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Introduction to the Semantic Web Tutorial

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SERVLET BASICS

Ging vin: Nguyn Hong Anh

Email: nhanh@fit.hcmus.edu.vn

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Bi gingc trch t

http://www.javapassion.com/j2ee/

http://courses.coreservlets.com/Course-

Materials/csajsp2.html

http://www.javapassion.com/j2ee/http://courses.coreservlets.com/Course-Materials/csajsp2.htmlhttp://courses.coreservlets.com/Course-Materials/csajsp2.htmlhttp://courses.coreservlets.com/Course-Materials/csajsp2.htmlhttp://courses.coreservlets.com/Course-Materials/csajsp2.htmlhttp://courses.coreservlets.com/Course-Materials/csajsp2.htmlhttp://courses.coreservlets.com/Course-Materials/csajsp2.htmlhttp://www.javapassion.com/j2ee/

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Contents

1 Servlet

2 Servlet Request & Response

3 Servlet Life Cycle

4 Scope Object

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J2EE Architecture (1.2)

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Servlet

Client SidePresentation

HTML

Java Applet

JavaApplication

Server SidePresentation

SERVLET

JSP

DatabaseAccess

JDBC

HIBERNATE

EJB,

DBMS

SQL Server

MySQL

DB2,

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Servlet Code

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Servlet Request & Response

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Request & Response

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HTTP GET & HTTP POST

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First Servlet

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Servlet Interfaces & Classes

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Servlet Life-Cycle

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Servlet Life-Cycle Methods

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Servlet Life-Cycle Methods

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Servlet Life-Cycle Methods

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init() from CatalogServlet.java

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init() reading Configuration parameters

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Setting Init Parameters in web.xml

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destroy

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Servlet Life-Cycle Methods

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service & doGet , doPost

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Service()

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doGet() & doPost()

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doGet()

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doGet()

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doGet()

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Steps of Populating HTTP Response

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Response

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Scope Objects

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Four Scope Objects: Accessibility

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Four Scope Objects: Class

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Scope Objects

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What is ServletContext For?

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Scope of ServletContext

ServletContext:

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ServletContext:

Web Application Scope

How to Access ServletContext

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How to Access ServletContext

Object?

Example: Getting Attribute

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Example: Getting Attribute

Value from ServletContext

Example: Getting and Using

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Example: Getting and Using

RequestDispatcher Object

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Example: Logging

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Why HttpSession?

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Example: HttpSession

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What is Servlet Request?

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Session

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Request

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Getting Client Sent Parameters

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A Sample FORM using GET

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A Sample FORM using GET

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A FORM Based Servlet: Get

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A Sample FORM using POST

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A Sample FORM using POST

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A Form Based Servlet: POST

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What is HTTP Servlet Request?

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HTTP Request URL

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HTTP Request URL:[requestpath]

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HTTP Request URL: [query string]

C t t P th Q P t

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Context, Path, Query, Parameter

Cookie Method

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Cookie Method

(in HTTPServletRequest)

P R t

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Page, Request

Wh t i S l t R ?

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What is Servlet Response?

R

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Responses

R St t

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Response Structure