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• Spring Framework Interview Questions
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Feb 18, 2018 February 18, 2018. Getting Started With Spring Framework Pdf Free 11 - DOWNLOAD (Mirror #1) bb84b2e1ba Getting Started With Spring Framework Pdf.Pdf - eBook and.Free PDF ebooks (user's guide, manuals, sheets) about Getting started with spring framework pdf ready for downloadGetting started with Spring Framework, Second Edition.getting-started. Getting started with Spring Framework, Second Edition includes new chapters on Spring Web MVC, RESTful Web Services and Spring Security. This book is meant for Java developers with little or no knowledge of Spring Framework. All the examples shown in this book use Spring 4. Getting started with Spring Framework is a hands-on guide to begin developing applications using Spring Framework. The examples (consisting of 74 sample projects ) that accompany this book are based on Spring 4.3 and Java 8. Getting Started with Spring Framework-J. Sharma 2012-12-10 Getting started with Spring Framework is a hands-on guide to begin developing applications using Spring Framework. This book is meant for Java developers with little or no knowledge of Spring Framework.

Remarks

The Spring Framework is an open source application framework and inversion of control container for the Java platform.

Versions

Version	Release Date
4.3.x	2016-06-10
4.2.x	2015-07-31
4.1.x	2014-09-14
4.0.x	2013-12-12
3.2.x	2012-12-13
3.1.x	2011-12-13
3.0.x	2009-12-17
2.5.x	2007-12-25
2.0.x	2006-10-04
1.2.x	2005-05-13
1.1.x	2004-09-05
1.0.x	2003-03-24

Setup (XML Configuration)

Steps to create Hello Spring:

0. Investigate Spring Boot to see if that would better suit your needs.
1. Have a project set up with the correct dependencies. It is recommended that you are using Maven or Gradle.
2. create a POJO class, e.g. Employee.java
3. create a XML file where you can define your class and variables. e.g beans.xml
4. create your main class e.g. Customer.java
5. Include spring-beans (and its transitive dependencies!) as a dependency.

Employee.java :

beans.xml :

Customer.java :

Showcasing Core Spring Features by example

Description

This is a self-contained running example including/showcasing: minimum dependencies needed, Java Configuration, Bean declaration by annotation and Java Configuration, Dependency Injection by Constructor and by Property, and Pre/Post hooks.

Dependencies

These dependencies are needed in the classpath:

Main Class

Starting from the end, this is our Main class that serves as a placeholder for the main() method which initialises the Application Context by pointing to the Configuration class and loads all the various beans needed to showcase particular functionality.

Application Configuration file

The configuration class is annotated by @Configuration and is used as a parameter in the initialised Application Context. The @ComponentScan annotation at the class level of the configuration class points to a package to be scanned for Beans and dependencies registered using annotations. Finally the @Bean annotation serves as a bean definition in the configuration class.

Bean Declaration by Annotation

The @Component annotation serves to demarcate the POJO as a Spring bean available for registration during component scanning.

Bean Declaration by Application Configuration

Notice that we don't need to annotate or otherwise mark our POJO since the bean declaration/definition is happening in the Application Configuration class file.

Constructor Injection

Notice that the @Autowired annotation is set at the constructor level. Also notice that unless explicitely defined by name the default autowiring is happening based on the type of the bean (in this instance BeanToBeInjected ).

Property Injection

Notice that the @Autowired annotation demarcates the setter method whose name follows the JavaBeans standard.

PostConstruct / PreDestroy hooks

We can intercept initialisation and destruction of a Bean by the @PostConstruct and @PreDestroy hooks.

What is Spring Framework, why should we go for it ?

Spring is a framework, which provides bunch of classes, by using this we don't need to write boiler plate logic in our code, so Spring provides an abstract layer on J2ee.

For Example in Simple JDBC Application programmer is responsible for

1. Loading the driver class
2. Creating the connection
3. Creating statement object
4. Handling the exceptions
5. Creating query
6. Executing query
7. Closing the connection

Which is treated as boilerplate code as every programmer write the same code. So for simplicity the framework takes care of boilerplate logic and the programmer has to write only business logic. So by using Spring framework we can develop projects rapidly with minimum lines of code, without any bug, the development cost and time also reduced.

So Why to choose Spring as struts is there

Strut is a framework which provide solution to web aspects only and struts is invasive in nature. Spring has many features over struts so we have to choose Spring.

1. Spring is Noninvasive in nature: That means you don't need to extend any classes or implement any interfaces to your class.
2. Spring is versatile: That means it can integrated with any existing technology in your project.
3. Spring provides end to end project development: That means we can develop all the modules like business layer, persistence layer.
4. Spring is light weight: That means if you want to work on particular module then , you don't need to learn complete spring, only learn that particular module(eg. Spring Jdbc, Spring DAO)
5. Spring supports dependency injection.
6. Spring supports multiple project development eg: Core java Application, Web Application, Distributed Application, Enterprise Application.
7. Spring supports Aspect oriented Programming for cross cutting concerns.

So finally we can say Spring is an alternative to Struts. But Spring is not a replacement of J2EE API, As Spring supplied classes internally uses J2EE API classes. Spring is a vast framework so it has divided into several modules. No module is dependent to another except Spring Core. Some Important modules are

1. Spring Core
2. Spring JDBC
3. Spring AOP
4. Spring Transaction
5. Spring ORM
6. Spring MVC

Through this article, you will learn how to implement PDF export functionality for a Spring Boot application with OpenPDF (LibrePDF) is the Java library chosen for generating PDF documents. The code examples below demonstrate this scenario: the users click Export to PDF link and then the application will retrieve the requested information from the database, and generate a PDF document to the browser which will download the PDF file.Suppose that we have an existing Spring Boot application that makes use of Spring Data JPA and Hibernate for the data access layer, Thymeleaf for the view and MySQL as the database.

1. Code for the Data Access layer

We will develop a function that allows the users to export information about users from the database to a PDF document. So we have the Userentity class that maps to the users table in the database, as shown below:And the Roleentity class that maps to the roles table in the database:The fields will be included in the generated PDF document are: User ID, E-mail, Full Name, Roles and Enabled.And code of the respective repository interfaces looks like this:These are simple, typical repositories as required by Spring Data JPA.

2. Declare Dependency for PDF Library

To generate a PDF document, we need to use an external Java PDF library such as OpenPDF. So declare the following dependency in the project’s pom.xml file:

3. Code for the Service layer

In the service layer, code the UserServicesclass as belowAs you can see, the listAll() method returns a List collection of User objects from the database. It delegates the call UserRepository’s findAll() method which will be implemented by Spring Data JPA at runtime.

4. Code PDF Exporter Class

Next, code a separate class that is responsible to generate a PDF document based on the input is a List collection of User objects, as shown below:This class will create a PDF representing the information about users in table format, with table header consists of these columns: User ID, E-mail, Full Name, Roles and Enabled.Pay attention to the export() method that takes an HttpServletRespone as the argument, because it will write the content of the PDF file into the output stream of the response, so the clients (web browsers) will be able to download the exported PDF document.

5. Code Handler method in the Controller Class

Next, implement a handler method in a Spring MVC controller class – UserController – as follows:As you can see, the exportToPDF() method will serve HTTP GET request with the URI /users/export/pdf. It will use the

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UserServices class to get data of users from the database, and use the UserPDFExporter class to write a PDF document to the response.Also notice name of the generated PDF file is appended with the current date time, making it’s easier for the users to track multiple versions of files downloaded.

6. Add Export PDF Link in the View layer

We use HTML and Thymeleaf to create a hyperlink that allows the user to click to export data to PDF as follows:

7. Test Export and Download PDF document

Click the hyperlink Export to PDF, the Spring Boot application will generate an PDF file and the browser will automatically download that file. The file name is something like this: users_2020-09-04_10_47_46.pdf. Open this file using a PDF reader application (or view right in the browser), you would see the following screen:

Conclusion

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So far you have learned how to implement PDF export functionality for a Spring Boot web application. You see, Spring Data JPA makes it easy to get data from the database, and OpenPDF makes it easy to generate PDF documents.For video version of this tutorial, watch the video below:

Spring Framework Interview Questions

Related Tutorials:

Other Spring Boot Tutorials:

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