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Madhusudhan Konda - Just Spring

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Book:
Just Spring
Author:
Madhusudhan Konda
Publisher:
OReilly Media
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Books / Computer
Year:
2011
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Get a concise introduction to Spring, the increasingly popular open source framework for building lightweight enterprise applications on the Java platform. This example-driven book for Java developers delves into the frameworks basic features, as well as advanced concepts such as containers. Youll learn how Spring makes Java Messaging Service easier to work with, and how its support for Hibernate helps you work with data persistence and retrieval. Throughout Just Spring, youll get your hands deep into sample code, beginning with a problem that illustrates dependency injection, Springs core principle. In the chapters that follow, author Madhusudhan Konda walks you through features that underlie the solution.Learn dependency injection through a simple object coupling problem, along with different injection types Tackle the frameworks core fundamentals, including beans and bean factories Dive into containers and other advanced concepts, such as event handling and autowiring beans Discover how Spring makes the Java Messaging Service API easier to use Learn how Spring has revolutionized data access with Java DataBase Connectivity (JDBC) Use Spring with the Hibernate framework to manipulate data as objects

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Just Spring

Madhusudhan Konda

Editor

Mike Loukides

OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (.

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While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.

OReilly Media Preface Conventions Used in This Book The following - photo 1

O'Reilly Media

Preface

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, email addresses, filenames, and file extensions.

Constant width

Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.

Constant width bold

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Constant width italic

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Using Code Examples

This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Just Spring by Madhusudhan Konda (OReilly). Copyright 2011 Madhusudhan Konda, 978-1-449-30640-3.

If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .

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Acknowledgments

I sincerely wish to thank my editor, Mike Loukides, for keeping faith in me and directing me when lost. Also to all of those in the OReilly team, especially Meghan Blanchette, Holly Bauer, Sarah Schneider. and Dan Fauxsmith, for helping shape this book.

Sincere thanks to my loving wife, Jeannette, for being very patient and supportive throughout the writing of this book. Also to my wonderful four-year-old son, Joshua, who surprisingly sacrificed his free time, allowing me to write when I explained to him what I was doing!

Chapter 1. Spring Basics

Introduction

The Spring Framework has found a very strong user base over the years. Software houses and enterprises found the framework to be the best fit for their plumbing needs. Surprisingly, the core principle that Spring has been built forthe Dependency Injection (DI)is very simple to understand. This chapter discusses the fundamentals of the framework from a high ground. It helps the reader understand the dependency injection principles. The chapter opens up with a simple problem of object coupling and dependencies. It then explains how to solve the them using Spring Framework.

Object Coupling Problem

Let us consider a simple program whose objective is to read data from various data sources. It can read data from a file system or database or even from an FTP server. For simplicity, we will start writing a program that reads the data from a file system for now. The following example code is written without employing any best practices or dependency injection patternsits just a simple and plain program that works.

shows a Client program that uses FileReader to fetch the data.

Example 1-1.

public class DataReaderClient { private FileReader fileReader = null; private String fileName = "res/myfile.txt"; public DataReaderClient() { fileReader = new FileReader(fileName); } private String fetchData() { return fileReader.read(); } public static void main(String[] args) { DataReaderClient dataReader = new DataReaderClient(); System.out.println("Got data: "+dataReader.fetchData()); }}

As the name suggests, the DataReaderClient is the client that fetches the data from a data source. When the program is executed, the DataReaderClient gets instantiated along with a referenced FileReader object. It then uses the FileReader object to fetch the result.

is the implementation of FileReader class.

Example 1-2.

public class FileReader { private StringBuilder builder = null; private Scanner scanner = null; public FileReader(String fileName) { scanner = new Scanner(new File(fileName)); builder= new StringBuilder(); } public String read() { while (scanner.hasNext()) { builder.append(scanner.next()); } return builder.toString(); }}

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