+o2+"="+calcu.add(o1,o2)); break;
                case 2: System.out.println(o1+"-"+o2+"="+calcu.sub(o1,o2)); break;
                case 3: System.out.println(o1+"*"+o2+"="+calcu.mul(o1,o2)); break;
                case 4: System.out.println(o1+"/"+o2+"="+calcu.div(o1,o2)); break;
                case 5: System.out.println(o1+"^"+o2+"="+calcu.power(o1,o2)); break;
                default: System.out.println("Invalid Choice");
            }
            
            }

        }
        catch(Exception e)
        { System.out.print("Error Generated in commServer : "+e.toString()+"n");
        }
    System.exit(0);
    }
}

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

Program 5: Show Bindings                                                  showBingings.java
import java.rmi.*;
import java.rmi.server.*;
 
public class showBindings
{
            public static void main(String[] args)
            {
                        try
                        {
                                    String[] bindings = Naming.list("");
                                    for(int i=0;i<bindings.length;i++)
                                    System.out.println("Binding ["+(i+1)+"] => "+bindings[i]);
                        }
                        catch(Exception e)
                        { System.out.println("Error in showBindings : "+e.toString());     }
                       
            }
}
Program 6: clinet.policy                                    clinet.policy
grant
{
            permission java.net.SocketPermission
            "*:1024-65335","connect";
};
How to run the program
1. compile all java files
 
            javac *.java
 
2. use RMICompiler to create stubs & skeletons of Implementations
           
            rmic calcImp
 
3. run rmiregistry
           
            start rmiregistry
 
4. create policy file with following contents
 
            client.policy
            ~~~~~~~~~~~~~
           
            grant
            {
                        permission java.net.SocketPermission
                        "*:1024-65335","connect";
            };
 
5. run server
 
            java calcServer
 
6. run client with policy created in step 4.
 
            java -Djava.security.policy=client.policy calcClient
 
 

 
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