1. To develop any distributed application through implementing client-server communication programs based on Java Sockets and RMI techniques.
/*Assignment No:-01
Title: Design a distributed application which consist of a
server and client using threads.
*/
//MyClient.java
import java.net.*;
import java.io.*;
public class MyClient
{
public static void main (String args[])
{
int n,ch,ch1,fact;
String st,st1,st2,first,last;
try
{
Socket s = new Socket(args[0], 2001);
DataInputStream in = new DataInputStream( s.getInputStream());
DataOutputStream out =new DataOutputStream( s.getOutputStream());
BufferedReader object = new BufferedReader(new InputStreamReader(System.in));
do
{
System.out.println("1.Factorial\n2.Adddition of digits\n3.String operations\n4.Exit\nEnter ur choice:");
ch= Integer.parseInt(object.readLine());
out.writeUTF(Integer.toString(ch));
switch(ch)
{
case 1:
System.out.println("Enter a number=");
n=Integer.parseInt(object.readLine());
out.writeUTF(Integer.toString(n));
fact=Integer.parseInt(in.readUTF());
System.out.println("Factorial of "+n+"is "+fact) ;
break;
case 2:
System.out.println("Enter a number");
n=Integer.parseInt(object.readLine());
out.writeUTF(Integer.toString(n));
int sum=Integer.parseInt(in.readUTF());
System.out.println("Addition of digits of "+n+" is "+sum) ;
break;
case 3:
do
{
System.out.println("1.concatenation\n2.substring\n3.palindrome \n4.Exit\nEnter ur choice:");
ch1=Integer.parseInt(object.readLine());
out.writeUTF(Integer.toString(ch1));
switch(ch1)
{
case 1:
System.out.println("Enter First string");
st1=object.readLine();
out.writeUTF(st1);
System.out.println("Enter second string");
st2=object.readLine();
out.writeUTF(st2);
st=in.readUTF();
System.out.println("Concatenated String of "+st1+" and "+st2+"is :: "+st) ;
break;
case 2:
System.out.println("Enter The string");
st1=object.readLine();
out.writeUTF(st1);
System.out.println("Enter The Start Position of the substring");
first=object.readLine();
out.writeUTF(first);
System.out.println("Enter The end Position of the substring");
last=object.readLine();
out.writeUTF(last);
st=in.readUTF();
System.out.println("Substring of string "+st1+" is :: "+st) ;
break;
case 3:
System.out.println("Enter The string");
st=object.readLine();
out.writeUTF(st);
n=Integer.parseInt(in.readUTF());
if(n==0)
System.out.println("string"+st+" is Palindrome") ;
else
System.out.println("string"+st+" is not Palindrome") ;
break;
}
}while(ch1>0 && ch1!=4);
break;
case 4:
System.exit(0);
break;
}
}while(ch>0);
}
catch (Exception e)
{
System.out.println("Exception:"+e.getMessage());
}
}
}
//MyServer.java
import java.net.*;
import java.io.*;
public class MyServer extends Thread
{
DataInputStream in;
DataOutputStream out;
Socket clientSocket;
int n,ch,ch1,f,l;
String st,st1,st2;
public MyServer()
{
try
{
ServerSocket listenSocket = new ServerSocket(2001);
System.out.println("\nServer is Running") ;
clientSocket = listenSocket.accept();
System.out.println("\n Client is Connected") ;
in = new DataInputStream( clientSocket.getInputStream());
out =new DataOutputStream( clientSocket.getOutputStream());
this.start();
}
catch(IOException e)
{
System.out.println("Connection:"+e.getMessage());
}
}
public void run()
{
try
{
while(true)
{
ch =Integer.parseInt(in.readUTF());
switch(ch)
{
case 1:
int fact= 1;
n =Integer.parseInt(in.readUTF());
for (int i= 1; i<=n; i++)
{
fact=fact*i;
}
out.writeUTF(Integer.toString(fact));
break;
case 2:
int sum=0,rem;
n =Integer.parseInt(in.readUTF());
while(n!=0)
{
rem = n%10;
n = n/10;
sum=sum + rem;
}
out.writeUTF(Integer.toString(sum));
break;
case 3:
while(true)
{
ch1 =Integer.parseInt(in.readUTF());
switch(ch1)
{
case 1:
st1=in.readUTF();
st2=in.readUTF();
st=st1.concat(st2);
out.writeUTF(st);
break;
case 2:
st1=in.readUTF();
f =Integer.parseInt(in.readUTF());
l =Integer.parseInt(in.readUTF());
st=st1.substring(f,l);
out.writeUTF(st);
st=null;
break;
case 3:
st=in.readUTF();
st1 = new StringBuffer(st).reverse().toString();
n=st.compareTo(st1);
out.writeUTF(Integer.toString(n));
break;
}
}
}
}
}
catch (Exception e)
{
System.out.println("Exception :"+e.getMessage());
}
}
public static void main (String args[])
{
try
{
MyServer s=new MyServer();
}
catch(Exception e)
{
System.out.println("Listen socket:"+e.getMessage());
e.printStackTrace();
}
}
}
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