Gateway Tutorial: VXML Application | Send Email Servlet

This Servlet class is used to send an email reply using the recorded audio file as an attachement. The recorded audio and the rest of the HTTP request are sent as multi-part file upload. The following are used to read the upload message.

    NVPair[] opts = Codecs.mpFormDataDecode(bout.toByteArray(),
                                            request.getContentType(),
                                            dir);

    for (int i = 0; i < opts.length; i++) {
        if (opts[i].getName().equals("name"))
            name = opts[i].getValue();
        else if (opts[i].getName().equals("index"))
            indexstr = opts[i].getValue();
        else
            filename = opts[i].getValue();
    }

The uploaded file is saved as a temporary file specified by filename. This temporary file is then saved as recording.wav file and sent as an attachement.

    File oldf = new File(dir, filename);
    File f = new File(dir, "recording.wav");
    f.delete();
    oldf.renameTo(f);

    ...
    email_agent.reply("Hi, this message is recorded using
                       EmailToPhone Software (http://www.emailtophone.com).",
                      f.getAbsolutePath(),
                      msg);

Source Code

package vx.apps.email;

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


public class SendEmailServlet 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);
    }

    EmailManager email_agent = EmailManager.getInstance(request);
    if (email_agent == null)
        return;

    ByteArrayOutputStream bout = new ByteArrayOutputStream();
    InputStream ins = request.getInputStream();
    byte[] chunk = new byte [256];
    int len;
    while ((len = ins.read(chunk)) != -1)
        bout.write(chunk, 0, len);

    byte[] body = bout.toByteArray();
    String dir = email_agent.getRecordDir();
    String name = null;
    String indexstr = null;
    String filename = null;

    try {
        NVPair[] opts = Codecs.mpFormDataDecode(bout.toByteArray(),
                                                request.getContentType(),
                                                dir);

        for (int i = 0; i < opts.length; i++) {
            if (opts[i].getName().equals("name"))
                name = opts[i].getValue();
            else if (opts[i].getName().equals("index"))
                indexstr = opts[i].getValue();
            else
                filename = opts[i].getValue();
        }
    }
    catch (ParseException e) {
        return;
    }

    File oldf = new File(dir, filename);
    File f = new File(dir, "recording.wav");
    f.delete();
    oldf.renameTo(f);

    if (indexstr != null && indexstr.length() != 0) { // reply
        int index = Integer.parseInt(indexstr);
        Message msg = email_agent.read(index);
        if (msg != null) {
            try {
                email_agent.reply("Hi, this message is recorded using
                          EmailToPhone Software (http://www.emailtophone.com).",
                                  f.getAbsolutePath(),
                                  msg);
            }
            catch (MessagingException e) {
            }
        }

        response.sendRedirect("email_cnt_end?index=" + indexstr);
        return;
    }

    String addr = email_agent.getContactEmail(name);
    if (addr != null) {
        try {
            email_agent.send(addr,
                             "Recorded voice message",
                             "Hi, this message is recorded using Voicent
                             EmailToPhone Software (http://www.emailtophone.com).",
                             f.getAbsolutePath());
        }
        catch (MessagingException e) {
        }
    }

    response.sendRedirect("/sindex.jsp?fromapp=email");
  }
}