4-TCPS.java

// Using TCP/IP sockets, write a client – server program to make the client send the file name and to make the server send back the contents of the requested file if present.

import java.util.*;
import java.net.*;
import java.io.*;

public class TCPS{
	public static void main(String[] args) throws Exception{
		
		ServerSocket sersock=new ServerSocket(4000);
		System.out.println("Server is ready for connection");
		
		Socket sock=sersock.accept();
		System.out.println("Connection is established and server is waiting for client request");
		
		InputStream istream=sock.getInputStream();
		BufferedReader fileRead=new BufferedReader(new InputStreamReader(istream));
		String fname=fileRead.readLine();
		
		BufferedReader contentRead=new BufferedReader(new FileReader(fname));
		
		OutputStream ostream=sock.getOutputStream();
		PrintWriter pwrite=new PrintWriter(ostream,true);
		
		String str;
		while((str=contentRead.readLine())!=null){
			pwrite.println(str);
		}
		
		sersock.close();
		sock.close();
		fileRead.close();
		contentRead.close();
		pwrite.close();
		
		System.out.println("Client request fulfilled");
	}
}