Servlet Tutorial | JSP Tutorial | Advanced Java Tutorial | Java Certification Training | Edureka

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Topics to be covered
01
02
03
05
06
07
Introduction to Web
Introduction to Servlets
Generic Servlets
Introduction to JSP
Steps to create JSP
JSP Scripting & Directive
Elements
04 08Session Tracking Java Bean Class

Web & HTTP

Web & HTTP
HTTP is a protocol that clients and servers use
on the web to communicate.

HTTP Request & Response
HTTP Request
HTTP Response
Client Server
HTTP Response is the packet of information sent by Server to the Client
in response to an earlier Request made by Client
HTTP Request is a packet of Information that one computer sends to another
computer to communicate something

What are Servlets?
Creates Web Application
Provides Interfaces & Classes
Must be implemented to create Servlet
Robust & Scalable
Deployed to create Web Page
Responds to any incoming requests

What are Servlets?
Request
Response is generated at runtimeResponse is sent to client
Client Server

Servlet Life Cycle
Handling Request
Loading &
Instantiation
Initialized
End
Start
Stop
init()
service()
destroy()
End of
Request
thread

Steps to create Simple Servlet
Create and compile simple servlet code
1
Start Apache Tomcat
3
Add mappings to web.xml file
2
Start Web Browser & Request Servlet
4

Generic Servlet
A generic servlet is a
protocol independent
Servlet that should always
override the service()
method to handle the client
request..
Generic Servlet is
easier to write
It has a very simple life cycle
methods
To write Generic Servlet you just
need to extend
javax.servlet.GenericServlet and
override the service() method
Pros

Servlet Classes & Interfaces
Servlet Declares life cycle method of servlet
ServletConfig Allows servlet to get Initialization methods
ServletContext Enables servlet to log access and access information
ServletRequest Used to read data from client request
ServletResponse Used to write data to client response
GenericServlet Implements servlet and Servlet.Config Interface
ServletInputStream Provides input stream to read requests from the client
ServletOutputStream Provides output stream to write responses to the client
ServletException Indicates servlet error has occured
UnavailableException Indicates servlet is not available
HttpServlet Provides methods to handle Http Request and Response
HttpServletRequest Enables servlets to read data from Http Request
HttpServletResponse Enables servlets to write data to Http Response

Session Tracking in Servlets
Session tracking is a way to maintain state(data) of an user
1. Request(new)
3. Second new request
2. Response
Client
Server

Cookies
URL
rewriting
Hidden
form field
Http
session

Cookies in Servlet
It is a small piece of information that is persisted between the multiple client requests
1. Request
2. Request + Cookies
3. Response + Cookies

Useful Methods of Cookie Class
public void setMaxAge(int expiry) Sets the maximum age of the cookies in seconds
public String getName() Returns the name of the cookie. Name cannot be changed after creation
public String getValue() Returns the value of the cookie
public void setName(String name) Changes the name of the cookie
public void setValue(String value) Changes the value of the cookie

Creating & Deleting a Cookie
Deletion
Creation
1.Cookie ck=new Cookie("user",“Edureka");//creating cookie object
2.response.addCookie(ck);//adding cookie in the response
1.Cookie ck=new Cookie("user","");//deleting value of cookie
2.ck.setMaxAge(0);//changing the maximum age to 0 seconds
3.response.addCookie(ck);//adding cookie in the response

What is JSP?
It is used to create web application just like Servlet technology. Also called as extension of servlet
Fast Development
Tracking User
Easy to maintain
Portable
Powerful
Flexible

Advantages of JSP over Servlets
JSP
Operation
Servlets
▪ Extension to Servlet ▪ It is not a extension of JSP
▪ No need to recompile and redeploy ▪ Code needs to be recompiled
▪ Less code than servlet ▪ More code comparatively
▪ Easy to maintain ▪ Bit complicated

Life Cycle of JSP
Buffer
(dynamic content)
Servlet Object
JRE
JSP
Servlet (.java File)
Class file
Compiler
JSP Translator

Steps to create JSP Page
Create dynamic web project
1
Start Apache Tomcat
3
Create JSP File
2
Deploy the project and get the output
4

Jsp Scripting &
Directive elements

JSP Scripting Elements
<% java source code %>scriptlet
<%= statement %>expression
<%! field or method declaration %>declaration

Implicit Objects of JSP
out Jspwriter
request HttpServletrequest
response HttpServletResponse
config ServletConfig
application ServletContext
session HttpSession
pageContent PageContext
page Object
exception Throwable

JSP Directive Elements
<%@ page directive="value” %>Page directive
<%@ include file="resourceName" %>Include directive
<%@ taglib uri="uriofthetaglibrary" prefix="prefixoftaglibrary" %>Taglib directive

Java Bean Class
It is a reusable software component. A bean encapsulates many objects into one object, so we can access
this object from multiple places. Moreover, it provides the easy maintenance.
1.<jsp:useBean id= "instanceName" scope= "page | request
| session | application"
2.class= "packageName.className" type= "packageName.clas
sName"
3.beanName="packageName.className | <%= expression >" >
4.</jsp:useBean>

Servlet Tutorial | JSP Tutorial | Advanced Java Tutorial | Java Certification Training | Edureka

Servlet Tutorial | JSP Tutorial | Advanced Java Tutorial | Java Certification Training | Edureka

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