Gateway Tutorial: VXML Application | Read Email Wave Servlet

This is the Servlet for reading email attachment that is an audio file. The Servlet first saves the audio attachment to a local directory, then simply includes the saved audio file in the generated VXML file.

    File savedFile = new File(workdir, fname);
    EmailMessageReader.readWaveFile(include, savedFile);
    ...
    pw.println("<audio src=\"" + userFname + "\"/>");

Source Code

package vx.apps.email;

import java.io.PrintWriter;
import java.io.File;
import java.io.IOException;
import javax.servlet.http.*;
import javax.mail.*;


public class ReadEmailWaveServlet extends HttpServlet
{
  public void service(HttpServletRequest request,
                      HttpServletResponse response)
    throws IOException
  {
    HttpSession session = request.getSession(true);
    EmailMessageReader emailReader =
                  (EmailMessageReader) session.getAttribute("emailReader");
    if (emailReader == null) {
        emailReader = new EmailMessageReader();
        session.setAttribute("emailReader", emailReader);
    }

    PrintWriter pw = response.getWriter();

    pw.println("<?xml version=\"1.0\"?>");
    pw.println("<vxml version=\"1.0\">");

    EmailManager email_agent = EmailManager.getInstance(request);
    if (email_agent == null) {
        pw.println("</vxml>");
        return;
    }

    String indexstr = request.getParameter("index");

    String includeIndexStr = request.getParameter("includeidx");
    if (includeIndexStr == null)
        includeIndexStr = "0";
    int includeIndex = Integer.parseInt(includeIndexStr);

    Part include = emailReader.getIncludeFile(includeIndex);
    String fname = null;
    String userFname = null;
    if (include != null) {
        try {
            fname = include.getFileName();
            userFname = "../work/" + fname;

            String dir = getServletContext().getRealPath("");
            File workdir = new File(dir, "work");
            workdir.mkdirs();

            File savedFile = new File(workdir, fname);
            EmailMessageReader.readWaveFile(include, savedFile);
        }
        catch (MessagingException e) {
            include = null;
        }
    }

    pw.println("<var name=\"index\" expr=\"" + indexstr + "\"/>");
    pw.println("<var name=\"includeidx\" expr=\"" + includeIndexStr + "+1\"/>");
    pw.println(" <block>");
    if (include == null) {
        pw.println("Sorry, there is trouble getting the audio file");
    }
    else {
        pw.println("<audio src=\"" + userFname + "\"/>");
    }

    pw.println(" <submit next=\"email_inc\" namelist=\"index includeidx\"/>");
    pw.println(" </block>");
    pw.println("</form>");
    pw.println("</vxml>");
  }
}+-