1.3.4 of April 17, 1999
Covers Servlet API versions 1.0, 2.0 and 2.1
This document explains the concepts of Java Servlets and provides
a step-by-step tutorial for writing HTTP Servlets with complete source
code for the example Servlets. The tutorial and the other chapters
cover all facets of Servlet programming from a simple "Hello World"
Servlet to advanced Servlet features like session tracking and Cookies.
There are also appendices on compiling and running Servlets.
The reader is assumed to have some basic knowledge of HTML and Java
Table of Contents
0.1 About this Document
This document is copyrighted © by
You may make an archival copy for personal use. Apart from that it may
not be redistributed in part or whole, in electronical, printed or any other
form without the author's prior written consent.
Java is a trademark of Sun Microsystems, Inc.
Netscape is a registered trademark of Netscape Communications Corporation.
All other trademarks mentioned belong to their respective owners.
The latest version of Servlet Essentials can be found online at
You can also download a complete archive, including all of the
Please send feedback to
The following changes have been made to this document since version 1.0.
Only major revisions are listed. Minor revisions (e.g. 1.0 -> 1.0.1 -> 1.0.2)
contain only corrections but no new material.
- New in Version 1.3
- Restructured the whole document. There are new sections "An Application for the
Command Pattern" and "Logging", a new
Glossary appendix, a new
Servlet API Changes
appendix and some minor additions to existing chapters. Several typos and
HTML errors have been corrected. Most of the visual design is now done with
Cascading Style Sheets (CSS1).
- New in Version 1.2
- Version 1.2 covers the new Servlet API version 2.1. Annotations about the
compatibility of the example programs and descriptions with the different
versions of the Servlet API have been added. There is a new section titled
"Accessing Server Resources".
- New in Version 1.1
- Apart from some minor corrections and extensions in the existing sections
version 1.1 contains a new section on
The "Image Servlet"
section has been moved to chapter 2. Several HTML errors were corrected in
the Java source code which was previously converted to colored HTML by hand.
New source code has been converted automatically with
Text with different meanings is rendered in different styles
throughout this document:
Normal text is displayed in this style.
Source code is displayed in this style.
Servlet API version compatibility issues are displayed in this style.
Features which require version 2.0 or 2.1 of the Servlet API are marked
with the or logo.
Links to explanations of words and abbreviations in the
are displayed in this style: RFC
Cascading Style Sheets are used for additional layout
and design information. You should use an HTML viewer which understands
CSS1 for the best results, but the document can still be used with older