Programming WebLogic HTTP Servlets

Overview of HTTP Servlets

What Is a Servlet?

What You Can Do with Servlets

Overview of Servlet Development

Servlets and J2EE

HTTP Servlet API Reference

Introduction to Programming

Writing a Simple HTTP Servlet

Advanced Features

Complete HelloWorldServlet Example

Programming Tasks

Initializing a Servlet

Initializing a Servlet when WebLogic Server Starts

Overriding the init() Method

Providing an HTTP Response

Retrieving Client Input

Methods for Using the HTTP Request

Example: Retrieving Input by Using Query Parameters

Securing Client Input in Servlets

Using a WebLogic Server Utility Method

Session Tracking from a Servlet

A History of Session Tracking

Tracking a Session with an HttpSession Object

Lifetime of a Session

How Session Tracking Works

Detecting the Start of a Session

Setting and Getting Session Name/Value Attributes

Logging Out and Ending a Session

Using session.invalidate() for a Single Web Application

Implementing Single Sign-On for Multiple Applications

Exempting a Web Application for Single Sign-on

Configuring Session Tracking

Using URL Rewriting Instead of Cookies

URL Rewriting and Wireless Access Protocol (WAP)

Making Sessions Persistent

Scenarios to Avoid When Using Sessions

Use Serializable Attribute Values

Configuring Session Persistence

Using Cookies in a Servlet

Setting Cookies in an HTTP Servlet

Retrieving Cookies in an HTTP Servlet

Using Cookies That Are Transmitted by Both HTTP and HTTPS

Application Security and Cookies

Response Caching

Initialization Parameters

Using WebLogic Services from an HTTP Servlet

Accessing Databases

Connecting to a Database Using a JDBC Connection Pool

Using a Connection Pool in a Servlet

Connecting to a Database Using a DataSource Object

Using a DataSource in a Servlet

Connecting Directly to a Database Using a JDBC Driver

Threading Issues in HTTP Servlets

SingleThreadModel

Shared Resources

Dispatching Requests to Another Resource

Forwarding a Request

Including a Request

Best Practice When Subclassing ServletResponseWrapper

Proxying Requests to Another Web Server

Overview of Proxying Requests to Another Web Server

Setting Up a Proxy to a Secondary Web Server

Sample Deployment Descriptor for the Proxy Servlet

Administration and Configuration

Overview of WebLogic HTTP Servlet Administration

Using Deployment Descriptors to Configure and Deploy Servlets

web.xml (Web Application Deployment Descriptor)

weblogic.xml (Weblogic-Specific Deployment Descriptor)

WebLogic Server Administration Console

Directory Structure for Web Applications

Referencing a Servlet in a Web Application

URL Pattern Matching

Servlet Security

Authentication

Authorization (Security Constraints)

Servlet Development Tips

Clustering Servlets