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Home > Programming > Application Development > SPRING COOKBOOK
SPRING COOKBOOK
SPRING COOKBOOK

SPRING COOKBOOK: Over 100 hands-on recipes to build Spring web applications easily and efficiently

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SPRING COOKBOOK

Chapter 2. Defining Beans and Using Dependency Injection

In this chapter, we will cover the following recipes:

  • Defining a bean explicitly with @Bean
  • Defining a bean implicitly with @Component
  • Using a bean via dependency injection with @Autowired
  • Using a bean directly
  • Listing all beans
  • Using multiple configuration classes

Introduction

Beans are at the core of Spring. They are standard Java objects instantiated and managed by Spring.

Beans are mostly used to:

  • Configure Spring in some way (database connection parameters, security, and so on)
  • Avoid hardcoding dependencies using dependency injection, so that our classes remain self-contained and unit testable

In this chapter, you'll learn how to define beans and use them.

Defining a bean explicitly with @Bean

The simplest way to define a bean is to create, in a Spring configuration class, a method annotated with @Bean returning an object (the actual bean). Such beans are usually used to configure Spring in some way (database, security, view resolver, and so on). In this recipe, we'll define a bean that contains the connection details of a database.

How to do it…

In a Spring configuration class, add a dataSource() method annotated with @Bean and return a Datasource object. In this method, create a DriverManagerDataSource object initialized with the connection details of a database:

@Bean
public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/db1");
        dataSource.setUsername("root");
        dataSource.setPassword("123");
 ...

Defining a bean implicitly with @Component

Beans don't have to be defined in a Spring configuration class. Spring will automatically generate a bean from any class annotated with @Component.

Getting ready

We will use the basic web application created in the Creating a Spring web application recipe in Chapter 1, Creating a Spring Application.

Create the com.springcookbook.service package and the following service class in it:

public class UserService {
  public int findNumberOfUsers() {
    return 10;
  }
}

How to do it…

Here are the steps to define a bean by adding @Component to an existing class:

  1. In the Spring configuration file, in the @ComponentScan class annotation, add the com.springcookbook.service base package:
    @Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"com.springcookbook.controller", "com.springcookbook.service"})
public class AppConfig {  
}
  2. In the UserService class, add @Component:
    @Component
public class UserService {
  public int findNumberOfUsers...

Using a bean via dependency injection with @Autowired

Spring configuration beans, such as the one in the Defining a bean explicitly with @Bean recipe are automatically discovered and used by Spring. To use a bean (any kind of bean) in one of your classes, add the bean as a field and annotate it with @Autowired. Spring will automatically initialize the field with the bean. In this recipe, we'll use an existing bean in a controller class.

Getting ready

We will use the code from the Defining a bean implicitly with @Component recipe, where we defined a UserService bean.

How to do it…

Here are the steps to use an existing bean in one of your classes:

  1. In the controller class, add a UserService field annotated with @Autowired:
    @Autowired
UserService userService;
  2. In a controller method, use the UserService field:
    @RequestMapping("hi")
@ResponseBody
public String hi() {
  return "nb of users: " + userService.findNumberOfUsers();
}
  3. In a web browser, go to http://localhost:8080...

Using a bean directly

It's possible to get a bean directly from Spring instead of using dependency injection by making Spring's ApplicationContext, which contains all the beans, a dependency of your class. In this recipe, we'll inject an existing bean into a controller class.

Getting ready

We will use the code from the Defining a bean implicitly with @Component recipe, where we defined a UserService bean.

How to do it…

Here are the steps to get and use a bean directly:

  1. In the controller class, add an ApplicationContext field annotated with @Autowired:
    @Autowired
private ApplicationContext applicationContext;
  2. In a controller method, use the ApplicationContext object and its getBean() method to retrieve the UserService bean:
    UserService userService = (UserService)applicationContext.getBean("userService");

How it works…

When the controller class is instantiated, Spring automatically initializes the @Autowired field with its ApplicationContext object. The...

Listing all beans

It can be useful, especially for debugging purposes, to list all the beans at a given moment.

Getting ready

We will use the code from the Defining a bean implicitly with @Component recipe, where we defined a UserService bean.

How to do it…

Here are the steps to retrieve the names of the beans currently in Spring's ApplicationContext object:

  1. In your class, add an ApplicationContext field annotated with @Autowired:
    @Autowired
private ApplicationContext applicationContext;
  2. In a method of that class, use ApplicationContext and its getBeanDefinitionNames()method to get the list of bean names:
    String[] beans = applicationContext.getBeanDefinitionNames();
for (String bean : beans) {
  System.out.println(bean);
}

How it works…

When the controller class is instantiated, Spring automatically initializes the @Autowired field with its ApplicationContext object. The ApplicationContext object references all Spring beans, so we can get a list of all the beans that are using...

Introduction

Beans are at the core of Spring. They are standard Java objects instantiated and managed by Spring.

Beans are mostly used to:

  • Configure Spring in some way (database connection parameters, security, and so on)

  • Avoid hardcoding dependencies using dependency injection, so that our classes remain self-contained and unit testable

In this chapter, you'll learn how to define beans and use them.

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Page 1 of 8

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Description

This book is for you if you have some experience with Java and web development (not necessarily in Java) and want to become proficient quickly with Spring.

Who is this book for?

This book is for you if you have some experience with Java and web development (not necessarily in Java) and want to become proficient quickly with Spring.

What you will learn

  • Install Maven and Tomcat and create a Spring MVC web application
  • Display, validate, and process forms
  • Query a database with minimal code
  • Authenticate users and manage their roles
  • Build REST, Java RMI, and Hessian web services
  • Create and schedule batch jobs
  • Offer customized page layouts to mobiles and tablets
  • Exchange data with Facebook and Twitter

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 25, 2015
Length: 234 pages
Edition : 1st
Language : English
ISBN-13 : 9781783985814
Category :
Programming
Languages :
Java
Concepts :
Application Development
Tools :
Eclipse

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Publication date : May 25, 2015
Length: 234 pages
Edition : 1st
Language : English
ISBN-13 : 9781783985814
Category :
Programming
Languages :
Java
Concepts :
Application Development
Tools :
Eclipse

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Table of Contents

13 Chapters
1. Creating a Spring Application Chevron down icon Chevron up icon
1. Creating a Spring Application
Introduction
Installing Java, Maven, Tomcat, and Eclipse on Mac OS
Installing Java, Maven, Tomcat, and Eclipse on Ubuntu
Installing Java, Maven, Tomcat, and Eclipse on Windows
Creating a Spring web application
Running a Spring web application
Using Spring in a standard Java application
2. Defining Beans and Using Dependency Injection Chevron down icon Chevron up icon
2. Defining Beans and Using Dependency Injection
Introduction
Defining a bean explicitly with @Bean
Defining a bean implicitly with @Component
Using a bean via dependency injection with @Autowired
Using a bean directly
Listing all beans
Using multiple configuration classes
3. Using Controllers and Views Chevron down icon Chevron up icon
3. Using Controllers and Views
Introduction
Associating a route to a controller method
Using a JSP view
Passing attributes from a controller to a JSP view
Using dynamic route parameters in a controller method
Using a common prefix for the routes of a controller
Using a page template with Tiles
Executing some code before and after controllers using interceptors
Building multilingual pages
4. Querying a Database Chevron down icon Chevron up icon
4. Querying a Database
Introduction
Connecting to a database
Creating a DAO class
Calling a DAO method from a controller class
Saving an object
Retrieving an object
Retrieving a list of objects
Retrieving a list of objects with their dependencies
Updating an object
Deleting an object
Finding the number of results for an SQL query
Saving a list of objects at once
Reverting incomplete database modifications using transactions
Using Hibernate for powerful object persistence and querying
5. Using Forms Chevron down icon Chevron up icon
5. Using Forms
Introduction
Displaying and processing a form
Getting a submitted form value using a controller method argument
Setting a form's default values using a model object
Saving form data in an object automatically
Using text, textarea, password, and hidden fields
Using a select field
Using a checkbox
Using a list of checkboxes
Using a list of radio buttons
Validating a form using annotations
Uploading a file
6. Managing Security Chevron down icon Chevron up icon
6. Managing Security
Introduction
Enabling Spring Security
Authenticating users using the default login page
Authenticating users using a custom login page
Authenticating users using a database
Adding a logout link
Using public folders
Authorizing only users with a specific role to view some pages
Displaying page elements only to authenticated users in views
Using HTTPS with Tomcat
7. Unit Testing Chevron down icon Chevron up icon
7. Unit Testing
Introduction
Unit testing with JUnit 4
Unit testing with TestNG 6
Simulating dependencies with mocks using Mockito
Unit testing with JUnit 4 using Spring's application context
Unit testing with TestNG 6 using Spring's application context
Unit testing with transactions
Unit testing controller methods
8. Running Batch Jobs Chevron down icon Chevron up icon
8. Running Batch Jobs
Introduction
Installing and configuring Spring Batch
Creating a job
Executing a job from the command line
Executing a job from a controller method
Using job parameters
Executing a system command
Scheduling a job
Creating a read/process/write step
Reading an XML file
Generating a CSV file
Reading from a database
Unit testing batch jobs
9. Handling Mobiles and Tablets Chevron down icon Chevron up icon
9. Handling Mobiles and Tablets
Introduction
Installing Spring Mobile
Detecting mobiles and tablets
Switching to the normal view on mobiles
Using different JSP views for mobiles automatically
Using a .mobi domain name on mobiles
Using an m. subdomain on mobiles
Using a different domain name on mobiles
Using a subfolder path on mobiles
10. Connecting to Facebook and Twitter Chevron down icon Chevron up icon
10. Connecting to Facebook and Twitter
Introduction
Creating a Facebook app
Creating a test Facebook app and test users
Connecting to Facebook
Retrieving a Facebook user's profile
Retrieving the list of friends of a Facebook user
Posting a Facebook status update
Posting a link to Facebook
Posting a custom object to Facebook
Creating a Twitter application
Connecting to Twitter
Retrieving a user's Twitter profile
Retrieving the tweets of a Twitter user
Posting a tweet to Twitter
Sending a private message to another Twitter user
11. Using the Java RMI, HTTP Invoker, Hessian, and REST Chevron down icon Chevron up icon
11. Using the Java RMI, HTTP Invoker, Hessian, and REST
Introduction
Creating a Java RMI service
Querying an existing Java RMI service
Creating an HTTP Invoker service
Querying an existing HTTP Invoker service
Creating a Hessian service
Querying an existing Hessian service
Creating a REST service
Querying an existing REST service
12. Using Aspect-oriented Programming Chevron down icon Chevron up icon
12. Using Aspect-oriented Programming
Introduction
Creating a Spring AOP aspect class
Measuring the execution time of methods using an around advice
Logging method arguments using a before advice
Logging methods' return values using an after-returning advice
Logging exceptions using an after-throwing advice
Using an after advice to clean up resources
Making a class implement an interface at runtime using an introduction
Setting the execution order of the aspects
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
(3 Ratings)
5 star 66.7%
4 star 0%
3 star 0%
2 star 33.3%
1 star 0%
Tapuz Jul 12, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book covers a wide range of base usecases and situations a developer has to face every day with Spring.Examples are clear and concise and very useful both to junior programmers to find how to do something and to senior to use as reference or to have bases to modify for living code.Very useful tool for having in one place numerous code examples and save time and doubts .
Amazon Verified review Amazon
George Victor Jul 03, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
A nice book to learn the basics of spring framework. The recipes are concise and clear, and easy to follow. And covers a variety of topics such as spring security, mobile, social, AOP, UTs etc. Would have been even nicer if some really advanced recipes are also included, though I would give five stars for this book without a second thought for helping me in learning the basics of spring.
Amazon Verified review Amazon
han liu Jan 27, 2016
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
this book is not for new starter but some one with experience.(since it is named cookbook)there is no explanation of any concept and i found that most of time i have to do a lot of research in order to understand of the code.this cook book mostly use annotation.
Amazon Verified review Amazon

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About the authors

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Profile icon Jerome Jaglale
Jerome Jaglale
Jérôme Jaglale is a web developer based in Vancouver, Canada. He has spent the last 10 years working with several web frameworks, including Struts, CodeIgniter, and Laravel, and doing frontend work with CSS and JavaScript that is focused on user experience. He's currently working at Simon Fraser University on a prototype of iReceptor, a scientific gateway federating immune genetics databases in order to help researchers answer complex questions about immune response.
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Profile icon Yilmaz
Yilmaz
Murat Yilmaz is a software developer and an online entrepreneur who lives in Antalya, Turkey. He has over 10 years of experience in different IT fields, including development of web-driven solutions, large databases, and OLAP systems. He has worked in several multinational companies in Istanbul and Moscow as a consultant. He currently runs his own blog and an e-commerce and online advertising network. He holds a bachelor's degree in Computer Science from Marmara University at Istanbul. He spends his free time playing progressive rock songs, online chess, and reading scientific books.He has also authored two other books, OpenCart 1.4: Beginner's Guide and OpenX Ad Server: Beginner's Guide.
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Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.