Client.java

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.*;

public class Client {
   Socket socket;
   String DELIMITER_FOR_FILES = "\\w*(?=\\.)";

   public Client() {

   }

   public void connect(String fName, String host, int port) {
      try {
         socket = new Socket(host, port);
         File myFile = new File(fName);
         BufferedInputStream bis = new BufferedInputStream(new FileInputStream(
               myFile));
         byte[] mByteArray = new byte[(int) myFile.length()];
         System.out.println(mByteArray.length);
         bis.read(mByteArray, 0, mByteArray.length);
         DataOutputStream os = new DataOutputStream(new BufferedOutputStream(
               socket.getOutputStream()));
         // header for size of file
         os.writeLong(myFile.length());
         os.write(mByteArray, 0, mByteArray.length);
         os.flush();
         String destination = (fName.split(DELIMITER_FOR_FILES))[0] + ".xml";
         acceptFile(destination, host, port);
         // While there's still something inside of the BufferedReader
      } catch (Exception e) {
         System.out.println("could not connect");
         e.printStackTrace();
      }
   }

   public void acceptFile(String fileDestination, String host, int port) {
      try {
         DataInputStream dis = new DataInputStream(new BufferedInputStream(
               socket.getInputStream()));
         FileOutputStream fos = new FileOutputStream(new File(fileDestination));
         BufferedOutputStream bos = new BufferedOutputStream(fos);
         int bytesToRead = (int) dis.readLong();
         byte[] bytearray = new byte[bytesToRead];
         dis.read(bytearray, 0, bytearray.length);
         bos.write(bytearray, 0, bytesToRead);
         bos.flush();
         bos.close();
         socket.close();
      } catch (Exception e) {
         System.out.println("trouble receiving io file");
      }
   }
}

ClientTester.java

public class ClientTester {
   public static void main(String[] args){
      Client client = new Client();
      client.connect("Restaurants.csv", "127.0.0.1", 1234);
      
   }
}