Copyright © 2002 ProsoftTraining. All rights reserved. JavaServer Pages

Copyright © 2002 ProsoftTraining. All rights reserved.

JavaServer Pages


Lesson 1:Introduction to

JavaServer Pages

Objectives

• Define JavaServer Pages (JSP)• Define Java servlets• Define Enterprise JavaBeans (EJB)• Compare JSP to other server-side

programming environments• Explain the advantages of JSP• Understand the mechanics of JSP documents• Use basic JSP syntax• Describe how to invoke JSP documents

What IsEnterprise JavaBeans (EJB)?

• EJB = An architecture for deploying component-based distributed applications– J2EE-compliant application servers

What AreJava Servlets?

• Java servlets provide the functionality of the CGI for Java-driven Web applications– Managed and executed on a Web server

that provides a servlet container– Executed within a single JVM and server

process

What Is JSP?

• Server-side programming environment– Contains normal HTML with special syntax

that allows dynamic content

Web Application Technologies

• Common Gateway Interface (CGI)• Server extensions• Server-side scripting

– ColdFusion– PHP Hypertext Preprocessor (PHP)

JSPAdvantages and Mechanics

• Java = powerful programming language– Built-in APIs

• JSP applications are portable• JSP engine locates the JSP document• JSP engine processes the JSP document

into a servlet• JSP engine passes control to servlet engine

BasicJSP Syntax

• Script blocks

<% //Java code %>

• JSP files with comments

<%-- JSP comment --%>

Summary

Define JavaServer Pages (JSP) Define Java servlets Define Enterprise JavaBeans (EJB) Compare JSP to other server-side

programming environments Explain the advantages of JSP Understand the mechanics of JSP documents Use basic JSP syntax Describe how to invoke JSP documents


Lesson 2:JSP Fundamentals

Objectives

• Describe various styles of JSP syntax• Use JSP expressions• Use JSP scriptlets• Use JSP declarations• Use predefined variables

EvaluatingJava Expressions

• Syntax:

<%= new java.util.Date( ) %>

Using JSP Scriptlets

• Scriptlets allow you to: – Perform complex operations within a JSP

document– Intersperse blocks of Java code with

normal HTML

Using JSP Declarations

• JSP declarations:– Provide a construct in which to declare

methods and variables– Do not produce output– Use the following syntax:

<%! //Java code %>

Using JSPPredefined Variables

• The request variable• The response variable• The out variable• The application variable• The session variable• The config variable• The pageContext variable• The page variable

Summary

Describe various styles of JSP syntax Use JSP expressions Use JSP scriptlets Use JSP declarations Use predefined variables


Lesson 3:JSP Directives

Objectives

• Define JSP directives• Use the page directive• Use page directive attributes• Use the include directive• Use the jsp:include element• Add and manipulate Java applets in JSP files

using the jsp:plugin element

Introductionto JSP Directives

• The page directive– The import attribute– The language attribute– The contentType attribute– The pageEncoding attribute– The extends attribute– The isThreadSafe attribute– The session attribute– The buffer attribute– The autoFlush attribute– The errorPage attribute– The isErrorPage attribute– The info attribute

IncludingFiles in JSP

• Using the include directive• Using the jsp:include element

Using thejsp:plugin Element

• The jsp:plugin element is used to:– Add Java applets to JSP files– Determine the appropriate tag for the client

browser accessing the JSP file

Summary

Define JSP directives Use the page directive Use page directive attributes Use the include directive Use the jsp:include element Add and manipulate Java applets in JSP files

using the jsp:plugin element


Lesson 4:JSP and JavaBeans

Objectives

• Define JavaBeans• Explain the concept of component-centric

architecture• Describe the advantages of JavaBeans• Instantiate JavaBeans• Use JSP-JavaBeans tags to access and

manipulate JavaBeans properties• Explain the conventions for constructing

JavaBeans• Use the serializable interface• Access JavaBeans through scripting elements

Component-Centric Architecture

• Component-centric architecture:– Allows for handling complexity– Divides complex systems into components

JavaBeans

Java server

Database server

JSP—JavaBeans Tags

Tag Description

<jsp:useBean> Used to instantiate a JavaBean and create a reference to it

<jsp:getProperty> Used to access a JavaBean property

<jsp:setProperty> Used to modify a JavaBean property

Rules forConstructing JavaBeans

• Class• Constructor• Property• Methods

– Regular methods– Access methods

The JavaBeanSerializable Interface

• When a JavaBean is serialized, its property values are frozen

• To make the JavaBean serializable, it should implement the Serializable interface

Accessing JavaBeans Through Scriptlets and Expressions

• After the <jsp:useBean> tag instantiates a JavaBean and has a reference to it, the JavaBean can be used in scriptlets and expressions throughout the scope of the JavaBean

Summary

Define JavaBeans Explain the concept of component-centric

architecture Describe the advantages of JavaBeans Instantiate JavaBeans Use JSP-JavaBeans tags to access and

manipulate JavaBeans properties Explain the conventions for constructing

JavaBeans Use the serializable interface Access JavaBeans through scripting elements


Lesson 5:JSP Custom Tagsand Tag Libraries

Objectives

• Describe JSP custom tags• Explain the need for JSP tag libraries• Define and use the taglib directive• Download, install and use a tag library• Create custom handler classes and descriptor

files• Create tag attributes• Use a custom tag• Deploy tag libraries

Why UseTag Libraries?

• Custom tag libraries:– Allow you to create complex objects that

can be used by JSP developers– Allow you to reuse code across multiple

JSP applications

UsingCustom Tags

• Using a tag library– The number of pre-existing tag libraries is

growing

Creating JSPCustom Tag Libraries

• Three steps to creating a custom tag:– Define a tag handler class– Define a tag library descriptor– Define a JSP page that uses the custom tag

• The taglib directive

Using CustomTags in JSP Files

• Key elements of a custom tag:– Tag name– Attributes– Nesting– Body content

Tag Handlers

TagLibrary Descriptor

• Root element = <taglib>• Subelements = tlibversion

shortname info

• Deploying tag libraries

Summary

Describe JSP custom tags Explain the need for JSP tag libraries Define and use the taglib directive Download, install and use a tag library Create custom handler classes and descriptor

files Create tag attributes Use a custom tag Deploy tag libraries


Lesson 6:JSP and Java Servlets

Objectives

• Define servlets• Write simple servlets• Discuss the difference between servlets and

JSPs• Explain the concept of MVC design pattern• Describe the layers of MVC design pattern• Explain Models 1 and 2 Web application designs• Define the RequestDispatcher interface• Use the RequestDispatcher to dispatch

requests

Servlets

• Java servlets = Java classes that implement the javax.servlet.Servlet interface

• Servlets have no main method for handling requests– Using the GET method

Servlets vs. JSP

• Manageability problems with servlets• How can JSP help?

WebApplication Architecture

• Presentation layer• Application layer• Control layer

MVCDesign Pattern

JSP vs. Servlet Architecture

• Model 1 architecture• Model 2 architecture• Model 1 and Model 2 architecture trade-offs

Model 1Architecture

Model 2Architecture

Page-Centric Design

Servlet-Centric Design

Controlling the Flowwith RequestDispatcher

• Acquiring a RequestDispatcher object• Using the RequestDispatcher object• Where to place the servlets• Incorporating another resource's output in a

servlet• Forwarding a request from a JSP to other

resources

Summary

Define servlets Write simple servlets Discuss the difference between servlets and

JSPs Explain the concept of MVC design pattern Describe the layers of MVC design pattern Explain Models 1 and 2 Web application

designs Define the RequestDispatcher interface Use the RequestDispatcher to dispatch

requests


Lesson 7:JSP,

HTML Forms and Databases

Objectives

• Describe the tiers in a three-tier distributed application

• Discuss a Web communication between tiers• Use HTML forms and their input elements• Use the request object to communicate

between HTML forms and JSP files• Explain the concept of relational databases• Use the main SQL statements• Describe Java Database Connectivity• Connect to a database and access information• Create an example of an HTML form

DistributedMulti-Tiered Applications

• Client tier• Server tier• Database tier

Steps in aTypical Web Communication

http://java.sun.com/getjava/download.html

Hypertext Transfer Protocol

Host name

Path name

HTML Forms

• Text field input

• Radio button input

• Check box input

• Drop-down menu input

• Reset and submit buttons

Request Object

• Contains:– Methods for storing and retrieving attribute

values– Methods for accessing request parameters– Methods for retrieving request headers– Methods for other uses

RelationalDatabases

• Database Management System (DBMS)• Queries

StructuredQuery Language (SQL)

• Data Definition Language (DDL)• Data Manipulation Language (DML)• Data Control Language (DCL)

Java DatabaseConnectivity (JDBC)

• Load a JDBC driver• Connect to a database• Execute SQL statements• Disconnect from a database

Summary

Describe the tiers in a three-tier distributed application

Discuss a Web communication between tiers Use HTML forms and their input elements Use the request object to communicate

between HTML forms and JSP files Explain the concept of relational databases Use the main SQL statements Describe Java Database Connectivity Connect to a database and access information Create an example of an HTML form

JavaServer Pages

Introduction to JavaServer Pages JSP Fundamentals JSP Directives JSP and JavaBeans JSP Custom Tags and Tag Libraries JSP and Java Servlets JSP, HTML Forms and Databases

Documents

Copyright © 2002 ProsoftTraining. All rights reserved. JavaServer Pages