Essential App Engine: Building High-Performance Java Apps with Google App Engine (Eiji Yamane's Library) by Adriaan de Jonge

Author:Adriaan de Jonge
Language: eng
Format: epub
Publisher: Addison-Wesley
Published: 2012-08-22T04:00:00+00:00

* * *

01 package com.appspot.mail;

02

03 import java.io.IOException;

04

05 import javax.servlet.ServletException;

06 import javax.servlet.http.HttpServlet;

07 import javax.servlet.http.HttpServletRequest;

08 import javax.servlet.http.HttpServletResponse;

09

10 import org.antlr.stringtemplate.StringTemplate;

11 import org.antlr.stringtemplate.StringTemplateGroup;

12

13 import com.google.appengine.api.mail.MailService;

14 import com.google.appengine.api.mail.MailServiceFactory;

15 import com.google.appengine.api.mail.MailService.Message;

16

17 /**

18 * Low-level alternative to SendConfirmationJMServlet.

19 */

20 public class SendConfirmationLLServlet extends HttpServlet {

21

22 private static final String SENDER =

23 "No Reply <[email protected]>";

24 private static final StringTemplateGroup templates =

25 new StringTemplateGroup("mail", "WEB-INF/templates/mail");

26

27 private static final long serialVersionUID = 818089810592369246L;

28

29 protected void doPost(HttpServletRequest request,

30 HttpServletResponse response)

31 throws ServletException, IOException {

32

33 String recipient = request.getParameter("recipient");

34 String thread = request.getParameter("thread");

35 String url = request.getParameter("url");

36 String message = request.getParameter("message");

37

38 String subject = createSubject(thread);

39 String body = createBody(url, thread);

40 String htmlBody = createHtmlBody(url, thread);

41 String attachment = createAttachment(message);

42

43 sendMail(recipient, subject, body, htmlBody, attachment);

44 }

45

46 private void sendMail(String recipient, String subject,

47 String body, String htmlBody, String attachment)

48 throws IOException {

49 MailService mailService = MailServiceFactory.getMailService();

50 Message mail = new Message(SENDER, recipient, subject, body);

51 mail.setHtmlBody(htmlBody);

52 mail.setAttachments(new MailService.Attachment("message.txt",

53 attachment.getBytes()));

54 mailService.send(mail);

55 }

56

57 private String createBody(String url, String thread) {

58 StringTemplate body =

59 templates.getInstanceOf("confirmation-body");

60 body.setAttribute("url", filter(url));

61 body.setAttribute("thread", filter(thread));

62 return body.toString();

63 }

64

65 private String createHtmlBody(String url, String thread) {

66 StringTemplate body =

67 templates.getInstanceOf("confirmation-html-body");

68 body.setAttribute("url", filter(url));

69 body.setAttribute("thread", filter(thread));

70 return body.toString();

71 }

72

73 private String createSubject(String thread) {

74 StringTemplate subject =

75 templates.getInstanceOf("confirmation-subject");

76 subject.setAttribute("thread", filter(thread));

77 return subject.toString();

78 }

79

80 private String createAttachment(String message) {

81 StringTemplate subject =

82 templates.getInstanceOf("confirmation-attachment");

83 subject.setAttribute("message", filter(message));

84 return subject.toString();

85 }

86

87 private String filter(String text) {

88 if (text == null)

89 return "";

90 return text.replaceAll("<?>?", "");

91 }

92 }

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