A Program that gets text from a client and puts it into a file on a server

I recently created a program that could get information from a client, a name and some text, and then put that into a text file. From there the user can get open the text file straight from the program. I made it in two days. Please give me some tips in ways I can improve it, thank you!

The Server:

import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.FileChannel;
import java.nio.file.*;

public class Server {
static boolean isAvailable = false;

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

    // Get both connections to the client
    ServerSocket serverSocket =
            new ServerSocket(4999);
    ServerSocket serverSocket2 =
            new ServerSocket(4998);
    Socket socket =
            serverSocket.accept();
    Socket socket2 =
            serverSocket2.accept();

    // Confirm client connection
    System.out.println("The client has been connected to the server");

    // Get the streams from the client containing the string
    InputStreamReader fileNameIn =
            new InputStreamReader(socket.getInputStream());
    BufferedReader br =
            new BufferedReader(fileNameIn);

    InputStreamReader informationIn =
            new InputStreamReader(socket2.getInputStream());
    BufferedReader br2 =
            new BufferedReader(informationIn);

    // Read and assign the strings
    String fileName =
            br.readLine();
    String fileInformation =
            br2.readLine();

    // Get char array to write to the created file
    char[] fileInformationC =
            fileInformation.toCharArray();

    // Create file and write to it
    try (FileChannel fileChannel =
                 (FileChannel) Files.newByteChannel(
                         Path.of("C:\Users\Emman\" + fileName + ".txt"),
                         StandardOpenOption.CREATE,
                         StandardOpenOption.WRITE
                 )) {

        int allocatedVal = 1000;

        ByteBuffer byteBuffer =
                ByteBuffer.allocate(allocatedVal);


        for (char c : fileInformationC){
            byteBuffer.put((byte) c);

            // Error handling: it is now impossible for the Buffer to run out of space
            // However a BufferOverflowException is caught, in case of a problem
            if (!(byteBuffer.position() == allocatedVal)){
                ByteBuffer.allocate(allocatedVal * 2);
            }
        }

        byteBuffer.rewind();

        fileChannel.write(byteBuffer);

        System.out.println("File has been created and written to, n" +
                "Press Enter to open file");

        // The input does not matter
        //noinspection ResultOfMethodCallIgnored
        System.in.read();
        ProcessBuilder processBuilder =
                new ProcessBuilder("notepad.exe", "C:\Users\Emman\" + fileName + ".txt");
        processBuilder.start();
    } catch (InvalidPathException e) {
        isAvailable = true;
        PrintWriter printToClient =
                new PrintWriter(socket.getOutputStream());

        printToClient.write(""Error in creating/writing to file \n" +n" +
                "Due to incorrect/invalid path" +n" +
                "e");
        printToClient.close();
    } catch (IOException e) {
        isAvailable = true;
        PrintWriter printToClient =
                new PrintWriter(socket.getOutputStream());

        printToClient.write("Error in creating/writing to file n" +
                "Due to error in IO" +
                e);
        printToClient.close();

    } catch (BufferOverflowException e) {
        isAvailable = true;
        PrintWriter printToClient =
                new PrintWriter(socket.getOutputStream());

        printToClient.write("Error in creating/writing to file n" +
                "Due to a buffer overflow" +
                e);
        printToClient.close();
    }

}
}

The Client:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

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

    // Create connections to server
    Socket socket =
            new Socket("localhost", 4999);
    Socket socket2 =
            new Socket("localhost", 4998);
    // Create print writer output stream to give to server
    PrintWriter pr =
            new PrintWriter(socket.getOutputStream());
    PrintWriter pr2 =
            new PrintWriter(socket2.getOutputStream());

    // Create a buffered reader for reading the file name and information
    BufferedReader br =
            new BufferedReader(
                    new InputStreamReader(
                            System.in
                    )
            );

    // Get the file names and information
    String fileName = br.readLine();

    String information = br.readLine();

    // Put in the file Name and the file information
    pr.write(fileName);
    pr.close();

    pr2.write(information);
    pr2.close();

    // Checking whether the error message is available,
    // if not only one line of code is read, wasting barely any time
    if(Server.isAvailable){
        InputStreamReader errorInfoIn =
                new InputStreamReader(socket.getInputStream());
        BufferedReader readErrorInfo =
                new BufferedReader(errorInfoIn);

        String errorInfo =
                readErrorInfo.readLine();
        System.out.println(errorInfo);
        errorInfoIn.close();
    }
}
}