sivaramaiah  
 
  Record 2 09/20/2017 9:49pm (UTC)
   
 

 

Record 2:File transfer:
Create a server that asks for a password, then opens a file and sends the file over the network connection. Create a client that connects to this server, gives the appropriate password, then captures and saves the file.
-----------------------------------------------------------------------------------------
Program 1: Interface program                          filet.java
import java.rmi.*;
 
public interface fileT extends Remote
{
            public String getfilepwd(String pwd) throws RemoteException;
}
 
Program 2: Implementation program                            fileTImp.java
import java.rmi.*;
import java.rmi.server.*;
import java.io.*;
 
public class fileTImp extends UnicastRemoteObject implements fileT
{
            private String fileurl;
 
            public fileTImp(String fname) throws RemoteException
            {
                        fileurl = fname;
            }
           
            public String getfilepwd(String pwd) throws RemoteException
            {
            if(pwd.compareTo("62075064")!=0) return "Invalid Password";
                        byte buffer[] = new byte[2056];
                        try
                        {
                                    FileInputStream fis = new FileInputStream(fileurl);
                                    int bytes = fis.read(buffer,0,2056);
                                    try
                                    {
                                                String str = new String(buffer,0,bytes,"Default");
                                                return(str);
                                    }
                                    catch(Exception e)
                                    { System.out.println("Error, maybe string error :"+e);
                                    }
                        }
                        catch(Exception e)
                        { System.out.println("Error at fileTImp : "+e);
                        }
            return "File not found";
            }
}
 
Program 3: Server program                                               fileTServer.java
import java.rmi.*;
import java.rmi.server.*;
 
public class fileTServer
{
            public static void main(String[] args)
            {
                        try
                        {
                        System.out.print("Constructing Server Implementation...");
                        fileTImp fileT1 = new fileTImp("secret.txt");
 
                        Naming.rebind("secretfile",fileT1);
 
                        System.out.print("Done!nWaiting for Invocations from client...n");
                        }
                        catch(Exception e)
                        { System.out.print("Error at fileTServer : "+e);
                        }
            }
}
Program 4: Client program                                                fileTClient.java
import java.rmi.*;
import java.rmi.server.*;
import java.io.*;
 
public class fileTClient
{
            public static void main(String[] args)
            {
           
                        try
                        {
                        System.out.print("Enter Password : ");
                        DataInputStream dis = new DataInputStream(System.in);
                        String password = dis.readLine();
                        System.out.print("Naming.lookup for Bindings...");
                        fileT file1 = (fileT) Naming.lookup("secretfile");
 
                        System.out.print("Done!n");
 
                        System.out.print("Info from Server: n"+file1.getfilepwd(password));
                       
                        }
                        catch(Exception e)
                        { System.out.print("Error at fileTClient : "+e);
                        }
            }
}
Program 5: Secrete file                                             secrete.txt
!!! Congratulations !!!
You opened the file which requires secret password.
 
RPC = Remote Procedure Call
RMI = Remote Method Invocation
CORBA = Common Object Broker Architecture
ORB = Object Request Brokarage
IIOP = Internet Inter ORB Protocol
JDBC = Java DataBase Connectivity
Java IDL = Java Interface Definition Language
 
Author: Siva Ramaiah
E-mail: siva_sriramula@yahoo.com
Created:10:43 AM 11/12/2008
Program 6: 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 7: 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 fileTImp
 
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 fileTServer
 
6. run client with policy created in step 4.
 
            java -Djava.security.policy=client.policy fileTClient
 
 
 
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