SPRING COOKBOOK

Book Image

SPRING COOKBOOK

Book Image

SPRING COOKBOOK

Overview of this book

Spring Cookbook

Spring Cookbook

Credits

About the Author

About the Author

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Free Chapter

Creating a Spring Application

Creating a Spring Application

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

Defining Beans and Using Dependency Injection

Defining Beans and Using Dependency Injection

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

Using Controllers and Views

Using Controllers and Views

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

Querying a Database

Querying a Database

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

Using Forms

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

Managing Security

Managing Security

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

Unit Testing

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

Running Batch Jobs

Running Batch Jobs

Installing and configuring Spring Batch

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

Handling Mobiles and Tablets

Handling Mobiles and Tablets

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

Connecting to Facebook and Twitter

Connecting to Facebook and Twitter

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

Using the Java RMI, HTTP Invoker, Hessian, and REST

Using the Java RMI, HTTP Invoker, Hessian, and REST

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

Using Aspect-oriented Programming

Using Aspect-oriented Programming

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

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Creating a DAO class

In this recipe, we will create a DAO (data access object) class. A DAO class provides methods to save and retrieve objects from the database. It can be used from a controller, for example:

The controller calls the findUsers() method from UserDAO, which takes care of getting the results from the database (using the JdbcTemplate bean defined in the previous recipe).

How to do it…

Here are the steps to create a DAO class:

Create a class annotated with @Repository:
```
@Repository
public class UserDAO {
```

Add an autowired JdbcTemplate field to it:

@Autowired
private JdbcTemplate jdbcTemplate;

How it works…

@Repository allows the UserDAO class to be automatically discovered and instantiated as a bean.

The JdbcTemplate field will be initialized automatically by Spring via dependency injection with the JdbcTemplate bean defined in the previous recipe.