JavaServer Pages

JavaServer Pages


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This four-day course develops skills in JavaServer Pages, or JSP, which is the standard means of authoring dynamic content for Web applications under the Java Enterprise platform. It treats JSP 2.0, including older features such as scriptlets but focusing on newer features and techniques, including JSP expressions and the JSTL. At the end of the course, students will be well prepared to author JSPs for small- or large-scale Web applications, either "by hand" (they use only a text editor in class) or using an authoring tool.

The first module begins with an introduction of Web applications in general, shows how Java servlets and JSPs establish a framework for writing Web applications, and then covers JSP 2.0 features in detail, from scripting elements to use of dedicated JavaBeans to JSP expressions, and quick introductions of JSTL and custom tag development.

By the end of the module students will be able to create their own JSP applications, including interactive applications using HTML forms and pages that perform fairly complex processing using scripts and or actions. Although scripting is covered, the scriptless authoring style encouraged by the JSP 2.0 specification is emphasized, and students will be well equipped to develop concise and effective JSP applications.

The second module covers the JSTL, or JSP Standard Tag Library, actually a set of four custom tag libraries that establish a portable standard for common processing tasks in JSP. JSTL is a major part of the new scriptless authoring style encouraged (and enabled) by the JSP 2.0 specification. This module covers all four JSTL libraries in depth:

The core actions, which support JSP expressions for JSP 1.x containers, flow control for procedural processing in JSPs, and resource access.
The formatting and internationalization/localization actions, which standardize formatted numeric and date/time output as well as multi-language support.
The SQL actions, which dramatically simplify access to relational data from a JSP.
The XML actions, which give JSPs a simple, powerful framework by which to parse, address and transform XML data using XPath and XSLT.

Each individual tag in each library is covered, with precise syntactic rules shown in a standard format in the student guide, and JSTL techniques and best practices are discussed for each library. An extensive set of example applications illustrates common usage of each major group of actions, and the module culminates with a wrap-up workshop that brings core, SQL, and XML techniques to bear in a single application.

Learning Objectives

Explain the fundamentals of HTML and HTTP in the World Wide Web.
Describe JavaServer Pages and their relationship to servlets and J2EE generally.
Describe how a JSP is translated into a servlet and processed at runtime.
Explain the use of directives on JSPs and outline the principal directives.
Implement simple JSPs that use Java code in declarations, expressions and scriptlets.
Enumerate and use the implicit objects available to scripting elements.
Implement an interactive Web application using HTML forms and JSP.
Use Java exception handling and JSP error pages to handle errors in JSP applications.
Implement session management for a JSP application.
Manage cookies to store client-specific information at various scopes and durations.
Use JavaBeans to implement effective interactive JSP applications.
Describe custom tags in JSP and explain how they are implemented, both using Java and JSP itself, and how they are used.
Discuss threading issues in JSP and describe the use of directives to control how threading is handled.
Describe the various uses of XML in JSP applications.
Deploy a logical Web application to a Web server in a WAR file.
Describe the use of the JSP expression language to simplify dynamic page output.
Write JSP expressions and implement JSPs that use them in favor of scripts.
Implement JSPs that use basic JSTL actions to simplify presentation logic.
Decompose a JSP application design into fine-grained, reusable elements including JavaBeans, custom tag handlers and tag files that use JSTL.
Use core JSTL actions to complement standard actions, custom actions, and JSP expressions for seamless, script-free page logic.
Direct conditional and iterative processing of page content by looping through ranges of numbers, over elements in a collection, or over tokens in a master string.
Set locale and time zone information in JSPs, and use them to correctly format numbers, dates and times for all clients.
Use resource bundles to manage application strings, and produce the appropriate strings at runtime for a particular client locale.
Locate a data source, query for relational data, and parse result sets.
Perform updates, inserts and deletes on relational data using SQL actions.
Manage queries and updates in transaction contexts.
Derive information from parsed XML content using XPath expressions.
Implement conditional processing and loops based on XML information.
Apply XSLT transformations to XML content.
Implement a simple Web service that reads and writes SOAP.



Module 1. Introduction to JSP

Chapter 1. Web Applications

The World Wide Web
Web Servers
Dynamic Web Pages
Java Web Technologies

Chapter 2. JSP Architecture

JSP Containers
Servlet Architecture
Page Translation
Types of JSP Content
Content Type
Scripting Elements
JSP Expressions
Standard Actions
Custom Actions and JSTL
Objects and Scopes
Implicit Objects
JSP Lifecycle

Chapter 3. Scripting Elements

Translation of Template Content
Dos and Don'ts
Implicit Objects for Scriptlets
The request Object
The response Object
The out Object

Chapter 4. Interactive JSP Applications

HTML Forms
Reading CGI Parameters
JSPs and Java Classes
Error Handling
Session Management
The Session API
Cookies and JSP

Chapter 5. Using JavaBeans

Separating Presentation and Business Logic
JSP Actions
Working with Properties

Using Form Parameters with Beans
Objects and Scopes
Working with Vectors

Chapter 6. The Expression Language and the JSTL

Going Scriptless
The JSP Expression Language
EL Syntax
Type Coercion
Error Handling
Implicit Objects for EL
The JSP Standard Tag Library
Role of JSTL
The Core Actions
Using Beans with JSTL
The Formatting Actions
Scripts vs. EL/JSTL

Chapter 7. Advanced JSP Features

Web Components
Passing Parameters
Custom Tag Libraries
Tag Library Architecture
Implementing in Java or JSP
Strategies for Thread Safety
JSP for Web Services

Module 2. The JSP Standard Tag Library

Chapter 1. Effective JSTL

The JSP Standard Tag Library
JSTL Namespaces
Going Scriptless
Object Instantiation
Sharing Objects

Chapter 2. The Core Actions

The JSTL Core Library

Conditional Processing
Iterative Processing
Iterating Over Maps
Tokenizing Strings
Catching Exceptions
Resource Access

Chapter 3. The Formatting and i18n Actions

The JSTL Formatting Library
Determining Locale
Time Zones
Setting Locale and Time Zone
Formatting and Parsing Dates
Formatting and Parsing Numbers
Working with Resource Bundles
Supporting Multiple Languages

Chapter 4. The SQL Actions

The JSTL SQL Library
Using Relational Data
Connecting with a DriverManager
Connecting via a DataSource
The Result Interface
Making a Query
Inserts, Updates and Deletes
Parameterized SQL

Chapter 5. The XML Actions

The JSTL XML Library
Using XML
XML Data Sources
Parsing and Addressing
Using XPath in JSTL
XPath vs. EL
XPath Context
Implicit Objects for XPath
Conditional Processing
Iterative Processing
Changing XPath Context
Working with XML Namespaces
Using XSLT
Chaining Transformations
Reading XML from the Request Body
XML and SOAP Web Services

Appendix A. Learning Resources



Knowledge of HTML and background in Web applications will be helpful but is not strictly necessary. Deep Java experience is not required, but some familiarity with the language is recommended for some of the exercises.



Java developers.