Advance Networking Lab File
Submitted to: Submitted By:
Ms. Anu Gupta Gaurav Mishra
A2305207151
Roll No – 544
Sec-6CS3
Batch - 2007-11
INDEX
S. No. Description Date Signature
1. Write a program to obtain a character through keyboard using buffered
reader object.
import java.io.*;
public class test
{
public static void main(String args[]) throws IOException
{
InputStreamReader ip=new InputStreamReader(System.in);
BufferedReader ob=new BufferedReader(ip);
System.out.println("enter a character");
char c=(char)ob.read();
System.out.println("you have entered "+c);
}
}
Output:
D:\jdk\bin>javac test.java
D:\jdk\bin>java test
enter a character
s
You have entered s
2. Write a program to obtain a string through keyboard using buffered
reader object.
import java.io.*;
public class test2
{
public static void main(String args[]) throws IOException
{
InputStreamReader ip=new InputStreamReader(System.in);
BufferedReader ob=new BufferedReader(ip);
System.out.println("enter the string");
String c=ob.readLine();
System.out.println("you have entered "+c);
}
}
Output:
D:\jdk\bin>javac test2.java
D:\jdk\bin>java test2
enter the string
java
you have entered java
3. Write a program to find out which of the first 1024 ports seem to be
hosting on a specified host.
import java.net.*;
import java.io.*;
public class soctest
{
public static void main(String args[]) throws UnknownHostException
{
String host="local host";
for(int i=0;i<=1024;i++)
{
try
{
Socket s=new Socket(host,i);
System.out.println(host+"port number "+i);
}
catch(Exception e)
{ System.out.println("exception occured "+e);
}
}
}
}
Output:
D:\jdk\bin>javac soctest.java
D:\jdk\bin>java soctest
exception occurred java.net.UnknownHostException: local host
4. Write a program to print the address and name of the local machine and
those of two well-known websites.
import java.net.*;
class InetAddressTest
{
public static void main(String args[]) throws
UnknownHostException {
InetAddress Address = InetAddress.getLocalHost();
System.out.println(Address);
Address = InetAddress.getByName("www.timesofindia.com");
System.out.println(Address);
InetAddress SW[] = InetAddress.getAllByName("www.espnstar.com");
for (int i=0; i<SW.length; i++)
System.out.println(SW[i]);
}
}
Output:
D:\jdk\bin>javac InetAddressTest.java
D:\jdk\bin>java InetAddressTest
User-PC/10.0.125.165
www.timesofindia.com/203.199.93.69
www.espnstar.com/210.212.26.24
www.espnstar.com/210.212.26.19
5.Write a program to implement one-way chatting.
Client
import java.net.*;
import java.io.*;
class client1way
{
static void p(String s)
{
System.out.println(s);
}
public static void main(String args[]) throws IOException, UnknownHostException
{
String s1,s2;
Socket s = new Socket("localhost",1010);
BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
DataOutputStream ds1 = new DataOutputStream(s.getOutputStream());
p("Say something");
s1 = br1.readLine();
ds1.writeBytes(s1 + '\n');
}
}
Server
import java.net.*;
import java.io.*;
class server1way
{
static void p(String s)
{
System.out.println(s);
}
public static void main(String args[]) throws IOException,UnknownHostException
{
String s2;
ServerSocket ss = new ServerSocket(1010);
while(true)
{
Socket s = ss.accept();
BufferedReader br1 = new BufferedReader(new
InputStreamReader(s.getInputStream()));
s2 = br1.readLine();
p("Friend Says");
p(s2);
}
}
}
Output:
6. Write a program to implement two-way chatting.
Client
import java.io.*;
import java.net.*;
class client2way
{
static void p(String s)
{
System.out.println(s);
}
public static void main(String args[])throws IOException,UnknownHostException
{
String s1,s2;
Socket s=new Socket("Localhost",1010);
//this line will execute only if there is a socket at client sid
BufferedReader bclient=new BufferedReader(new InputStreamReader(System.in)); //input
from client side
DataOutputStream dos=new DataOutputStream(s.getOutputStream()); //out from client
to server i.e request
p("say something....");
s1=bclient.readLine(); //to read from client end
dos.writeBytes(s1+'\n');
while(true)
{
BufferedReader br=new BufferedReader(new
InputStreamReader(s.getInputStream())); //in from client
s2=br.readLine(); //to read from client end
p("friend says");
p(s2);
}}}
Server
import java.io.*;
import java.net.*;
class server2way
{
static void p(String s)
{
System.out.println(s);
}
public static void main(String args[])throws IOException,UnknownHostException
{
String s1,s2;
ServerSocket ss=new ServerSocket(1010);
while(true)
{
Socket s=ss.accept();
BufferedReader br=new BufferedReader(new
InputStreamReader(s.getInputStream())); //in from client
s1=br.readLine(); //to read from client end
p("friend says");
p(s1);
BufferedReader bclient=new BufferedReader(new InputStreamReader(System.in)); //input
from client side
DataOutputStream dos=new DataOutputStream(s.getOutputStream()); //out from client
to server i.e request
p("say something....");
s2=bclient.readLine(); //to read from client end
dos.writeBytes(s2+'\n');
}}
}
Output:
7. Program to convert a lowercase string into uppercase string using Socket
programming.
Myserver45.java
import java.lang.*;
import java.net.*;
import java.io.*;
class myserver45
{
static void p (String s)
{ System.out.println(s);
}
public static void main (String args[])throws IOException,UnknownHostException
{
String s1,s2;
ServerSocket ss=new ServerSocket(1001);
Socket s= ss.accept();
BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream dos1= new DataOutputStream(s.getOutputStream());
s1=br.readLine();
p("friend says");
p(s1);
s2=s1.toUpperCase();
dos1.writeBytes(s2+'\n');
}
}
Myclient45.java
import java.io.*;
import java.net.*;
public class myclient45
{
public static void main(String args[]) throws IOException,UnknownHostException
{
String sin,sout;
Socket s= new Socket("localhost",1001);
BufferedReader bclient= new BufferedReader(new InputStreamReader(System.in));
DataOutputStream dos= new DataOutputStream(s.getOutputStream());
BufferedReader bserver= new BufferedReader(new
InputStreamReader(s.getInputStream()));
System.out.print("enter string: ");
sin=bclient.readLine();
dos.writeBytes(sin+"\n");
sout=bserver.readLine();
System.out.println(sout);
s.close();
}
}
OUTPUT:-
Serverside:-
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\amity>cd\
C:\>cd pro*\java\jd*\bin
C:\Program Files\Java\jdk1.6.0_18\bin>javac myclient45.java
C:\Program Files\Java\jdk1.6.0_18\bin>javac myserver45.java
C:\Program Files\Java\jdk1.6.0_18\bin>java myserver45
friend says
gaurav mittal
Client side:-
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\amity>cd\
C:\>cd pro*\java\jd*\bin
C:\Program Files\Java\jdk1.6.0_18\bin>java myclient45
enter string: gaurav mittal
GAURAV MITTAL
8. Program to get date and time from server side.
Client side:-
import java.io.*;
import java.net.*;
import java.util.*;
class DateClient
{
static void p(String s)
{
System.out.println(s);
}
public static void main(String args[])throws IOException,UnknownHostException
{
String s1,s2;
Socket s=new Socket("Localhost",1331);
//this line will execute only if there is a socket at client side
BufferedReader bclient=new BufferedReader(new InputStreamReader(System.in));
//input from client side
DataOutputStream dos=new DataOutputStream(s.getOutputStream());
//out from client to server i.e request
p("TO get date and time from server.");
p("Give a command for Date");
s1=bclient.readLine(); //to read from client end
dos.writeBytes(s1+'\n');
BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
//in from server to client
s2=br.readLine(); //to read from Server End
p("Server side Returns:-");
p(s2);
s.close();
}
}
Server side:-
import java.io.*;
import java.net.*;
import java.util.*;
class DateServer
{
static void p(String s)
{
System.out.println(s);
}
public static void main(String args[])throws IOException,UnknownHostException
{
String s1,s2;
ServerSocket ss=new ServerSocket(1331);
Date d1=new Date();
while(true)
{
Socket s=ss.accept();
BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
s1=br.readLine(); //to read from client end
p("Input From Client Side :-");
p(s1);
DataOutputStream dos=new DataOutputStream(s.getOutputStream());
if(s1.equalsIgnoreCase("DATE"))
{
s2=d1.toString(); //to read from client end
dos.writeBytes(s2+'\n');
}
else
{ s2="Not a Command!!!!!";
dos.writeBytes(s2+'\n');
}
}
}
}
OUTPUT:-
9. Program to encrypt a message at client side and decrypt it in server side.
Client side:-
import java.io.*;
import java.net.*;
class LocalClient
{
public static void main(String args[])throws UnknownHostException,IOException
{
String sin,sout,s2="";
char ch;
System.out.println("Enter message : ");
BufferedReader bclient=new BufferedReader(new InputStreamReader(System.in));
sin=bclient.readLine();
for(int i=0;i<sin.length();i++)
{
ch=(char)(sin.charAt(i)+3);
s2=s2+ch;
}
Socket s=new Socket("LocalHost",1001);
DataOutputStream dos=new DataOutputStream(s.getOutputStream());
dos.writeBytes(s2+'\n');
s.close();
}
}
Server side:-
import java.io.*;
import java.net.*;
public class LocalServer
{
public static void main(String args[])throws IOException,UnknownHostException
{
try
{
String s1,s2="";
char ch;
ServerSocket SS=new ServerSocket(1001);
System.out.println("\nListening Mode....");
while(true)
{
Socket S=SS.accept();
BufferedReader bin=new BufferedReader(new
InputStreamReader(S.getInputStream()));
s1=bin.readLine();
System.out.println("encrypted message is "+s1);
for(int i=0;i<s1.length();i++)
{ ch=(char)(s1.charAt(i)-3);
s2=s2+ch;
}
System.out.println("decrypted message is "+s2);
}
}
catch(Exception e)
{ }
}
}
Output:-
