1. CS520 Web Programming Bits and Pieces of Web Programming (II) Chengyu Sun California State University, Los Angeles

2. Roadmap Sending email Task scheduling and execution View Template Framework Application deployment

3. Email Function in Web Applications Various notifications, e.g. order, payment, shipment, forum post and reply, account activities, and so on Advertisement campaigns and product promotions Password reset …

4. How Email Works SMTP, IMAP, POP Client AClient B Email Server AEmail Server B ??

5. JavaMail http://www.oracle.com/technetwork/java/jav amail/index.html Maven dependency: javax.mail:mail Properties props = System.getProperties(); props.put("mail.smtp.host", mailhost); Session session = Session.getInstance( props ); Message msg = new MimeMessage(session);... Transport.send( msg );

6. Set Up a Local Email Server for Testing hMailServer on Windows - http://csns.calstatela.edu/wiki/content/ cysun/course_materials/hmailserver http://csns.calstatela.edu/wiki/content/ cysun/course_materials/hmailserver postfix on Linux - http://csns.calstatela.edu/wiki/content/ cysun/notes/ubuntu_server#email http://csns.calstatela.edu/wiki/content/ cysun/notes/ubuntu_server#email

7. Spring Email Support Need spring-context-support dependency Declare a mailSender bean JavaMailSender interface JavaMailSender See CSNS2 for example Mail message classes SimpleMailMessage  No attachment, no special character encoding MimeMailMessage

8. Examples of Scheduled Tasks Periodic emails, e.g. Information about weekly sale Forum daily digests Member newsletters Payment reminders Batch data processing

9. Concepts in Task Scheduling and Execution … Task Executor Use one thread for each task Use one thread for all tasks Use a thread pool Schedule (a.k.a. Trigger) E.g. every 5 minutes, every day at midnight, every first Sunday of each month at 8am …

10. … Concepts in Task Scheduling and Execution Scheduler Executor Task Schedule/Trigger

11. Spring Configuration namespace <task:executor id="executor" pool-size="5"/> <task:annotation-driven scheduler="scheduler" executor="executor" /> Creates a scheduler Creates a thread pool Based executor Enables annotations @Scheduled and @Async

12. @Scheduled http://docs.spring.io/spring/docs/curren t/javadoc- api/org/springframework/scheduling/an notation/Scheduled.html

13. Cron Expression Six field separated by space 1. Seconds (0-59) 2. Minutes (0-59) 3. Hours (0-23) 4. Day of month (1-31) 5. Month (1-12 or JAN-DEC) 6. Day of week (1-7 or MON-SUN)

14. Cron Field Values Single value, e.g. 12 Set of values, e.g. 0,15,30,45 Range, e.g. 1-12,MON-FRI,* (first- last) Range with step, e.g. 1-12/3

15. Cron Expression Examples 0 0 * * * * 0 */10 * * * * 0 0 8 * * MON-FRI 0 0 1 1,15 * * Every hour at the beginning of the hour Every 10 minutes Every weekday at 8AM Every 1 st and 15 th of each month at 1AM

16. Apache Tiles http://tiles.apache.org/ A template framework for JSP Similar to Master Page and Razor in ASP.NET

17. The Need for View Templates Header Footer Content 1 Header Footer Content N page1.jsppageN.jsp

18. Why JSP Is Not Enough It breaks HTML syntax, e.g. in header.jsp and in footer.jsp. It’s difficult to create and manage multiple complex templates.

19. Basic Tiles Usage Template page = JSP + placeholders (i.e. attributes), Content: JSP, string, other tiles Definition: combine template and content Tiles Tag Library http://tiles.apache.org/framework/tiles-jsp/tlddoc/index.html

20. A Tiles Example Header Footer Content 1 Header Footer Content 2 page1.jsppage2.jsp

21. Tiles – Template Page Header Footer template.jsp

22. Tiles – Content Pages Content 1Content 2 page1.jsppage2.jsp

23. Tiles – Definitions

24. Resolve Tiles Views in Spring /WEB-INF/tiles.xml

25. Tiles Usage in CSNS2 WEB-INF/layout for template and header/footer pages WEB-INF/content for content pages WEB-INF/tiles.xml for definitions

26. Application Deployment Computer for Development Server Hosting the Web Application Deploy Application

27. Directory Structure of a Java Web Application Application Root Directory WEB-INF JSPs and static resources classes web.xml lib Compiled Java classes Additional Java libraries

28. WAR Files Web application ARchive A JAR file for packaging, distributing, and deploying Java web applications Create WAR files The command line tool jar Eclipse Export -> Web -> WAR file mvn package

29. Deploy WAR Files to a Tomcat Server Copy the WAR file to the webapps folder Use the Manager App Need a user with the manager-gui role More options at http://tomcat.apache.org/tomcat-7.0- doc/deployer-howto.html http://tomcat.apache.org/tomcat-7.0- doc/deployer-howto.html