1049: Mainline

You can enhance the servlet introduced in Segment 1048 by adding statements that write information to a file. Note that the new version implements the SingleThreadModel interface, as explained in Segment 1050.

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ProcessCriticFormServlet extends HttpServlet
                                      implements SingleThreadModel { 
 public void doGet (HttpServletRequest request, HttpServletResponse response) 
             throws ServletException, IOException { 
  // Process arguments 
  String title = request.getParameter("title"); 
  String script = request.getParameter("script"); 
  String acting = request.getParameter("acting"); 
  String direction = request.getParameter("direction"); 
  // Writing preparation 
  response.setContentType("text/html"); 
  PrintWriter webWriter = response.getWriter(); 
  // Writing HTML page goes here 
  // File output 
  String user = request.getRemoteUser(); 
  String host = request.getRemoteHost(); 
  FileOutputStream stream  
   = new FileOutputStream("VotingData.txt", true); 
  PrintWriter fileWriter = new PrintWriter(stream);                  
  if (user != null) { 
   fileWriter.println("Voter: " + user + " at " + host); 
  } 
  else {fileWriter.println("Voter at " + host);} 
  fileWriter.println("Evaluated \"" + title + "\" stipulating:"); 
  if(script != null) {fileWriter.println("Script: " + script);} 
  if(acting != null) {fileWriter.println("Acting: " + acting);} 
  if(direction != null) { 
   fileWriter.println("Direction: " + direction); 
  } 
  fileWriter.println(""); 
  fileWriter.flush(); 
  stream.close(); 
}}