Hi, I need your help to write online user input into text file on hosting apache tomcat server.

package test;

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

public class TestServerSocket {

public static void main(String args[]) throws IOException {
final int portNumber = 81;
System.out.println("Creating server socket on port " + portNumber);
ServerSocket serverSocket = new ServerSocket(portNumber);
while (true) {
Socket socket = serverSocket.accept();
OutputStream os = socket.getOutputStream();
PrintWriter pw = new PrintWriter(os, true);
pw.println("What's you name?");

BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String str = br.readLine();

pw.println("Hello, " + str);
pw.close();
socket.close();

System.out.println("Just said hello to:" + str);
}
}
}