// Java Servlet resembling CGI example in COBOL/iX to show diffs

import java.io.*;
import javax.servlet.http.*;

public class JCobCGI extends HttpServlet
{

  static final String myHeader = "<h1>Simple Java Servlet Demo</h1>";
  
  static final String myFooter = "<address>Lars Appel, February 1999</address>";


  // this method is invoked for http GET requests

  public void doGet( HttpServletRequest req, HttpServletResponse res )
    throws IOException
  {
    res.setContentType( "text/html" );

    PrintWriter toClient = res.getWriter();

    toClient.println( myHeader );

    String qs = req.getQueryString();

    if ( qs==null || qs.equals("") )
    {
      toClient.println( "<p>GET Method needs valid QUERY_STRING</p>" );
    }
    else
    {
      toClient.println
        ( "<p>GET Method received QUERY_STRING as " + qs + "</p>" );

      int loopCount = Integer.parseInt( qs );

      if (loopCount < 1)
      {
        loopCount = 1;
        toClient.println( "<p>Loop Count was less than one</p>" );
      }
      if (loopCount > 1000)
      {
        loopCount = 1000;
        toClient.println( "<p>Loop Count was greater than 1000</p>" );
      }

      toClient.println( "<pre>" );

      while (loopCount > 0)
        toClient.println( "Test message loop countdown at " + loopCount-- );

      toClient.println( "</pre>" );
    }

    toClient.println( myFooter );
    
    toClient.close();
  }


  // this method is invoked for http POST requests
  
  public void doPost( HttpServletRequest req, HttpServletResponse res )
    throws IOException
  {
    res.setContentType( "text/html" );

    PrintWriter toClient = res.getWriter();

    toClient.println( myHeader );

    int contLen = req.getContentLength();

    toClient.println
      ( "<p>POST Method received CONTENT_LENGTH as " + contLen + "</p>" );
    
    toClient.println( "<p>No need to parse out HTML form data myself!</p>" );

    String loopStr = req.getParameter( "myloop" );
    String testMsg = req.getParameter( "mytext" );

    int loopCount =
      (loopStr == null) ? 10 : Integer.parseInt( loopStr );

    if (testMsg == null)
      testMsg = "Default Test Message";

    toClient.println( "<pre>" );

    while (loopCount > 0)
    {
      toClient.println
        ( "Countdown at " + loopCount + " with message " + testMsg );
      loopCount--;
    }

    toClient.println( "</pre>" );

    toClient.println( myFooter );
    
    toClient.close();
  }
}