Contents

List of Figures

List of Tables

Title and Copyright Information

Send Us Your Comments

Preface

Documentation Accessibility

Related Documentation

1 Summary of What to Know About Servlets

Summary of Servlet and J2EE Technology

The Essence of Servlets

Why Use Servlets?

Servlet Lifecycle

JSP Pages and Other J2EE Component Types

Key Components and APIs of the Servlet Model

Key Methods of the Servlet Interface

Servlet Communication: Request and Response Objects

Key Methods of the HttpServletRequest Interface

Key Methods of the HttpServletResponse Interface

Servlet Execution in the Servlet Container

Servlet Configuration Objects

Obtaining a Servlet Configuration Object

Key Servlet Configuration Methods

Servlet Contexts: the Application Container

Servlet Context Basics

Obtaining a Servlet Context

Key Servlet Context Methods

What are Servlet Sessions (User Sessions) Used For?

Servlet Thread Models

Servlet Feature Table

2 Developing Servlets

Writing a Basic Servlet

When to Implement Methods of the Servlet Interface

When to Override the init() Method

When to Override the doGet() or doPost() Method

When to Override the doPut() Method

When to Override the doDelete() Method

When to Override the getServletInfo() Method

When to Override the destroy() Method

Setting Up the Response

Step-by-Step Through a Simple Servlet

Simple Servlet Example

Write the Sample Code

Compile the Sample Code

Using HTML Forms and Request Parameters

Using an HTML Form for User Input

Displaying Request Parameter Data Specified in User Input

Complete Example Using a Form and Request Parameters

Using the POST Method for URL Security

Calling Information Methods of the Request Object

Complete Example Retrieving Request Information

Dispatching to Other Servlets Through Includes and Forwards

Basics of Includes and Forwards

Why Use Includes and Forwards?

Step-by-Step Through the Include or Forward Process

Complete Example of a Servlet Include

When to Use Filters for Pre-Processing and Post-Processing

When to Use Event Listeners for Servlet Notification

3 Deploying and Invoking Servlets

Initial Considerations and OC4J Scenarios

A Brief Overview of OC4J Administration

OC4J in a Standalone Versus Oracle Application Server Environment

OC4J and Oracle Application Server Administration Tools

Summary of URL Components

Deploying a Web Application to OC4J

Application Structure

Summary of General Steps to Deploy a WAR File

Summary of General Steps to Deploy an EAR File

Invoking a Servlet in OC4J

Invoking a Servlet in a Standalone OC4J Environment

Invoking a Servlet by Class Name During OC4J Development

Invoking a Servlet in an Oracle Application Server Environment

Deploying and Invoking the Simple Servlet Example

Deploy the Servlet Example as a WAR File

Create the web.xml File

Create the WAR File

Deploy the WAR File and Bind the Web Application

Deploy the Servlet Example as an EAR File

Create the web.xml File and WAR file.

Create the application.xml File

Create the EAR File

Deploy the EAR File and Bind the Contained Web Application

Invoke the Servlet Example

Preloading Servlets

4 Understanding and Using Servlet Sessions

Overview of Session Tracking

Session Objects

Cookies and Persistent Session Data

When to Use Cookies Versus Session Attributes

Using Session Tracking in OC4J

Configuring Session Tracking and Enabling or Disabling Cookies in OC4J

How OC4J Can Use Cookies for Session Tracking

Using URL Rewriting for Session Tracking

Session Tracking Through Secured Connections

Using a Session Object in Your Servlet

Summary of HttpSession Methods

Adding and Retrieving Session Attributes

Session Object Example

Using Cookies in Your Servlet

Configuring Cookies

Summary of Cookie Methods

Retrieving, Displaying, and Adding Cookies

Canceling a Session

Using a Timeout to Cancel a Session

Explicitly Canceling a Session

5 Understanding and Using Servlet Filters

Overview of How Filters Work

How the Servlet Container Invokes Filters

Typical Filter Actions

Standard Filter Interfaces

Methods of the Filter Interface

Method of the FilterChain Interface

Methods of the FilterConfig Interface

Implementing and Configuring Filters

Implement the Filter Code

Configure the Filter

Construction of the Filter Chain

Simple Filter Example

Write the Simple Filter Code

Write the Target JSP Page

Configure the Simple Filter

Package the Simple Filter Example

Invoke the Simple Filter Example

Filtering Forward or Include Targets

The web.xml <dispatcher> Element

Configuring Filters for Forward or Include Targets

Using a Filter to Wrap and Alter the Request or Response

Response Filter Example

Write the Custom Output Stream Code

Write the Response Wrapper Code

Write the Base Filter Code

Write the Response Filter Code

Write the Target HTML Page

Configure the Response Filter

Package the Response Filter Example

Invoke the Response Filter Example

6 Understanding and Using Event Listeners

Overview of How Event Listeners Work

Event Listener Interfaces

ServletContextListener Methods, ServletContextEvent Class

ServletContextAttributeListener Methods, ServletContextAttributeEvent Class

HttpSessionListener Methods, HttpSessionEvent Class

HttpSessionAttributeListener Methods, HttpSessionBindingEvent Class

HttpSessionActivationListener Methods

HttpSessionBindingListener Methods

ServletRequestListener Methods, ServletRequestEvent Class

ServletRequestAttributeListener Methods, ServletRequestAttributeEvent Class

Implementing and Configuring Event Listeners

Implement the Listener Code

Configure the Listener

Session Lifecycle Listener Example

Write the JSP Welcome Page

Write the Session Creation Servlet

Write the Session Invalidation Servlet

Write the Session Lifecycle Listener Code

Configure the Session Lifecycle Listener Example

Package the Session Lifecycle Listener Example

Invoke the Session Lifecycle Listener Example

7 Using JDBC or Enterprise JavaBeans

Using JDBC in Servlets

Configuring a Data Source and Resource Reference

Configure the Data Source

Configure the Resource Reference

Implementing JDBC Calls

Database Query Servlet Example

Configure the Data Source for the Query Servlet

Write the HTML Welcome Page

Write the Query Servlet

Configure the Servlet and JNDI Resource Reference

Package the Query Example

Invoke the Query Example

Overview of Enterprise JavaBeans

Why Use Enterprise JavaBeans?

EJB Support in OC4J and Oracle Application Server

Servlet-EJB Lookup Scenarios

EJB Local Interfaces Versus Remote Interfaces

Using the Remote Flag for Remote Lookup within the Same Application

8 Best Practices and Performance

Best Practices for Sessions

Best Practices for Security

Considerations for Thread Models

Best Practices for Performance

Monitoring Performance

Oracle Application Server Dynamic Monitoring Service

A Web Module Administration

Application Server Control Console Top-Level Web Module Pages

How to Get to a Web Module Home Page

Summary of Top-Level Web Module Pages

Application Server Control Web Module Configuration Pages

Configuration Properties Page

Deployment Descriptor Viewing Pages

Servlet Mappings Page

Filter Mappings Page

Resource Reference Mappings Page

EJB Reference Mappings Page

Environment Entry Mappings Page

Resource Reference Lookup Context Page

Summary of Web Module MBeans and Administration

General Overview of OC4J MBean Administration

Summary of OC4J Web Module MBeans

B Web Module Configuration Files

Overview of Web Application Configuration Files

Standard web.xml Configuration File

Oracle global-web-application.xml Configuration File

Oracle orion-web.xml Configuration File

Summary of Relationship Between Web Application Configuration Files

Hierarchy of orion-web.xml and global-web-application.xml

Elements and Attributes of orion-web.xml, global-web-application.xml

<context-attribute>

<context-param-mapping>

<ejb-ref-mapping>

<env-entry-mapping>

<expiration-setting>

<lookup-context>

<mime-mappings>

<orion-web-app>

<request-tracker>

<resource-env-ref-mapping>

<resource-ref-mapping>

<security-role-mapping>

<service-ref-mapping>

<servlet-chaining>

<session-tracker>

<session-tracking>

<virtual-directory>

<web-app-class-loader>

C Third Party Licenses

The ANTLR License

The Apache Software License

Apache SOAP License

Index