Java Servlet Tutorials

Java Servlets Tutorials

Java Servlets Tutorials For Beginners and Professionals

In this Java Servlets Tutorials For Beginners and Professionals article series, we are going to discussed all the basic, intermediate, and advanced concepts of Servlets with simple as well as real-time examples. 

This Servlets tutorial is for whom?

This Servlets tutorial is designed for beginners, students, and professional java developers who want to learn and enhance their Servlet Skill step by step from scratch. These tutorials provide a hands-on approach to the subject with step-by-step program examples that will assist you to learn and put the acquired knowledge into practice.

What you will learn from this Java Servlets Tutorial?

Introduction to Web Application and Web Terminology
  1. What is a Website?
  2. What is the architecture of a Static and Dynamic Website?
  3. What is a Java-Based Dynamic Website?
  4. What is Web Client?
  5. What is a Web Server?
  6. How to overcome the Limitations of Web Server?
  7. What are the General Duties of a Server-side Program in the context of a website?
  8. What type of application can be developed using Java?
  9. Understanding Tier Architecture
  10. Understanding Server-Side Programming
  11. Why Server-Side Programming?
  12. Advantages of Server-Side Programs
  13. Understanding Client-Server Architecture
Introduction to Java Servlets
  1. What is not Servlet?
  2. What is Servlet?
  3. What is the need for Servlet Technology?
  4. What is Web Container?
  5. What can a Servlet do in a java website?
  6. What are the similarities between Static and Dynamic Webpages?
  7. What are the Differences between Static and Dynamic Webpages?
  8. What is Java Servlet?
  9. What is a Servlet Container?
  10. Advantages of Servlet
  11. Features of Servlet
  12. Difference Between Servlets and JSP
  13. Why learn servlet?
  14. Applications of Servlet
  15. Java Servlets Architecture
  16. Servlet Packages
HTTP Protocol
  1. What are HTTP Protocols?
  2. HTTP Request Headers
  3. Http Response Format
  4. Why do we need an HTTP response status code?
  5. Methods of setting HTTPResponse Status Codes
  6. Methods for Sending Error
  7. Common Status Codes with Status Message
  8. Why HTTP Response Headers?
  9. Requirements of HTTP Protocols
  10. How HTTP Protocol is able to manage stateless nature?
  11. HTTP Methods
  12. What are HTTP request methods?
  13. What is the difference between GET and POST method?
Servlet API
  1. Java Servlet API
  2. Interfaces in javax.servlet package
  3. Classes in javax.servlet package
  4. Interfaces in javax.servlet.http package
  5. Classes in javax.servlet.http package
Servlet Interface
  1. Java Servlet Interface
  2. Servlet Interface Methods
  3. 1. init() method
  4. 2. service() method
  5. 3. getServletConfig() method
  6. 4. getServletInfo() method
  7. 5. destroy() method
  8. Example: To understand the Java Servlet Interface
GenericServlet class
  1. Java Generic Servlet
  2. What are the limitations of the GenericServlet?
  3. What is the general structure of a real servlet (used in real web-based java projects in the industry)?
  4. Methods of Generic Servlet class
  5. Example to demonstrate Generic Servlet
HttpServlet class
  1. What is HttpServlet?
  2. Methods of HttpServlet class
  3. Example to demonstrate HttpServlet
  4. Different approaches for using the get and post method
Life Cycle of a Servlet
  1. Understanding Servlet Life Cycle
  2. General Structure of a Simple User-Defined Servlet
  3. Instantiation phase of a Servlet
  4. How is the Servlet Container loading and Instantiating the Servlet?
  5. Initialization Phase of a Servlet
  6. Servicing Phase of a Servlet
  7. Destruction Phase of the Servlet
  8. Servlet Life Cycle Methods
Steps to create a servlet example
  1. What are the different steps involved in Java Web Application?
  2. Step-1: Web Application Directory Structure
  3. Step2: Developing the web resources (and helper files if any)
  4. Step3: Developing the deployment descriptor (web.xml)
  5. Step4: Configuring the application files.
  6. What is the Purpose of <servlet> tag?
  7. What is the Purpose of <servlet-mapping> tag?
  8. How many names can a Servlet have in a Java Web Application?
  9. Understanding the URL Patterns
  10. Different Ways to Prepare Servlet in Java
Developing First Java Servlet Application?
  1. First Java Servlet Application
  2. What is response.setContentType(“text/html”) method call?
  3. What happens if I placed the main() in our servlet program?
  4. How the servlet program is executing without the main(-) method?
  5. What happens if the programmer calls destroy() method explicitly from the service(-,-) method of the servlet program?
  6. What happens if the programmer calls the init(-) method explicitly from the service(-,-) method of the servlet program?
  7. Explain about the specification
  8. What is the difference between web applications and web site?
  9. Explain about static web resource programs and dynamic web resource programs
  10. How we identify whether a web resource program is client-side or server-side?
  11. Explain about TOMCAT server
How does Servlet work?
  1. How does the Servlet Work in Java Application?
  2. How web container handles the servlet request?
  3. What is written inside the public service method?
  4. What is written inside the protected service method?
  5. Servlets flow of execution
User Interface Forms Design

Static Form Design
Dynamic Form Design

War File

What is a war file?
How to create a war file?
How to deploy the war file?
How to extract the war file manually?

Welcome-file-list in web.xml

load on startup in web.xml
Advantage of load-on-startup element
Passing positive value
Passing negative value

Servlet IDE

Creating Servlet Example in Eclipse
Creating Servlet in MyEclipse IDE
Creating a servlet in NetBeans IDE

Servlet Communication

Browser-Servlet Communication
Sending Error Messages
Request Redirection
Web Component Communication
Applet Servlet Communication

ServletRequest Interface

Methods of ServletRequest interface
Example of ServletRequest

RequestDispatcher in Servlet

Methods of RequestDispatcher interface
How to get the object of RequestDispatcher
Example of RequestDispatcher interface

SendRedirect in servlet

Difference between forward() and sendRedirect() method
Example of sendRedirect method in servlet
Creating custom google search using sendRedirect

ServletConfig Interface

Advantage of ServletConfig
Methods of ServletConfig interface
How to get the object of ServletConfig
Example of ServletConfig

ServletContext Interface

Advantage of ServletContext
Usage of ServletContext Interface
Commonly used methods of ServletContext interface
How to get the object of ServletContext interface
Example of ServletContext

Attribute in Servlet

Attribute specific methods of ServletRequest, HttpSession, and ServletContext interface
Example of ServletContext
Difference between ServletConfig and ServletContext

Session Tracking in Servlets

Why use Session Tracking?
Cookies
Hidden Form Field
URL Rewriting
HttpSession

Cookies in Servlet

How Cookie works
Types of Cookie
      Non-persistent cookie
       Persistent cookie
Advantage of Cookies
Disadvantage of Cookies
Cookie class
The constructor of Cookie class
Methods of Cookie class
How to create Cookies?
How to delete cookies?
How to get Cookies?
example of Servlet Cookies
Servlet Login and Logout Example using Cookies

Hidden Form Field

The real application of hidden form field
Advantage of Hidden Form Field
The disadvantage of Hidden Form Field
Example of using Hidden Form Field

URL Rewriting

Advantage of URL Rewriting
The disadvantage of URL Rewriting
Example of using URL Rewriting

HttpSession interface

Advantage of HttpSession
Disadvantage of HttpSession
How to get the HttpSession object?
methods of HttpSession interface
Example of using HttpSession
Servlet HttpSession Login and Logout Example

Event and Listener in Servlet

Event classes
Event interfaces
ServletContextEvent
HttpSessionEvent
ServletRequestEvent
ServletContext AttributeEvent
HttpSessionBindingEvent
ServletRequestAttributeEvent

Servlet Wrappers

Servlet Filter

Usage of Filter
Advantage of Filter
Filter API
Filter
FilterChain
FilterConfig
How to define Filter
Example of Filter

Authentication Filter

Example of authenticating a user using the filter

FilterConfig

Methods of FilterConfig interface
Example of FilterConfig

CRUD in Servlet

Servlet CRUD example
Pagination in Servlet

Servlets – Exception Handling

web.xml Configuration
Request Attributes − Errors/Exceptions
Error Handler Servlet Example

ServletInputStream class

Method of ServletInputStream class
Example of ServletInputStream class

ServletOutputStream class

Methods of ServletOutputStream class
Example of ServletOutputStream class

Servlet with Annotation

Example of servlet by annotation

SingleThreadModel interface

Example of SingleThreadModel interface

Server Side Include (SSI)

Servlets – Debugging

Message Logging
Using JDB Debugger
Using Comments
Client and Server Headers
Important Debugging Tips

Servlets – Internationalization

Detecting Locale
Languages Setting
Locale Specific Dates
Locale Specific Currency
Locale Specific Percentage

Real-time Development Examples:

Example of the Registration form in servlet
Example of Fetching Result
Improving Servlet performance to fetch records from the database
Example of uploading the file to the server in servlet
Example of downloading a file from the server in servlet
Example of Sending email through JavaMail API in Servlet
Example of write data into PDF using servlet
Example of Login Form in Servlet Tutorial
Example to display image using Servlet
Example of Auto Page Refresh

Servlet Interview Questions and Answers

What do we expect from you?

We will do our level best to cover all the Java-Servlets concepts, but in the meantime, if you have any specific concept in your mind that you want us to cover, then please leave it as a comment on the comment box, and we will definitely discuss that concept(s) in this Java Servlets Tutorials course.

Prerequisites to Learn Servlets:

It is mandatory to have the Knowledge of Core Java, basics of HTML. 

About the Author:

Manisha Mahanty is a Technical Lead | Freelancer | Technical Author | SQL Server | Java | Advance Java | Python | HTML5 | Oracle Expert.

Finally, your valuable feedback is very important and means a lot to us. So, if you have a few minutes, then please let us know your thoughts and feedback on this Java Servlets Tutorials course.

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