Book Image

The Java Workshop

By : David Cuartielles, Andreas Göransson, Eric Foster-Johnson
3 (1)
Book Image

The Java Workshop

3 (1)
By: David Cuartielles, Andreas Göransson, Eric Foster-Johnson

Overview of this book

Java is a versatile, popular programming language used across a wide range of industries. Learning how to write effective Java code can take your career to the next level, and The Java Workshop will help you do just that. This book is designed to take the pain out of Java coding and teach you everything you need to know to be productive in building real-world software. The Workshop starts by showing you how to use classes, methods, and the built-in Collections API to manipulate data structures effortlessly. You’ll dive right into learning about object-oriented programming by creating classes and interfaces and making use of inheritance and polymorphism. After learning how to handle exceptions, you’ll study the modules, packages, and libraries that help you organize your code. As you progress, you’ll discover how to connect to external databases and web servers, work with regular expressions, and write unit tests to validate your code. You’ll also be introduced to functional programming and see how to implement it using lambda functions. By the end of this Workshop, you’ll be well-versed with key Java concepts and have the knowledge and confidence to tackle your own ambitious projects with Java.
Table of Contents (20 chapters)

Summary

This chapter introduces HTTP networking, which is often used to connect to RESTful web services from within Java applications. HTTP is a textual request-response protocol. A client sends a request to a server and then gets a response. Each HTTP request has a method; for instance, you would use the GET request to retrieve data, POST to send data, and so on. In Java applications, you will often send and receive text in JSON format.

The HttpUrlConnection class provides the primary way to make HTTP requests. Your code writes to an output stream to send data, then reads the response from an input stream. The open-source jsoup library provides a convenient API to retrieve and parse HTML data. Starting with Java 11, you can use the java.net.http module for a more modern Reactive Streams approach to HTTP networking. In the next chapter, you'll learn about certificates and encryption—both commonly used with HTTP networking.