This document provides an overview of servlets and related Java web technologies including:
- The servlet API and common interfaces like Servlet, ServletRequest, and ServletResponse.
- How servlets handle HTTP requests and responses using classes like HttpServlet, HttpServletRequest and HttpServletResponse.
- Additional topics covered include session tracking, using JDBC with servlets, HTML and Java object communication with servlets, and security issues.
Some of the common interview questions asked during a Java Interview. These may apply to Java Interviews. Be prepared with answers for the interview questions below when you prepare for an interview. Also have an example to explain how you worked on various interview questions asked below. Java Developers are expected to have references and be able to explain from their past experiences. All the Best for a successful career as a Java Developer!
Some of the common interview questions asked during a Java Interview. These may apply to Java Interviews. Be prepared with answers for the interview questions below when you prepare for an interview. Also have an example to explain how you worked on various interview questions asked below. Java Developers are expected to have references and be able to explain from their past experiences. All the Best for a successful career as a Java Developer!
Introduction to J2EE framework . Gives the primary knowledge about the framework involves in J2EE based web development . This is like Struts , Hibernate , spring ,JSF etc.
Hibernate sits between traditional Java things and information source server to handle everything in persisting those things based on the appropriate O/R systems and styles.
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TUTORIAL-INTRODUCTION TO SPRING FOR BEGINNERS
EXPLANATION TO-Java Framework,Advantages of using SPRING,Difference between Hibernate and Spring.Spring architecture,Spring IoC Containters,Bean scope & Method Injection,Spring Inheritance.
Some of the common interview questions asked during a Java Interview. These may apply to Java Interviews. Be prepared with answers for the interview questions below when you prepare for an interview. Also have an example to explain how you worked on various interview questions asked below. Java Developers are expected to have references and be able to explain from their past experiences. All the Best for a successful career as a Java Developer!
Some of the common interview questions asked during a Java Interview. These may apply to Java Interviews. Be prepared with answers for the interview questions below when you prepare for an interview. Also have an example to explain how you worked on various interview questions asked below. Java Developers are expected to have references and be able to explain from their past experiences. All the Best for a successful career as a Java Developer!
Introduction to J2EE framework . Gives the primary knowledge about the framework involves in J2EE based web development . This is like Struts , Hibernate , spring ,JSF etc.
Hibernate sits between traditional Java things and information source server to handle everything in persisting those things based on the appropriate O/R systems and styles.
Hibernate sits between traditional Java things and information source server to handle everything in persisting those things based on the appropriate O/R systems and styles.
TUTORIAL-INTRODUCTION TO SPRING FOR BEGINNERS
EXPLANATION TO-Java Framework,Advantages of using SPRING,Difference between Hibernate and Spring.Spring architecture,Spring IoC Containters,Bean scope & Method Injection,Spring Inheritance.
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Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
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This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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Ethnobotany and Ethnopharmacology:
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
3. Tomcat web server
A Simple Servlet
Using Eclipse or Apache Net Beans IDE
4. Servlet API
◦ The javax.servlet Package
Interface Description
Servlet Declares life cycle methods for a servlet
ServletConfig Allows servlets to get initialization parameters.
ServletContext Enables servlets to log events and access information
about their environment.
ServletRequest Used to read data from a client request.
ServletResponse Used to write data to a client response.
5. Servlet API (continued…)
Class Description
GenericServlet Implements the Servlet and
ServletConfig interfaces.
ServletInputStream Encapsulates an input stream for
reading requests from a
client.
ServletOutputStream Encapsulates an output stream for
writing responses to a client.
ServletException Indicates a servlet error occurred.
UnavailableException Indicates a servlet is unavailable.
6. Servlet API
◦ The javax.servlet.http Package
Interface Description
HttpServletRequest Enables servlets to read data from an HTTP request.
HttpServletResponse Enables servlets to write data to an HTTP response.
HttpSession Allows session data to be read and written.
7. Servlet API (continued…)
Class Description
Cookie Allows state information to be stored on a client machine.
HttpServlet Provides methods to handle HTTP requests and responses.
Cookie: The Cookie class encapsulates a cookie.
A cookie is stored on a client and contains state information.
Cookies are valuable for tracking user activities.
8. A cookie can save the user’s name, address,
and other information.
The user does not need to enter this data
each time he or she visits the store.
A servlet can write a cookie to a user’s
machine via the addCookie( ) method of the
HttpServletResponse interface.
The data for that cookie is then included in
the header of the HTTP response that is sent
to the browser.
10. Using JDBC in Servlets
◦ RDBMS
◦ Java’s JDBC API
◦ Uses Structured Query Language (SQL)
◦ Servlets are in the middle tier in the 3-tier
architecture for accessing databases.
12. HTML to Servlet communication
Java Object serialization: allows you to take any
object that implements the Serializable interface and
turn it into a sequence of bytes that can later be fully
restored to regenerate the original object. This is true
even across a network which means that the
serialization mechanism automatically compensates
for differnces in operating systems.
13. Applets are small applications that are
accessed on an Internet server, transported
over the Internet automatically installed, and
run as part of a web document. After an
applet arrives on the client, it has limited
access to resources so that it can produce a
graphical user interface and run various
computations without introducing the risk of
viruses or breaching data integrity.
Applet to Servlet communication.
14. The software component developer
The software component assembly model
15. What is a Java Bean?
◦ A Java Bean is a software component that has been designed to be
reusable in a variety of different environments. There is no restriction on
the capability of a Bean. It may perform a simple function, such as
obtaining an inventory value, or a complex function, such as forecasting
the performance of a stock portfolio. A Bean may be visible to an end user.
One example of this is a button on a graphical user interface. A Bean may
also be invisible to a user. Software to decode a stream of multimedia
information in real time is an example of this type of building block.
Finally, a Bean may be designed to work autonomously on a user’s
workstation or to work in cooperation with a set of other distributed
components.
16. Examples of Java Bean: Software to generate a
pie chart from a set of data points is an
example of a Bean that can execute locally.
However, a Bean that provides real-time price
information from a stock or commodities
exchange would need to work in cooperation
with other distributed software to obtain its
data.
17. Advantages of Java Beans
◦ A Bean obtains all the benefits of Java’s “write-once, run-
anywhere” paradigm.
◦ The properties, events, and methods of a Bean that are
exposed to another application can be controlled.
◦ Auxiliary software can be provided to help configure a
Bean.
◦ The state of a Bean can be saved in persistent storage and
restored at a later time.
◦ A Bean may register to receive events from other objects
and can generate events that are sent to other objects.
19. Java Archive (JAR) file format: is a way to collect
a group of files into a single compressed file, just
like Zip. JAR files are cross-platform. They are
especially helpful when you deal with the
Internet. A JAR file consists of a single file
containing a collection of zipped files along with
a “manifest” file that describes them.
20. Introspection
◦ This is the process of analyzing a Bean to determine its
capabilities. This is an essential feature of the Java Beans
API because it allows another application, such as a design
tool, to obtain information about a component. Without
introspection, the Java Beans technology could not operate.
Bound properties
◦ A Bean that has a bound property generates an event when
the property is changed.
Constrained properties
◦ A Bean that has a constrained property generates an event
when an attempt is made to change its value.
21. Persistence
◦ Persistence is the ability to save the current state of a Bean,
including the values of a Bean’s properties and instance
variables, to nonvolatile storage and to retrieve them at a
later time. The object serialization capabilities provided by
the Java class libraries are used to provide persistence for
Beans.
22. Customizers
◦ A Bean developer can provide a customizer that
helps another developer configure the Bean. A
customizer can provide a step-by-step guide
through the process that must be followed to use
the component in a specific context. Online
documentation can also be provided. A Bean
developer has great flexibility to develop a
customizer that can differentiate his or her
product in the marketplace.
23. Java Beans API: some important classes
◦ Introspector
◦ PropertyDescriptor
◦ EventSetDescriptor
◦ MethodDescriptor
25. EJB clients
Deployment tips, tricks and traps for building
distributed systems
Distributed objects
Implementation and future directions of EJB
Variables in perlperl control structures and
operators
Functions and scope
27. Registering remote objects
RMI clients
Servlets and RMI communication
Pushing data from RMI Servlets
Object Request Broker (ORB)
ORB protocol
28. A comparison of RMI and ORB protocol
Common Object Request Broker Architecture
(CORBA)
29. Java Server Pages: An introduction
MVC and JSP
JSP scripting elements and directives
Working with variables scope
Error pages
Using Java Beans in JSP
Working with Java Mail
30. Understanding protocols in Java Mail
Components
Java Mail API
Integrating into J2EE
Understanding Java Messaging Services
Introducing Java Transactions
