Gateway Tutorial: VXML Application | Email CNT Servlet

This is the Servlet for reading a particular email content. An EmailMessageReader object is saved as a session object. It is used to refer to the current email and shared by all the Servlet for the current session.

    HttpSession session = request.getSession(true);
    EmailMessageReader emailReader =
        (EmailMessageReader) session.getAttribute("emailReader");
    if (emailReader == null) {
        emailReader = new EmailMessageReader();
        session.setAttribute("emailReader", emailReader);
    }

The rest of the Servlet simply generates the VXML content for the current email. If the email has attachment, it is redirected to email_inc, which corresponds to EmailIncServlet. Otherwise, it is redirected to email_cnt_end, which corresponds to EmailCntEndServlet.

 

Source Code

package vx.apps.email;

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

import javax.mail.*;


public class EmailCntServlet 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");
    int index = Integer.parseInt(indexstr);

    Message msg = email_agent.read(index);
    try {
        emailReader.setMessage(msg);
    }
    catch (MessagingException e) {
        pw.println("<block>Failed to set message</block>");
        pw.println("</vxml>");
        return;
    }

    String newContent = emailReader.getNewContent();
    String[] newCts = EmailMessageReader.breakup(newContent);
    String oldContent = emailReader.getOldContent();
    String[] oldCts = EmailMessageReader.breakup(oldContent);

    int numIncludes = emailReader.numIncludeFiles();

    pw.println("<form id=\"content\">");
    pw.println("<var name=\"index\" expr=\"" + indexstr + "\"/>");
    pw.println("<field name=\"readContent\">");
    pw.println(" <prompt timeout=\"1s\">");
    if (newContent == null) {
        pw.println("<block>");
        pw.println(" <audio src=\"audio/${GW_RECORDED_VOICE}/
                    email_no_content.wav\"/>");
        pw.println("</block>");
    }
    else {
        for (int i = 0; i < newCts.length; i++) {
            pw.println("<block>");
            pw.println(newCts[i]);
            pw.println("</block>");
        }
    }
    pw.println(" </prompt>");

    pw.println(" <dtmf>#</dtmf>");

    pw.println(" <noinput>");
    pw.println(" <assign name=\"readContent\" expr=\"'done'\"/>");
    pw.println(" </noinput>");
    pw.println("</field>");

    if (oldContent != null) {
        pw.println(" <field name=\"wantOldContent\" type=\"boolean\">");
        pw.println(" <prompt>");
        pw.println(" <audio src=\"audio/${GW_RECORDED_VOICE}/
                      email_prev_msg.wav\"/>");
        pw.println(" </prompt>");
        pw.println(" <filled>");
        pw.println(" <if cond=\"!wantOldContent\">");
        pw.println(" <assign name=\"readOldContent\" expr=\"'skip'\"/>");
        pw.println(" </if>");
        pw.println(" </filled>");
        pw.println(" </field>");

        pw.println(" <field name=\"readOldContent\">");
        pw.println(" <prompt timeout=\"1s\">");
        for (int i = 0; i < oldCts.length; i++) {
            pw.println(" <block>");
            pw.println(oldCts[i]);
            pw.println(" </block>");
        }
        pw.println(" </prompt>");
        pw.println(" <dtmf>#</dtmf>");
        pw.println(" <noinput>");
        pw.println(" <assign name=\"readOldContent\" expr=\"'done'\"/>");
        pw.println(" </noinput>");
        pw.println(" </field>");
    }

    if (numIncludes > 0) {
        pw.println(" <block>");
        pw.println(" <audio src=\"audio/${GW_RECORDED_VOICE}/
                      email_has.wav\"/>");
        pw.println(Integer.toString(numIncludes));
        pw.println(" <audio src=\"audio/${GW_RECORDED_VOICE}/
                     attached_files.wav\"/>");
        pw.println(" <submit next=\"email_inc\" namelist=\"index\"/>");
        pw.println(" </block>");
    }
    else {
        pw.println(" <block>");
        pw.println(" <submit next=\"email_cnt_end\" namelist=\"index\"/>");
        pw.println(" </block>");
    }

    pw.println("</form>");
    pw.println("</vxml>");
  }
}