Client:
import java.io.*;
import java.net.*;
import java.util.*;
class Clientip
{
public
static void main(String args[])
{
try
{
BufferedReader
in=new BufferedReader(new InputStreamReader(System.in));
Socket
clsct=new Socket("127.0.0.1",139);
DataInputStream
din=new DataInputStream(clsct.getInputStream());
DataOutputStream
dout=new DataOutputStream(clsct.getOutputStream());
System.out.println("Enter
the ip address");
String
str=in.readLine();
dout.writeBytes(str+'\n');
String
str1=din.readLine();
System.out.println("The
IP is of: "+str1);
clsct.close();
}
catch
(Exception e)
{
System.out.println(e);
}
}
}
Server:
import java.io.*;
import java.net.*;
import java.util.*;
class Serverip
{
public
static void main(String args[])
{
try
{
ServerSocket
obj=new ServerSocket(139);
while(true)
{
int
a[]=new int[4];
Socket
obj1=obj.accept();
DataInputStream
din=new DataInputStream(obj1.getInputStream());
DataOutputStream
dout=new DataOutputStream(obj1.getOutputStream());
String
str=din.readLine();
char
c[]=new char[4];
str.getChars(0,3,c,1);
for(int
i=1;i<=3;i++)
{
a[i]=(int)c[i];
a[i]-=48;
}
String
s="Class A";
String
s1="Class B";
String
s2="Class C";
String
s3="Class D";
String
s4="Class E";
if(a[1]==0)
dout.writeBytes(s+'\n');
else
if(a[1]==1)
{
if(a[2]==0||a[2]==1||a[2]==2)
{
if(a[2]==2&&a[3]>7)
dout.writeBytes(s1+'\n');
else
dout.writeBytes(s+'\n');
}
else
if(a[2]>2)
{
if(a[2]==9&&a[3]>1)
dout.writeBytes(s2+'\n');
else
dout.writeBytes(s1+'\n');
}
}
else
if(a[1]==2)
{
if(a[2]==0||a[2]==1||a[2]==2)
{
if(a[2]==2&&a[3]>3)
dout.writeBytes(s3+'\n');
else
dout.writeBytes(s2+'\n');
}
else
if(a[2]==3)
dout.writeBytes(s3+'\n');
else
if(a[2]==4||a[2]==5)
{
if(a[2]==5&&a[3]<=5)
dout.writeBytes(s4+'\n');
else
dout.writeBytes(s4+'\n');
}
}
System.out.println(str);
}
}
catch(Exception
e)
{
System.out.println(e);
}
}
}
Output:
Client
Enter the ip address
165.165.1.34
Server
165.165.1.34
Client
The IP is of: Class B
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