ADVANCED
NETWORKING LAB
;1
Q 1: WAP to read a character and a string from console using buffered reader class.
[SOURCE CODE]
import java.io.*;
public class p1
{
public static void main(String args[]) throws IOException
{
BufferedReader ob= new BufferedReader(new InputStreamReader(System.in));
char c;
String s;
System.out.print("\n Enter the string: ");
s = ob.readLine();
System.out.print("\n Enter the character: ");
c=(char)ob.read();
System.out.println("\n\n The character is: "+c);
System.out.print(" The string is: "+s);
}
}
;2
Q 1: WAP to read a character and a string from console using buffered reader class.
[SCREENSHOTS]
D:\Java\jdk1.6.0_30\bin\0NETWORKING> javac p1.java D:\Java\jdk1.6.0_30\bin\0NETWORKING> java p1 Enter the string: Bob Enter the character: N The character is: N The string is: Bob
;3
Q 2: WAP to find out which of the first 1024 ports seems to be hosting TCP server on a specified host.
[SOURCE CODE]
import java.io.*;
import java.net.*;
import java.lang.*;
public class p2
{
public static void main(String args[]) throws UnknownHostException
{
String host;
if(args.length != 1)
host="localhost";
else
host=args[0];
try
{
for(int i=1;i<=1024;i++)
{
Socket s=new Socket(host,i);
System.out.println("The Server is running on " + host + " on port number " + i);
}
}
catch(IOException e)
{
System.out.println(" I/O Error. Message: "+e.getMessage());
}
}
}
;4
Q 2: WAP to find out which of the first 1024 ports seems to be hosting TCP server on a specified host.
[SCREENSHOTS]
D:\Java\jdk1.6.0_30\bin\0NETWORKING> java p2 localhost I/O Error. Message: Connection refused: connect
;5
Q 3: WAP to print the address and the name of the local machine and of two well known sites.
[SOURCE CODE]
import java.io.*;
import java.net.*;
import java.lang.*;
public class p3
{
public static void main( String args[]) throws Exception
{
InetAddress local= InetAddress.getLocalHost();
System.out.println("\nAddress of Local Host: " + local);
InetAddress ad=InetAddress.getByName("www.yahoo.com");
System.out.println("\nIP Address of www.yahoo.com : " + ad);
InetAddress ads[]=InetAddress.getAllByName("www.google.com");
for (int i=0; i<ads.length;i++)
{
int j=i+1;
System.out.println("Address " + j + " of www.google.com : "
+ ads[i]);
}
}
}
;6
Q 3: WAP to print the address and the name of the local machine and of two well known sites.
[SCREENSHOTS]
D:\Java\jdk1.6.0_30\bin\0NETWORKING>javac p3.java D:\Java\jdk1.6.0_30\bin\0NETWORKING>java p3 Address of Local Host: mw-laptop/10.0.42.165 IP Address of www.yahoo.com : www.yahoo.com/106.10.170.118 Address 1 of www.google.com : www.google.com/74.125.236.17 Address 2 of www.google.com : www.google.com/74.125.236.20 Address 3 of www.google.com : www.google.com/74.125.236.16 Address 4 of www.google.com : www.google.com/74.125.236.19 Address 5 of www.google.com : www.google.com/74.125.236.18
;7
Q 4: WAP to create a client server application in which client sends some string to server and the server responds by converting it to uppercase (Remote server n client)
[SOURCE CODE]
import java.io.*;
import java.net.*;
class p4_server
{
public static void main(String args[])throws Exception
{
ServerSocket ss=new ServerSocket(1001);
System.out.println("Listening...");
while(true)
{
Socket s= ss.accept();
BufferedReader bin=new BufferedReader(new InputStreamReader(s.getInputStream()));
String s1= bin.readLine();
if(s1.equalsIgnoreCase("Shutdown"))
{
System.out.println(" Shutting Down. Program Stopped! ");
break;
}
System.out.println("\t#Contact with Client Established.");
String s2= s1.toUpperCase();
DataOutputStream d1=new DataOutputStream(s.getOutputStream());
d1.writeBytes(s2+'\n');
System.out.println("\t#Processed input and output returned.");
System.out.println("\n\nListening...");
}
}
}
;8
Q 4: WAP to create a client server application in which client sends some string to server and the server responds by converting it to uppercase (Remote server n client)
[SCREENSHOTS]
Client Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> javac p4_client.java D:\Java\jdk1.6.0_30\bin\0NETWORKING> java p4_client Enter a string in lower case: make me bigger Contacting Server... The received string is: MAKE ME BIGGER
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> javac p4_server.java D:\Java\jdk1.6.0_30\bin\0NETWORKING> java p4_server Listening... #Contact with Client Established. #Processed input and output returned. Listening... Shutting Down. Program Stopped!
;9
Q 5: WAP to design a client server application to implement one way chatting.
[SOURCE CODE]
SERVER SIDE PROGRAM
import java.io.*;
import java.net.*;
public class ChatServer
{
public static void main(String args[])throws IOException,UnknownHostException
{
String S1,S2;
ServerSocket SS=new ServerSocket(1001);
System.out.println("Receiving Message from the client...");
while(true)
{
Socket S=SS.accept();
BufferedReader bin=new BufferedReader(new InputStreamReader(S.getInputStream()));
DataOutputStream d1=new DataOutputStream(S.getOutputStream());
S1=bin.readLine();
System.out.println("The Recieved message from the client is");
System.out.println(S1);
}
}
}
CLIENT SIDE PROGRAM
import java.io.*;
import java.net.*;
public class ChatClient
{
public static void main(String args[])throws UnknownHostException,IOException
{
String sin,sout;
System.out.println("Enter a message to be send to the server: ");
BufferedReader bclient=new BufferedReader(new InputStreamReader(System.in));
sin=bclient.readLine();
Socket s=new Socket("10.10.1.85",1001);
DataOutputStream dos=new DataOutputStream(s.getOutputStream());
dos.writeBytes(sin+'\n');
s.close();
}
}
;10
Q 5: WAP to design a client server application to implement one way chatting.
[SCREENSHOTS]
Client Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> javac p5_client.java D:\Java\jdk1.6.0_30\bin\0NETWORKING> java p5_client Enter a message to be send to the server: Hello Mr. How you doing?
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> javac p5_server.java D:\Java\jdk1.6.0_30\bin\0NETWORKING> java p5_server Receiving Message from the client... The Recieved message from the client is Hello Mr. How you doing?
;11
Q 6: Write a program to create a client server application for sharing system date and time.
[SOURCE CODE]
SERVER SIDE PROGRAM
import java.net.*;
import java.io.*;
import java.util.*;
class p6_server
{
public static void main(String args[]) throws Exception,UnknownHostException
{
ServerSocket s=new ServerSocket(5217);
while(true)
{
System.out.println("Waiting For Connection ...");
Socket soc=s.accept();
DataOutputStream out=new DataOutputStream(soc.getOutputStream());
out.writeBytes("Client This is my Date and time:");
out.writeBytes((new Date()).toString() + "\n");
BufferedReader in=new BufferedReader(new InputStreamReader(soc.getInputStream()));
System.out.println(in.readLine());
soc.close();
}
}
}
CLIENT SIDE PROGRAM
import java.io.*;
import java.net.*;
import java.util.*;
class p6_client
{
public static void main(String args[]) throws Exception,UnknownHostException
{
Socket soc=new Socket(InetAddress.getLocalHost(),5217);
BufferedReader in=new BufferedReader(new InputStreamReader(soc.getInputStream()));
System.out.println(in.readLine());
DataOutputStream out=new DataOutputStream(soc.getOutputStream());
out.writeBytes("Server This is my Date And Time:" );
out.writeBytes((new Date()).toString() + "\n");
}
}
;12
Q 6: Write a program to create a client server application for sharing system date and time.
[SCREENSHOTS]
Client Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING>javac p6_client.java D:\Java\jdk1.6.0_30\bin\0NETWORKING>java p6_client Client This is my Date and time:Mon Mar 25 22:15:37 IST 2013
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING>javac p6_server.java D:\Java\jdk1.6.0_30\bin\0NETWORKING>java p6_server Waiting For Connection ... Server This is my Date And Time:Mon Mar 25 22:15:37 IST 2013 Waiting For Connection ...
;13
Q 7: Write a program to create a chat server that connects two clients that communicate with server using different ports.
[SOURCE CODE]
SERVER SIDE PROGRAM
import java.io.*;
import java.net.*;
public class multiserver1 implements Runnable
{
ServerSocket ss1,ss2;
DataOutputStream S2c1,S2c2;
BufferedReader sfc1,sfc2;
Thread thread;
Socket s1,s2;
String s11,s12;
public multiserver1()
{
try
{
ss1=new ServerSocket(1001);
ss2=new ServerSocket(1002);
}
catch(Exception e)
{
System.out.print(e);
}
thread=new Thread(this);
thread.start();
}
public void run()
{
try
{
System.out.println("Listening mode...");
while(true)
{
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
s1=ss1.accept();
s2=ss2.accept();
sfc1=new BufferedReader(new
InputStreamReader(s1.getInputStream()));
sfc2=new BufferedReader(new
InputStreamReader(s2.getInputStream()));
System.out.println(sfc1.readLine());
System.out.println(sfc2.readLine());
S2c1=new DataOutputStream(s1.getOutputStream());
S2c2=new DataOutputStream(s2.getOutputStream());
System.out.println("data to be sent to client 1");
s11=in.readLine();
System.out.println("data to be sent to client 2");
s12=in.readLine();
S2c1.writeBytes(s11+'\n');
S2c2.writeBytes(s12+'\n');
;14
}
}
catch(Exception e)
{
System.out.print(e);
}
finally
{
try
{
s1.close();
s2.close();
}
catch(Exception e)
{
System.out.print(e);
}
}
}
public static void main(String args[])throws IOException,UnknownHostException
{
new multiserver1();
}
}
CLIENT SIDE PROGRAM
import java.io.*;
import java.net.*;
public class multiClient1
{
DataOutputStream StreamToServer;
BufferedReader StreamFromServer;
public multiClient1()
{
while(true)
{
try
{
String s;
Socket toServer=new Socket("10.10.0.114",1001);
StreamToServer=new
DataOutputStream(toServer.getOutputStream());
System.out.println("\n:1:");
BufferedReader r=new BufferedReader(new
InputStreamReader(System.in));
s=r.readLine();
StreamToServer.writeBytes(s+"\n");
StreamFromServer=new BufferedReader(new
InputStreamReader(toServer.getInputStream()));
String str=StreamFromServer.readLine();
System.out.println("\n:2:"+str);
}
catch(Exception e)
{
System.out.println(e);
}
}
}
;15
public static void main(String args[])throws IOException,UnknownHostException
{
new multiClient1();
}
}
CLIENT SIDE PROGRAM 2
import java.io.*;
import java.net.*;
public class multiClient2
{
DataOutputStream StreamToServer;
BufferedReader StreamFromServer;
public multiClient2()
{
while(true)
{
try
{
String s;
Socket toServer=new Socket("10.10.0.114",1002);
StreamToServer=new
DataOutputStream(toServer.getOutputStream());
System.out.println("\n:1:");
BufferedReader r=new BufferedReader(new
InputStreamReader(System.in));
s=r.readLine();
StreamToServer.writeBytes(s+"\n");
StreamFromServer=new BufferedReader(new
InputStreamReader(toServer.getInputStream()));
String str=StreamFromServer.readLine();
System.out.println("\n:2:"+str);
}
catch(Exception e)
{
System.out.println(e);
}
}
}
public static void main(String args[])throws IOException,UnknownHostException
{
new multiClient2();
}
}
;16
Q 7: Write a program to create a chat server that connects two clients that communicate with server using different ports.
[SCREENSHOTS]
Client Side 1: D:\Java\jdk1.6.0_30\bin\0NETWORKING> java multiClient2 :1: Bob here :2: hi! Mathew :1:
Client Side 2: D:\Java\jdk1.6.0_30\bin\0NETWORKING> java multiClient1 :1: Mathew here :2: hi! Bob :1:
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING>java multiserver1 Listening mode… Bob here Mathew here data to be sent to client 1 hi! Bob data to be sent to client 2 hi! Mathew
;17
Q 8: Write a program to create a client server application to send the encrypted data from the client and then decrypting it at the server end.
[SOURCE CODE]
SERVER SIDE PROGRAM
import java.io.*;
import java.net.*;
public class server
{
public static void main(String args[])throws IOException,UnknownHostException
{
String s3="",s2;
char c;
int i;
ServerSocket SS=new ServerSocket(1001);
System.out.println("\nListening Mode....");
while(true)
{
Socket S=SS.accept();
BufferedReader bin=new BufferedReader(new
InputStreamReader(S.getInputStream()));
DataOutputStream d1=new DataOutputStream(S.getOutputStream());
s2=bin.readLine();
System.out.println("Encrypted String is:" +s2);
for(i=0;i<s2.length();i++)
{
c=(char)(s2.charAt(i)-3);
s3=s3+c;
}
System.out.println("Decrypted string is:"+ s3);
}
}
}
;18
CLIENT SIDE PROGRAM
import java.io.*;
import java.net.*;
class client
{
public static void main(String args[])throws UnknownHostException,IOException
{
String s1="",sin;
char c;
int i;
System.out.println("Enter String ");
BufferedReader bclient=new BufferedReader(new InputStreamReader(System.in));
sin=bclient.readLine();
for(i=0;i<sin.length();i++)
{
c=(char)(sin.charAt(i)+3);
s1=s1+c;
}
Socket s=new Socket("LocalHost",1001);
DataOutputStream dos=new DataOutputStream(s.getOutputStream());
dos.writeBytes(s1+'\n');
s.close();
}
}
;19
Q 8: Write a program to create a client server application to send the encrypted data from the client and then decrypting it at the server end.
[SCREENSHOTS]
Client Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING>java client Enter String Bob
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING>java server Listening Mode… Encrypted string is: Ohlo Decrypted string is: Bob
;20
Q 9: Write a program to implement two way chatting between client and server.
[SOURCE CODE]
CLIENT SIDE PROGRAM
import java.io.*;
import java.net.*;
public class GossipClient
{
public static void main(String[] args) throws Exception
{
Socket sock = new Socket("127.0.0.1", 3000);
BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
OutputStream ostream = sock.getOutputStream();
PrintWriter pwrite = new PrintWriter(ostream, true);
InputStream istream = sock.getInputStream();
BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));
System.out.println("Start the chitchat, type and press Enter key");
String receiveMessage, sendMessage;
while(true)
{
sendMessage = keyRead.readLine(); // keyboard reading
pwrite.println(sendMessage); // sending to server
System.out.flush(); // flush the data
if((receiveMessage = receiveRead.readLine()) != null) //receive from server
{
System.out.println(receiveMessage); // displaying at DOS prompt
}
}
}
}
;21
SERVER SIDE PROGRAM
import java.io.*;
import java.net.*;
public class GossipServer
{
public static void main(String[] args) throws Exception
{
ServerSocket sersock = new ServerSocket(3000);
System.out.println("Server ready for chatting");
Socket sock = sersock.accept( );
BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
OutputStream ostream = sock.getOutputStream();
PrintWriter pwrite = new PrintWriter(ostream, true);
InputStream istream = sock.getInputStream();
BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));
String receiveMessage, sendMessage;
while(true)
{
if((receiveMessage = receiveRead.readLine( )) != null)
{
System.out.println(receiveMessage);
}
sendMessage = keyRead.readLine();
pwrite.println(sendMessage);
System.out.flush();
}
}
}
;22
Q 9: Write a program to implement two way chatting between client and server.
[SCREENSHOTS]
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> java GossipServer Server ready for chatting Bob here! Hi! Bob What are you doing? Nothing…
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> java GossipClient Start the chitchat, type and press Enter key Bob here! Hi! Bob What are you doing?
;23
Q 10: Write a program for securely exchanging key between server and the client without sharing the private data.
[SOURCE CODE]
CLIENT SIDE PROGRAM
import java.net.*;
import java.io.*;
import java.math.*;
import java.lang.Integer;
public class KeyClient
{
private double a;
public double p,g;
double interResult()
{
return (Math.pow( g,a ))% p;
}
double result(double s)
{
return (Math.pow(s,a)) %p;
}
KeyClient(double l,double m, double n)
{
a=l;
p=m;
g=n;
}
public static void main(String args[]) throws Exception
{
KeyClient k=new KeyClient(6.0,23.0,5.0);
String s1="",s2="";
int ir=(int)(k.interResult()),fr;
System.out.println("Shared value = "+ir);
Socket s= new Socket("LocalHost",1400);
BufferedReader br= new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintStream dos=new PrintStream(s.getOutputStream());
System.out.println(s1);
dos.println(ir);
s2=br.readLine();
int r=Integer.parseInt(s2);
fr=(int)(k.result(r));
System.out.println("Final result = "+fr);
}
}
;24
SERVER SIDE PROGRAM
import java.net.*;
import java.io.*;
import java.math.*;
import java.lang.Integer;
public class KeyServer
{
private int b;
public int pb,gb;
int interResult()
{
return ((int)Math.pow(gb,b))%pb;
}
int result(int s)
{
return ((int)Math.pow(s,b))%pb;
}
KeyServer(int l,int m, int n)
{
b=l;
pb=m;
gb=n;
}
public static void main(String args[]) throws Exception
{
KeyServer ks=new KeyServer(4,23,5);
String s1="",s2="";
int ir=(int)(ks.interResult());
int fr=0;
System.out.println("Shared value = "+ir);
ServerSocket ss= new ServerSocket(1400);
Socket s=ss.accept();
BufferedReader br= new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintStream dos=new PrintStream(s.getOutputStream());
System.out.println(s1);
dos.println(ir);
s2=br.readLine();
int r=Integer.parseInt(s2);
fr=(int)(ks.result(r));
System.out.println("Final result = "+fr);
s.close();
}
}
;25
Q 10: Write a program for securely exchanging key between server and the client without sharing the private data.
[SCREENSHOTS]
Server Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> java KeyServer Shared value = 4 Final result = 2
Client Side: D:\Java\jdk1.6.0_30\bin\0NETWORKING> java KeyClient Shared value = 8 Final result = 2