1. Copyright © 2002 ProsoftTraining. All rights reserved. Java Servlets

2. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 1: Introduction to Java Servlets

3. Objectives Describe the differences between servlets and other Web application technologies Explain the difference between the GET and POST methods of making an HTTP request Create a simple servlet using GET Create a simple servlet using POST Define a simple deployment descriptor

4. Introduction to Web Applications Web application technologies –Common Gateway Interface (CGI) –Server extensions –Server-side scripting –JavaServer Pages –Java servlets

5. Hypertext Transfer Protocol The GET method The POST method Additional methods

6. Writing a Simple Servlet

7. Responding to Form Data FormServlet getParameter method Using the POST method

8. Deployment Descriptors XML files conforming to Sun Microsystems DTD –Describes servlets contained within a Web application

9. Summary Describe the differences between servlets and other Web application technologies Explain the difference between the GET and POST methods of making an HTTP request Create a simple servlet using GET Create a simple servlet using POST Define a simple deployment descriptor

10. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 2: The Servlet Life Cycle

11. Objectives Describe the servlet life cycle Create init and destroy methods Retrieve servlet initialization parameters Use the SingleThreadModel interface Retrieve CGI environment variables Retrieve and use the ServletContext object Use temporary files

12. The Multithreaded Model Servlets typically operate in a multithreaded environment –The Web server usually instantiates only one instance of a servlet to serve all clients Deployment descriptors and the multithreaded model

13. The Single Thread Model The Web server guarantees that no two threads will ever operate concurrently on the same servlet instance To designate servlets to use the single thread model, implement the following interface: –javax.servlet.SingleThreadModel

14. The init and destroy Methods The init method –Initialization parameters and the deployment descriptor The destroy method

15. CGI Environment Variables AUTH_TYPE CONTENT_LENGTH CONTENT_TYPE HTTP_ACCEPT HTTP_REFERER HTTP_USER_AGENT PATH_INFO PATH_TRANSLATED QUERY_STRING REMOTE_ADDR REMOTE_HOST REMOTE_USER REQUEST_METHOD SCRIPT_NAME SERVER_NAME SERVER_PROTOCOL SERVER_PORT

16. The ServletContext Methods for obtaining server information Using temporary files

17. Summary Describe the servlet life cycle Create init and destroy methods Retrieve servlet initialization parameters Use the SingleThreadModel interface Retrieve CGI environment variables Retrieve and use the ServletContext object Use temporary files

18. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 3: Responding to a Request

19. Objectives Use client-side caching Use client pull to update a client Redirect the client to another URL Use persistent connections Use response status codes Return a file to a client Dynamically generate images

20. Controlling the Client Using client-side caching Using client pull Redirecting the client

21. Persistent Connections public class PersistentConnection extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setBufferSize(32 * 1024); resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); // Generate a response }

22. Status Codes Status code constants sendError method used to set status code

23. Multimedia Content Returning a file Dynamically generating images

24. Summary Use client-side caching Use client pull to update a client Redirect the client to another URL Use persistent connections Use response status codes Return a file to a client Dynamically generate images

25. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 4: Servlet Sessions

26. Objectives Track a session using hidden form fields Track a session using URL rewriting Track a session using cookies

27. Hidden Form Fields Hidden form field named "SID" with an assigned value of "1234567890"

28. URL Rewriting Servlets can build URLS that add information in the form of additional path information

29. Cookies Small pieces of information transmitted from a Web server to a Web browser Represented in Java using the Cookie class

30. Summary Track a session using hidden form fields Track a session using URL rewriting Track a session using cookies

31. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 5: Authentication and Security

32. Objectives Authenticate a user using HTTP-based authentication Authenticate a user using a form Use Secure Sockets Layer to improve security

33. HTTP-Based Authentication Users The deployment descriptor Servlets and authentication

34. Form Authentication Requires modification of the deployment descriptor –The login-config element must be modified to indicate that form authentication is to be used and to provide the URL for a login page and login error page

35. Summary Authenticate a user using HTTP-based authentication Authenticate a user using a form Use Secure Sockets Layer to improve security

36. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 6: Inter-Servlet Communication

37. Objectives Share data with another servlet Handle a single request using multiple servlets

38. Sharing Data Data-sharing methods of the ServletContext interface Sharing data with another ServletContext

39. Dispatching to Another Servlet The forward method The include method

40. Summary Share data with another servlet Handle a single request using multiple servlets

41. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 7: Building Enterprise Web Applications

42. Objectives Use JNDI to look up EJBs, resource factories and environment entries Write servlets for use in a distributed environment Use JavaMail to send e-mail

43. Java Servlets and JNDI Referencing EJBs Referencing resource factories Referencing environment entries

44. Clustering and Java Servlets Clustering styles Developing distributable servlets

45. JavaMail Add-on API that creates a full-fledged POP/iMAP client –Session class –getDefaultInstance static method

46. Summary Use JNDI to look up EJBs, resource factories and environment entries Write servlets for use in a distributed environment Use JavaMail to send e-mail

47. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 8: Internationalization

48. Objectives Use the Unicode escape sequence to specify special Latin characters Use alternative character sets to generate a non-Latin character response

49. The Latin Character Set Non-English Latin characters Languages and language codes

50. Non-Latin Character Sets Arabic Chinese Japanese Korean Russian

51. Summary Use the Unicode escape sequence to specify special Latin characters Use alternative character sets to generate a non-Latin character response

52. Java Servlets Introduction to Java Servlets The Servlet Life Cycle Responding to a Request Servlet Sessions Authentication and Security Inter-Servlet Communication Building Enterprise Web Applications Internationalization