Slip 17 - B) Write a Java program to check whether given file is present on server or not, if it is there then display its contents on client’s terminal otherwise display the message “File Not Found”.

Solution:

//Client code:

import java.io.*;

import java.net.*;

import java.util.*;

 

public class ClientFile

{

                static Scanner sc=new Scanner(System.in);

                public static void main(String args[]) throws IOException

                {

                try

                {

                Socket client=new Socket("localhost",7777);

               

                DataInputStream dis=new DataInputStream(client.getInputStream());

                DataOutputStream dos=new DataOutputStream(client.getOutputStream());

               

                System.out.println("pls enter a file name");

                String cfilename=sc.next();

               

                dos.writeUTF(cfilename);

                                String msg=dis.readUTF();

                               

                                if(msg.equalsIgnoreCase("0"))

                                System.out.println("File does not exists");

                                else

                                System.out.println(msg);

                }

                catch(Exception e){}

               

                }

}

//Server code:

import java.io.*;

import java.net.*;

 

class ServerFile

{

                public static void main(String args[]) throws IOException

                {

                                try

                                {

                ServerSocket server=new ServerSocket(7777);

                Socket s=server.accept();

               

                DataInputStream dis=new DataInputStream(s.getInputStream());

                DataOutputStream dos=new DataOutputStream(s.getOutputStream());

               

                String sfilename=dis.readUTF();

               

                                File file=new File(sfilename);

                               

                                                if(file.exists())

                                                {

                                                FileInputStream fin=new FileInputStream(sfilename);

                                               

                                                int ch;

                                                String fileinfo="";

                                               

                                                                while((ch=fin.read())!=-1)

                                                                {

                                                                fileinfo=fileinfo+(char)ch;

                                                                }

                                                System.out.println(fileinfo);

                                                dos.writeUTF(fileinfo);

                                                }

                                                else

                                                dos.writeUTF("0");

                                }

                catch(Exception e){}

                }

}