COMPUTER NETWORKS PROGRAMS

1. WRITE A PROGRAM TO MANIPULATE THE IP ADDRESS OF A SYSTEM. 
import java.net.*;
public class inetaddrs
{
 public static void main(String args[]) throws UnknownHostException
 {
  InetAddress local=InetAddress.getLocalHost();
  System.out.println("Name :"+local.getHostName());
  System.out.println("Ip Address :"+local.getHostAddress());
 }
}

2. WRITE A PROGRAM TO OBTAIN THE INFORMATION ABOUT THE HOST, PORTNO. PROTOCOL, FILE AND PATH. 
import java.lang.*;
import java.io.*;
import java.net.*;
class url
{
 public static void main(String args[]) throws Exception
 {
  URL obj=new URL("http://www.dreamtechpress.com:80/index.html");
  System.out.println("Host Name is:"+obj.getHost());
  System.out.println("Port NO is:"+obj.getPort());
  System.out.println("Protocol is:"+obj.getProtocol());
  System.out.println("File used is:"+obj.getFile());
  System.out.println("Path used is:"+obj.getPath());
  System.out.println("External form is :"+obj.toExternalForm());
 }
}

3. WRITE A PROGRAM TO ACCEPT A WEBSITE NAME AND RETURN ITS IP ADDRESS. 
  

Import java.net.*;
public class acptipaddrs
{
 public static void main(String args[])
 {
  try
  {
   InetAddress ia=InetAddress.getByName("www.pavantutorials.in");
   System.out.println(ia);
  }catch(Exception ex)
  {
   System.out.println(ex);
  }
 }
}

4. WRITE A PROGRAM TO IMPLEMENT ECHO CLIENT AND ECHO SERVER 
 ECHO CLIENT :  

import java.io.*;
import java.net.*;
public class echoclient
{
 public static void main(String args[])
 {
  try
  {
 Socket s=new Socket("192.168.55.19",9999);
  BufferedReader r=new BufferedReader(new InputStreamReader(s.getInputStream()));
 PrintWriter w=new PrintWriter(s.getOutputStream(),true);
 BufferedReader con=new BufferedReader(new InputStreamReader(System.in));
   
   String line,rline;
   do
   {
    line=con.readLine();
    if(line!=null)
    {
     w.println(line);
    }
    rline=r.readLine();
    System.out.println("Echo from Server:"+rline);
   }while(!line.trim().equals("bye"));
  }catch(Exception err)
  {
  System.out.println("Error:"+err);
  }
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 ECHO SERVER:  

import java.io.*;
import java.net.*;
public class echoserver
{
 public static void main(String args[])
 {
  try
  {
  ServerSocket ser=new ServerSocket(9999);
  while(true)
  {
 Socket client=ser.accept();
   
 BufferedReader r=new BufferedReader(new InputStreamReader(client.getInputStream()));
    
 PrintWriter w=new PrintWriter(client.getOutputStream(),true);
 System.out.println("Welcome to java echo server");
    
 String line;
 
 do
 { line=r.readLine();
  if(line!=null)
  w.println("Server"+line);
  System.out.println(line);
 }while(!line.trim().equals("bye"));
    
         if(line.equals("bye"))
  System.exit(0);
  client.close();
   }
  }catch(Exception err)
  {
  System.out.println("Error"+err);
  }
 }
}

5. WRITE A PROGRAM TO IMPLEMENT REMOTE CLIENT/SERVER. 
 REMOTE CLIENT  

Import java.io.*;
Import java.net.*;
public class RemoteClient
{
 public static void main(String args[])
 {
  try
  {
 Socket s=new Socket("192.168.55.19",9999);
 BufferedReader r=new BufferedReader(new InputStreamReader(s.getInputStream()));
 PrintWriter w=new PrintWriter(s.getOutputSream(),true);
 BufferedReader con=new BufferedReader(new InputStreamReader(system.in));
 String line,rline;
   do
   {
    line=con.readLine();
    if(line!=null)
    {
     w.println(line);
    }
    rline=r.readLine();
   System.out.println("Echo from Server:"+rline);
   }while(!line.trim().equals("bye"));
  }catch(Exception ex)
  {
   System.out.println("Error:"+err);
  }
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 REMOTE SERVER  

import java.io.*;
import java.net.*;
public class RemoteServer
{
 public static void main(String args[])
 {
  try
  {
   ServerSocket ser=new ServerSocket(9999);
   while(true)
   {
  Socket soc=ser.accept();
 BufferedReader r=new BufferedReader(new InputStreamReader(soc.getInputStream()));
 PrintWriter w=new PrintWriter(soc.getOutputStream(),true);
  System.out.println("Welcome to Java RemoteServer");
    String line;
    do
    {
     line=r.readLine();
     if(line!=Null)
     w.println("Server : "+line);
     System.out.println(line);
    }while(!line.trim().equals("bye"));
    if(line.equals("bye"))
     System.exit(0);
     soc.close();
   }
  }catch(Exception ex)
  {
   System.out.println("Exception is:"+ex);
  }
 }
}

6. WRITE A PROGRAM TO IMPLEMENT TCP CLIENT SERVER. 
 TCP CLIENT  

import java.io.*;
import java.net.*;
public class TcpClient
{
 public static void main(String args[]) throws Exception
 {
 Socket s=new Socket("localhost",999);
 DataOutputStream dos=new DataOutputStream(s.getOutputStream());
 BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
 BufferedReader kb=new BufferedReader(new InputStreamReader(System.in));
 System.out.println("Start the chitchat type & press enter key");
 String str,str1;
  while(!(str=kb.readLine()).equals("exit"))
  {
   dos.writeBytes(str+"\n");
   str1=br.readLine();
   System.out.println(str1);
  }
  dos.close();
  br.close();
  kb.close();
  s.close();
  
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 TCP SERVER  

import java.io.*;
import java.net.*;
public class TcpServer
{
 public static void main(String args[]) throws Exception
 {
 ServerSocket ss=new ServerSocket(999);
 System.out.println("Server ready for chatting");
 Socket s=ss.accept();
 System.out.println("Connection established");
 PrintStream ps=new PrintStream(s.getOutputStream());
 BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
 BufferedReader kb=new BufferedReader(new InputStreamReader(System.in));
 while(true)
 {
   String str,str1;
   while((str=br.readLine())!=null)
   {
    System.out.println(str);
    str1=kb.readLine();
    ps.println(str1);
   }
    ps.close();
    br.close();
    kb.close();
    ss.close();
    s.close();
    System.exit(0);
   
  }
 }
}

7. WRITE A PROGRAM TO IMPLEMENT FTP CLIENT SERVER. 
 FTP CLIENT  

import java.io.*;
import java.net.*;
public class ftpclient
{
 public static void main(String args[]) throws Exception
 {
  Socket s=new Socket("LocalHost",5555);
  DataInputStream dis=new DataInputStream(s.getInputStream());
  DataInputStream dis1=new DataInputStream(System.in);
  DataOutputStream dos=new DataOutputStream(s.getOutputStream());
  String str;
  System.out.println("\nEnter File Name(path):");
  str=dis1.readLine();
  dos.writeBytes(str);
  dos.writeBytes("\n");
  FileOutputStream fo=new FileOutputStream("sss21.txt");
  int str1;
  while((str1=dis.read())!=-1)
  fo.write(str1);
  System.out.println("\nFile received Successfully");
  dis.close();
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 FTP SERVER  

import java.io.*;
import java.net.*;
public class ftpserver
{
 public static void main(String args[]) throws Exception
 {
  ServerSocket ss=new ServerSocket(5555);
  Socket s=ss.accept();
  DataOutputStream dos=new DataOutputStream(s.getOutputStream());
  DataInputStream dis=new DataInputStream(s.getInputStream());
  String s1;
  s1=dis.readLine();
  FileInputStream fi=new FileInputStream(s1);
  int str;
  while((str=fi.read())!=-1)
  dos.writeBytes(" "+(char)+str);
  System.out.println("File has been sent successfully");
  dos.close();
  s.close();
 }
}

8. WRITE A PROGRAM TO IMPLEMENT SMTP. 
 SMTP CLIENT  

import java.io.*;
import java.net.*;
class SmtpClient
{
 public static void main(String args[]) throws Exception
 {
  Socket s=new Socket("127.0.0.1",9999);
  DataInputStream dis=new DataInputStream(s.getInputStream());
  DataInputStream in=new DataInputStream(System.in);
  PrintStream ps=new PrintStream(s.getOutputStream());
  ps.println("Ready");
  System.out.println(dis.readLine());
  
  String strFrom=in.readLine();
  ps.println(strFrom);
  System.out.println(dis.readLine());
  
  String strTo=in.readLine();
  ps.println(strTo);
  System.out.println(dis.readLine());
  
  String strSub=in.readLine();
  ps.println(strSub);
  System.out.println(dis.readLine());
  
  while(true)
  {
   String msg=in.readLine();
   ps.println(msg);
   if(msg.equals("quit"))
   {
   System.out.println("Message is delevered to Server and Client Quits");
   break;
   }
  }
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 SMTP SERVER  

import java.net.*;
import java.io.*;
class SmtpServer
{
 public static void main(String args[]) throws Exception
 {
  ServerSocket ss=new ServerSocket(9999);
  Socket s=ss.accept();
  DataInputStream dis=new DataInputStream(s.getInputStream());
  PrintStream ps=new PrintStream(s.getOutputStream());
  FileWriter f=new FileWriter("testmail.eml");
  String tel=dis.readLine();
  if(tel.equals("Ready"))
  System.out.println("Ready signal received from client");
  
  ps.println("Enter from address:");
  String from=dis.readLine();
  f.write("From:"+from+"\n");
  
  ps.println("Enter the To Address :");
  String to=dis.readLine();
  f.write("To:"+to+"\n");
  
  ps.println("Enter the Subject :");
  String sub=dis.readLine();
  f.write("Subject:"+sub+"\n");
  
  ps.println("Enter the Message :");
  String msg=dis.readLine();
  f.write("\n Message:"+msg+"\n");
  f.close();
 }
}

9. WRITE A PROGRAM TO IMPLEMENT Domain Name System using UDP. 
 DNS CLIENT  

import java.io.*;
import java.net.*;
import java.util.*;
class DnsClient
{
 public static void main(String args[])throws IOException
 {
  
 DatagramSocket client=new DatagramSocket();
 InetAddress addr=InetAddress.getByName("127.0.0.1");
 byte[]sendbyte=new byte[1024];
        byte[]receivebyte=new byte[1024];
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
 System.out.println("Enter DOMAIN NAME OR IP address");
 String str=in.readLine();
 sendbyte=str.getBytes();
 DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr,1309);
 client.send(sender);
 DatagramPacket receiver= new DatagramPacket(receivebyte,receivebyte.length);
 client.receive(receiver);
 String s=new String(receiver.getData());
 System.out.println("IP adddress or DOMAIN NAME :"+s.trim());
 client.close();
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 DNS SERVER  

import java.io.*;
import java.net.*;
import java.util.*;
class DnsServer
{
 public static void main(String args[])throws IOException
 {  
 DatagramSocket server=new DatagramSocket(1309);
 byte[]sendbyte=new byte[1024];
 byte[]receivebyte=new byte[1024];
 DatagramPacket receiver=new DatagramPacket(receivebyte,receivebyte.length);
 server.receive(receiver);
 String str=new String(receiver.getData());
 String s=str.trim();
 System.out.println(s);
 InetAddress addr=receiver.getAddress();
 int port=receiver.getPort();  
 String ip[]={"165.165.80.80","165.165.79.1"};
 String name[]={"www.aptitudesource.com","www.Sharifguys.com"};
 for(int i=0;i < ip.length;i++)
 {
  if(s.equals(ip[i]))
  {
 sendbyte=name[i].getBytes();
 DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr, port);
 server.send(sender);
 }else if(s.equals(name[i]))
 {
 sendbyte=ip[i].getBytes();
 DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr, port);
 server.send(sender);
 server.close();
 } 
       } 
    }
}

10. WRITE A PROGRAM TO IMPLEMENT SIMPLE CALCULATOR ON A REMOTE HOST AND INVOKE OPERATIONS FROM A CLIENT USING RMI. 
 INTERFACE  

import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Cal extends Remote
{
 public long add(long a, long b) throws RemoteException;
 public long sub(long a, long b) throws RemoteException;
 public long mul(long a, long b) throws RemoteException;
 public long div(long a, long b) throws RemoteException;
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 INTERFACE IMPLEMENTATION  

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
public class CalcImpl extends UnicastRemoteObject implements Cal
{
 public CalcImpl() throws RemoteException
 {
  super();
 }
 public long add(long a, long b) throws RemoteException
 {
  return a+b;
 }
 public long sub(long a, long b) throws RemoteException
 {
  return a-b;
 }
 public long mul(long a, long b) throws RemoteException
 {
  return a*b;
 }
 public long div(long a, long b) throws RemoteException
 {
  return a/b;
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 CLIENT  

import java.io.*;
import java.rmi.Naming;
public class CalcClient
{
 public static void main(String args[])
 {
  try
  {
  Cal obj=(Cal)Naming.lookup("//127.0.0.1:1099/Calobject");
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  System.out.println("Enter any two numbers:");
  int a=Integer.parseInt(br.readLine());
  int b=Integer.parseInt(br.readLine());
  System.out.println("Addition is :"+obj.add(a,b));
  System.out.println("Subtraction is :"+obj.sub(a,b));
  System.out.println("Muultiplication is :"+obj.mul(a,b));
   System.out.println("Division is :"+obj.div(a,b));
  }catch(Exception e)
  {
   System.out.println(e);
  }
 }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
 SERVER  

import java.rmi.Naming;

public class CalcServer
{
 CalcServer()
 {
  try
  {
   Cal obj=new CalcImpl();
   Naming.rebind("rmi://127.0.0.1:1099/Calobject",obj);
  }catch(Exception e)
  {
   e.printStackTrace();
  }
 }
 public static void main(String args[])
 {
  new CalcServer();
 }
}

Comments

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    ReplyDelete
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