Book Image

Learning Network Programming with Java

Book Image

Learning Network Programming with Java

Overview of this book

Network-aware applications are becoming more prevalent and play an ever-increasing role in the world today. Connecting and using an Internet-based service is a frequent requirement for many applications. Java provides numerous classes that have evolved over the years to meet evolving network needs. These range from low-level socket and IP-based approaches to those encapsulated in software services. This book explores how Java supports networks, starting with the basics and then advancing to more complex topics. An overview of each relevant network technology is presented followed by detailed examples of how to use Java to support these technologies. We start with the basics of networking and then explore how Java supports the development of client/server and peer-to-peer applications. The NIO packages are examined as well as multitasking and how network applications can address practical issues such as security. A discussion on networking concepts will put many network issues into perspective and let you focus on the appropriate technology for the problem at hand. The examples used will provide a good starting point to develop similar capabilities for many of your network needs
Table of Contents (16 chapters)
Learning Network Programming with Java
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Handling cookies


A cookie is a string containing a key/value pair representing information of interest to the server such as user preferences. It is sent from a server to a browser. The browser should save the cookie to a file so that it can be used later.

A cookie is a string that consists of a name followed by an equal sign and then a value. The following is one possible cookie:

userID=Cookie Monster

A cookie can have multiple values. These values will be separated by a semicolon and white space.

We will use the HTTPServer class and the HttpURLConnection classes to demonstrate the handling of cookies. In the MyHTTPServer class server's handler class's handle method, add the following code after the other headers:

    responseHeaders.set("Set-cookie", "userID=Cookie Monster");

When the server responds, it will send that cookie.

In the HttpURLConnectionExample class's getResponse method, add the following code at the beginning of its try block. A string is built containing the cookie text. Multiple...