JEE Programming - 04 Java Servlets

Module 04 – Java Servlets

Danairat T.

Line ID: Danairat

FB: Danairat Thanabodithammachari

+668-1559-1446

JEE and Web Application Development The Course Outline

Module 01 - Introduction to JEE

Module 02 - The JEE Containers

Module 03 - The Model-View-Controller Design Pattern

Module 04 - Java Servlets

Module 05 - Java Server Pages in MVC

Module 06 - JEE Web Application Deployment

Module 07 - Enterprise Java Bean

Module 08 - JEE Enterprise Application Deployment

Java Servlets

Java programming language class that is used the capabilities of servers that host applications accessed by means of a request-response programming model.

The javax.servlet and javax.servlet.http packages provide interfaces and classes for writing servlets.

The HttpServlet class provides methods, such as doGet and doPost, for handling HTTP-specific services.

Java Servlets Architecture

Java Servlets

Java Servlets Life Cycle

Variable Scopes

Application Scope

Session Scope

RequestScope

Create in Servlet or JSP and retrieve the attributes by only next target Servlet or JSP

Create in Servlet or JSP and retrieve the attributes by Servlet or JSP until

• Servlet/JSP activate session invalidation

• User close Web Browser

Initial attributes by the Application Server and retrieve the attributes by Servlet or JSPuntil Servlet shutdown

Java Servlets in Deployment File Structure

Hands-on Lab: Basic Servlets


1. Select “New Application@” 2. Select “Java EE Web Application”


3. Enter Application Name 4. Click “Next”


5. Click “Next” 6. Click “Next”


5. Click “Next” 6. Click “Finish”


7. Click “New” from “ViewController” project 8. Select “HTTP Servlet”


9. Click “Next” 10. Enter Class name”, Click “Next”


13. Make Some change in the code


14. Click “Save” and Click “Run” the Servlet


15. Result Servlet Web

Hands-on Lab: Servlet Data Source

Connection

Hands-on Lab: Servlet Data Source Connection

1. Click “New Application@” 2. Select “Java EE Web Application”, Click “OK”


3. Enter “Servlet_JDBC_DS” for Application Name 4. Click “Next”


9. Click “New” from “ViewController” project 10. Select “HTTP Servlet”, Click “OK”


11. Enter “Servlet_JDBC_DS” for Class 12. Click “Next”


13. Click “Finish”


14. Make change to the code


16. Make change to the code, Click “Run”


17. See the Result from Database

Hands-on Lab: Servlets and HTTP

Session Handling

Hands-on Lab: Servlets and HTTP Session HandlingCreating HTTP Session

1. Click “New Application@” 2. Select “Java EE Web Application”, Click “OK”


3. Enter Servlet Name 4. Click “Next”


9. Click “New” from “ViewController” project 10. Select “HTTP Servlet”, Click “OK”


11. Enter Servlet Class Name 12. Click “Next”


14. Make change to the code by set HTTP session attribute

Hands-on Lab: Servlets and HTTP Session HandlingGetting HTTP Session

15. Click “New” from “ViewController” project 16. Select “HTTP Servlet”


17. Enter Servlet Name 18. Click “next”


20. Make change to the code by adding the HTTP session retrieval


21.Click “Run” from the “Servlet_SetHTTPSession”


22. Done execute adding properties to HTTP Session


23. Retrieve the session from other servlet “servlet_gethttpsession”


23. (Optional) Test access the Servlet_GetHTTPSession before the set HTTP Session

Hands-on Lab: Servlets invalidate the

HTTP Session

Hands-on Lab: Servlets invalidate the HTTP Session

1. Click “New” from “ViewController” projectby using the previous Application workspace 2. Select “HTTPServlet”


3. Enter Servlet Name 4. Click “Finish”


6. Click “Run” from “Servlet_Set_HTTPSession”


7. The result from set session servlet


8. Type the URL to access “Servlet_GetHTTPSession”, The session attribute displayed


9. Access the invalidate HTTP Session


10. Access the “Servlet_GetHTTPSession

Hands-on Lab: Servlets Package and

Deployment

Hands-on Lab: Servlets Package and Deployment

1. Open “Servlet_JDBC_DataSource”, Click “Deploy” from “ViewController” project


2. Select “Deploy to WAR”, Click “Next” 3. Click “Finish”


4. You will see the output WAR file 5. Select “Launch Administrative Console”


6. Login as WebLogic administrator 7. Click “Deployment”


8. Click “Install”


9. Select the target WAR file


10. Click “Next”


11. Application monitoring


12. Test Servlet access JDBC Data Source

Danairat T.

Line ID: Danairat

FB: Danairat Thanabodithammachari

+668-1559-1446

Thank you

JEE Programming - 04 Java Servlets

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