Чтение параметров выражения из файла и запись результата в новый файл

import java.io.*;
import java.net.Socket;
import java.util.Scanner;
public class Client {
 
    public static int strNumber;
    public static int a;
    public static int b;
    public static int c;
    public static int d;
    public static int x1;
 
    public static final int PACKAGE_SIZE = 1048576;
 
public static void Ura(String fName, String fileName) {
        try{
            Scanner sc = new Scanner(new File(fName));
            while(sc.hasNext()) {
                a = sc.nextInt();
                b = sc.nextInt();
                c = sc.nextInt();
                sc.close();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        x1 = a+b+c;
        try{
             new File(fName);
            BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(fName));
            bufferedWriter.write(x1);
            bufferedWriter.write("\n");
            bufferedWriter.close();
        }
catch(Exception e){
    e.printStackTrace();
}
    }
 
    
    public static void main(String args[]) throws IOException {
 
        Scanner scanner = new Scanner(System.in);
        System.out.print("IP:   ");
        String ip = scanner.next();
        System.out.print("Port: ");
        String port = scanner.next();
        Socket socket = null;
        try{
        socket = new Socket(ip, Integer.valueOf(port));
 
        DataInputStream dataInputStream = new DataInputStream(socket.getInputStream());
        String fileName = "";
        fileName = dataInputStream.readUTF();
 
        DataOutputStream dataOutputStream = new DataOutputStream(new FileOutputStream(fileName));
        boolean flag = true;
        int numberOfBytes = PACKAGE_SIZE;
        byte[] bytes = new byte[numberOfBytes];
        while (numberOfBytes > 1) {
            numberOfBytes = dataInputStream.read(bytes,0,numberOfBytes);
            flag = numberOfBytes > 1;
            if (flag) {
                dataOutputStream.write(bytes,0,numberOfBytes);
                System.out.println(numberOfBytes + " Bytes were received");
            } else flag = false;
        }System.out.println("All data have been sent");//все данные посланы
 
        String fName = "H:/f_" + System.currentTimeMillis() + ".txt";
 
        Ura(fileName,fName);
 
        dataOutputStream = new DataOutputStream(socket.getOutputStream());
        dataOutputStream.write(1);
        dataOutputStream.writeUTF(fName);
        dataInputStream = new DataInputStream(new FileInputStream(fName));
        numberOfBytes = PACKAGE_SIZE;
        flag = true;
        bytes = new byte[numberOfBytes];
        while (flag) {
            numberOfBytes = dataInputStream.read(bytes,0,numberOfBytes);
            flag = numberOfBytes != -1;
            if (flag) {
                dataOutputStream.write(bytes,0,numberOfBytes);
                System.out.println(numberOfBytes + " Bytes were send");
            }
        }
        long time = System.currentTimeMillis();
        long time1 = 2000 + time;
        while (time < time1){
            time = System.currentTimeMillis();
        }
        dataOutputStream.write(1);
        System.out.println("Work is completed ");//Работа завершена
        socket.close();
        dataInputStream.close();
        dataOutputStream.close();
        scanner.close();
        }catch (IOException e){
            System.out.println("Connection with a server is lost");//Соединение с сервером потеряно
            socket.close();
        }
    }
 
}