In this chapter, you learnt the structure of web programming. This was not possible without understanding the basics of TCP/IP networking, which is the protocol of the Internet. The application level protocol that is used over that is HTTP, currently in a very new version 2.0, which is still not supported by the servlet standard. We created a version of the Mastermind game that, this time, can really be played using the browser and we started it in a development environment using Jetty. We examined how to store the game state and implemented two versions. Finally, we learned the basics of logging and we looked at other technologies. At the same time, we also looked at the dependency injection implementation Guice from Google, and we studied how it works under the hood, and why and how to use it.

After this chapter, you will be able to start the development of a web application in Java and will understand the architecture of such a program. You will understand what is under the hood when you start learning how to program web applications using the Spring framework, which hides many of the complexities of web programming.