SPRING/SPRING BOOT
Spring is a lightweight framework. It can be thought of as a framework of frameworks because it provides support to various frameworks such as Struts, Hibernate, Tapestry, EJB, JSF, etc. The framework, in a broader sense, can be defined as a structure where we find solutions to the various technical problems.
The Spring framework comprises several modules such as IOC, AOP, DAO, Context, ORM, WEB MVC, etc. We will learn these modules on the next page. Let's understand the IOC and Dependency Injection first.
Advantages of Spring Framework
There are many advantages of Spring Framework. They are as follows:
1) Predefined Templates
Spring framework provides templates for JDBC, Hibernate, JPA etc. technologies. So there is no need to write too much code. It hides the basic steps of these technologies.
Let's take the example of Jdbc Template, you don't need to write the code for exception handling, creating connection, creating statement, committing transaction, closing connection etc. You need to write the code of executing query only. Thus, it save a lot of JDBC code.
2) Loose Coupling
The Spring applications are loosely coupled because of dependency injection.
3) Easy to test
The Dependency Injection makes easier to test the application. The EJB or Struts application require server to run the application but Spring framework doesn't require server.
4) Lightweight
Spring framework is lightweight because of its POJO implementation. The Spring Framework doesn't force the programmer to inherit any class or implement any interface. That is why it is said non-invasive.
5) Fast Development
The Dependency Injection feature of Spring Framework and it support to various frameworks makes the easy development of JavaEE application.
6) Powerful abstraction
7) Declarative support
It provides declarative support for caching, validation, transactions and formatting.
Why Spring is Important?
Following is the list of few of the great benefits of using Spring Framework −
· Spring enables developers to develop enterprise-class applications using POJOs. The benefit of using only POJOs is that you do not need an EJB container product such as an application server but you have the option of using only a robust servlet container such as Tomcat or some commercial product.· Spring is organized in a modular fashion. Even though the number of packages and classes are substantial, you have to worry only about the ones you need and ignore the rest.· Spring does not reinvent the wheel, instead it truly makes use of some of the existing technologies like several ORM frameworks, logging frameworks, JEE, Quartz and JDK timers, and other view technologies.· Testing an application written with Spring is simple because environment-dependent code is moved into this framework. Furthermore, by using JavaBeanstyle POJOs, it becomes easier to use dependency injection for injecting test data.· Spring's web framework is a well-designed web MVC framework, which provides a great alternative to web frameworks such as Struts or other over-engineered or less popular web frameworks.· Spring provides a convenient API to translate technology-specific exceptions (thrown by JDBC, Hibernate, or JDO, for example) into consistent, unchecked exceptions.· Lightweight IoC containers tend to be lightweight, especially when compared to EJB containers, for example. This is beneficial for developing and deploying applications on computers with limited memory and CPU resources.· Spring provides a consistent transaction management interface that can scale down to a local transaction (using a single database, for example) and scale up to global transactions (using JTA, for example).
Important Concepts of Spring
1. Spring Core
2. Dependency Injection
3. Spring AOP
4. Spring JdbcTemplete
5. Spring ORM ( use of hibernate and jpa)
6. SPEL
7. Spring MVC
8. MVC Tiles
9. Spring Remoting
10. Spring Java Mail
11. Spring Web (stuts)
Application or uses of Spring/ Spring Boot
Following are the application/use of Spring
1. With Spring ,create Rest/Soap web api
2. You can create Secured Admin Dashboard
3. You can Create Smart /Useful web api’s for Multiplatform
Tools and Framework, libraries and packages
Spring is independent framework. It can integrate with any other java framework.
1. Spring with hibernate.
2. Spring with JPA
3. Spring with Java mail Api.
4. Spring with Any Front End Framework
Type of Services/development work
Spring Boot/Spring provide Web Service/ Web Rest/Soap Api. It can be integrate with any other application.
Project Ideas for Spring Framework
1.ReactJS Spring Boot CRUD Full Stack App (Employee Management System)
In this full-stack project, we will learn how to develop a simple end-to-end full-stack web application that is a basic Employee Management Application using React, Spring Boot.
We will build two projects:
1. sprintboot-backend (server) – To develop REST API
2. react-frontend (client) – Consume REST API
In this project, you will learn how to build a full-stack web application that is basic Employee Management Application with CRUD features:
· Create Employee
· List Employee
· Update Employee
· Delete Employee
· View Employee
2.Spring Boot MVC Web Application - Todo App
Spring MVC Todo Management web application using Spring Boot, Spring MVC, Spring Security, JSP, JPA, and MySQL as a database.
Tools and Technologies Used
Spring Boot - 2.0.4.RELEASE
JDK - 1.8 or later
Spring Framework - 5.0.8 RELEASE
Hibernate - 5.2.17. Final
Maven - 3.2+
Spring Data JPA - 2.0.10 RELEASE
IDE - Eclipse or Spring Tool Suite (STS)
MYSQL - 5.1.47
Spring Security - 5.0.7 RELEASE
JSP
3.Spring Boot Microservice Project - Shopping Cart App
This is a shopping cart application developed using Microservice Architecture with Spring Boot, Spring Cloud.
Here are the microservices:
catalog-service: It provides REST API to provide catalog information like products.
inventory-service: It provides a REST API to manage product inventory.
cart-service: It provides a REST API to hold the customer cart details.
order-service: It provides a REST API to manage orders.
customer-service: It provides a REST API to manage customer information.
shopping cart-ui: It is a customer-facing front-end web application.
4.Spring Boot Microservices, Spring Cloud and React Project - BookStoreApp
About this project
This is an E-commerce project, where users can adds books to the cart and buy those books. The application is being developed using Java, Spring, and React.
Using Spring Cloud Microservices and Spring Boot Framework extensively to make this application distributed.
Architecture
All the Microservices are developed using spring boot. This spring boot application will be registered with the eureka discovery server. FrontEnd React App makes requests to the NGINX server which acts as a reverse proxy. NGINX server redirects the requests to Zuul API Gateway. Zuul will route the requests to microservice based on the URL route. Zuul also registers with eureka and gets the IP/domain from eureka for microservice while routing the request.
5.Java Small Business Platform
This platform is built on Spring and Spring RC, allowing you an in-depth look into pure java implementation. It is a preferred choice for assembling desktop and business applications for small and medium-sized organizations. Additionally, the software is light, modular, and easy to scale, plug, and configure.
6.jRecruiter
If you are interested in learning about the intricate wirings of a web-based job-posting service, jRecruiter is for you. It is a showcase application that sheds light on a wide range of Java technologies. The Atlanta Java Users Group is an active user of this solution, which has been implemented using Spring, Struts 2, and Hibernate,
7.Create REST Service for an Education Site
On this challenge, you’ll create a REST service for a course-providing web site. REST is an abbreviation for Representational State Transfer, and to create these services; you’ll use Spring Boot. For instance, one service can ask for the courses a specific scholar signed up for, through the Get request methodology. Different service examples embrace asking for the scholars of a particular class, in addition to a request to register a scholar.
To finish this project, you’ll want Maven 3.0+, an IDE, and JDK 1.8+. You also needs to be aware of the Richardson Maturity Model as you’ll want that to establish the extent of maturity of your Restful Web Service. This project will enable you to get extra aware of REST and its implementation via Spring Boot. REST offers architectural constraints to services, that are known as RESTful providers. These constraints comprise of Cacheable outcomes (corresponding to HTTP cache), uniform URL, presence of a service shopper and producer, and statelessness. You need to use the Spring Web MVC as your web framework. To bootstrap this project (in addition to different Spring Boot projects), you should use Spring Initializr. You’d have to decide on the Group, the Artifact, and Web, Actuator, and DevTools as your dependencies there. Your service would require information too. For that function, you should use an in-memory retailer corresponding to “ArrayList”. You’ll additionally get accustomed to utilizing varied request strategies whereas finishing this undertaking since you’ll have to make use of GET, PUT, POST, and DELETE.
8. Create an Employee Administration System (Utilizing Spring Boot and Thymeleaf)
Through the use of Spring Boot and Thymeleaf, you’ll be able to construct an employee administration system for a company. However, for this, you have to be aware of the fundamental ideas of each of those technologies. The consumer of your EMS solution ought to have the ability to add an employee, view all staff, delete any employee, kind the information, and paginate. It’s a fairly complicated project which may take you a while to complete. Nonetheless, once you’re done, you’d be aware of the Thymeleaf CRUD, Spring Boot, and their varied functionalities in dealing with databases. You’ll have to make use of an IDE, Spring Data JPA, Spring Boot 2.2, Maven 3.2+, and Spring Framework 5.2. It is best to divide it into steps and full them one-by-one. Begin with organizing the database, after which start including the required options.
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