Spring Boot 3 | Curso Completo 2023

Building a RESTful API with Spring Boot

In this video, Michelli Brito will guide us through building a RESTful API using the new versions of Spring Boot. She introduces the Spring ecosystem and its various projects that we can use on a daily basis in our Java application development.

Introduction to Spring Ecosystem

• Michelli introduces the Spring ecosystem and its various projects.

• She talks about some of the main projects that make up this ecosystem, such as Spring Boot, Spring Security, and spring data.

• The ecosystem involves several different projects that allow us to explore this ecosystem in our ABA applications.

• The foundation of the entire ecosystem is the Spring Framework which makes all of this possible.

About Spring Boot

• Michelli talks about how we can use Spring Boot at the start of an application where we can create everything from a web application to each of the Microservices.

• With Spring Boot, many initial configurations are already ready by default so we can quickly start implementing business rules.

• In short, we have a start and ease in creating Java applications with the Spring ecosystem.

Conclusion

In conclusion, Michelli Brito has provided an overview of building a RESTful API using new versions of Spring Boot. She introduced us to the various projects that make up the entire ecosystem and talked about how we can use them in our Java application development. Finally, she explained how we can use Spring Boot at the start of an application for faster implementation.

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Introduction to Spring Framework

In this section, the speaker introduces the Spring Framework and its ecosystem. They discuss how it can be used to create various projects and outline the different modules that make up the framework.

The Spring Framework

• The Spring Framework is a popular Java-based framework used for building web applications.

• It includes many different projects, with the core project being the Spring Framework.

• Other modules include Data Access Web, Bean Core, Context, and more.

• The framework uses inversion of control and dependency injection to manage dependencies between components.

Maturity Model

• The speaker discusses Leonard Richardson's maturity model for RESTful APIs.

• Level 0 involves using HTTP protocol while level 1 includes defining resources using nouns.

• Level 2 involves using HTTP methods semantically while level 3 adds hypermedia controls.

Best Practices

• The speaker emphasizes best practices when defining resources in a RESTful API.

• They discuss how to use appropriate HTTP methods for each action (e.g. POST for creating a resource).

• Using nouns in URI design is also recommended.

Conclusion

• Overall, the Spring Framework provides an efficient way to build web applications with its many modules and best practices.

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Implementing Reading Methods

In this section, the speaker discusses implementing reading methods in the CRUD application using Spring Boot. They also mention customizing error messages and inserting custom validation.

Implementing GET Method for Listing Products

• The speaker introduces implementing the reading methods in the CRUD application.

• They discuss listing all products using the GET method and including metadata such as Help.

• The speaker mentions displaying specific messages to clients when they make a mistake or omit a field.

• They give an example of displaying an error message indicating which field is missing or incorrect.

Other Improvements

• The speaker suggests other improvements such as customizing errors and inserting custom validation.

• They mention selecting the version of Java and packaging type for the project.

Adding Dependencies to Project

In this section, the speaker discusses adding dependencies to a project using Spring Boot.

Selecting Dependencies

• The speaker introduces selecting dependencies for building a RESTful API with Spring Boot.

• They mention selecting dependencies for PostgreSQL, H2, Validation, and Web Starter.

• The speaker suggests using H2 if not wanting to install PostgreSQL on local machine.

Previewing Project

• The speaker shows how to preview selected dependencies in Super Initialize.

• They show how to view files, guides, and documentation related to selected dependencies.

Conclusion

In conclusion, this transcript covers implementing reading methods in a CRUD application using Spring Boot. It also discusses adding dependencies to a project using Spring Boot. The speaker suggests customizing error messages and inserting custom validation as improvements.

Generating a Project

In this section, the speaker discusses generating a project.

• The speaker mentions that they will generate a project.

Creating Returns in Controller

In this section, the speaker discusses creating returns in the controller.

• The speaker mentions using classes, validations and customizations for creating returns. For now, they will create these returns within the controller itself. They upload the application to test this method.

• The speaker talks about getting an "and", which is also a read method. They have already uploaded the application.

• The speaker takes one of the resources and tries to get it by passing its ID through the URL bar products bar. If it exists, it returns data of that specific resource.

• If a resource does not exist, it just returns an HTTP not found status saying that this product doesn't exist.

Implementing Update Method

In this section, the speaker discusses implementing an update method.

• The next method is the update method or Put Update Product method which is similar to Get o and product implemented earlier but with some differences such as defining what is ID of that resource we want to update etc..

• They use @put map here semantically with http there will also be a return response before is of type Object with different returns for different situations and our update product so here it will receive profile and ID coming from URI along with body request containing name and value parameters to be updated.

• The speaker mentions that they will check if the resource exists before updating it. If it does not exist, they will return an HTTP not found status saying that this product doesn't exist. They use @vet for validation.

• They start a fashion product to be updated in the database and assign the value that they have already received from the database because the ID of this resource is already populated, it already exists. They convert the updated fields of our clipping, conversion of DT to our product mode and after that save this product using it also in save but remembering passing the same ID so that another resource is not created but just updated that resource which already exists. In response, they set up resulting states and send the result of that database transaction with these fields already updated.

Connecting to Database

In this section, the speaker discusses connecting to a database.

• The speaker puts a breakpoint here inside application.properties just for us to visualize some definitions and now here in post para essa conexão da base de dados políticos. They utilize DataSource where he already brings index that belongs to our washing machine some attributes we have to fill so that this connection can be made.

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Implementing RESTful APIs with Spring Boot

In this section, the speaker discusses implementing RESTful APIs using Spring Boot and Leonard Richardson's maturity model.

Implementing Deletion of a Resource

• To delete a resource, we need to follow the four levels of Leonard Richardson's maturity model.

• If we try to delete a resource that no longer exists in the database, we will get a 404 not found response.

• Similarly, if we try to update or view details of a non-existent resource, we will also get a 404 response.

Implementing Java Class Mapping for Database Entities

• We need to use annotations such as @Entity and @Table to map Java classes to database entities.

• The @Table annotation specifies the name of the table in the database.

• We can also define a serial version number for each class.

Implementing Hypermedia for Navigability Between Resources

• To implement hypermedia and navigability between resources, we need to use Spring HATEOAS.

• This is done by creating an interface that shows the JVM that it is enabled for serialization.

• We also need to document our API using Bean API documentation.

Using Jakarta Persistence Annotations

• We can use Jakarta Persistence annotations such as @Entity and @Table instead of Java Persistence annotations.

• These annotations are used for mapping Java classes to database entities.

Changes in Naming Conventions with Spring Boot 3

• With Spring Boot 3, there have been changes in naming conventions for persistence annotations.

• For example, before Table was written before XML point but now it is written after Table.

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Creating a Product Repository Interface

In this section, the speaker creates a separate interface called "Product Repository" and extends the JPA repository. They also discuss building the answer for the list of products and enabling all necessary methods.

• Create a separate interface called "Product Repository"

• Extend the JPA repository

• Build the answer for the list of products

• Enable all necessary methods

Building URLs for Resources

In this section, the speaker discusses how to build URLs for resources using links and attributes. They also mention using annotations to define classes as Beans.

• Build URLs for resources using links and attributes

• Use annotations to define classes as Beans

Implementing Dependency Injection

In this section, the speaker implements dependency injection by creating an interface that can be managed by Spring Framework. They also discuss how to use annotations to show that a class can be managed by Spring.

• Implement dependency injection by creating an interface that can be managed by Spring Framework

• Use annotations to show that a class can be managed by Spring

Building Links in Get One Product Method

In this section, the speaker makes changes to the Get One Product method so that it builds links before sending responses to clients. They also discuss referencing other methods instead of gateways when redirecting from specific products.

• Make changes to Get One Product method so that it builds links before sending responses to clients

• Reference other methods instead of gateways when redirecting from specific products

Conclusion and Call to Action

In this section, the speaker concludes the video and encourages viewers to leave a thumbs up, subscribe to the channel, and utilize the repository created in the tutorial.

• Again, @.

• Don't forget to leave the thumbs up here so that this video ela é derivada da anotação @ controle, can be shown to other people who are also então podemos utilizar o rest controller para ficar mais sugestivo.

• Wanting to learn more about Spring about Java about APIs ainda que essa é um bom Spring que tem a implementação de uma API REST, certo.

• And also don't forget to subscribe here to the channel E agora para já, deixar também pronto para utilizarmos do nosso repositório que acabamos de criar. See you in the next videos here on the channel.

Creating a Product Repository

In this section, the speaker creates a point of injection for a product repository.

• I'm posting over here, right já vamos criar aqui também um ponto de injeção de produto Repository.

• Temos aqui algumas formas de iniciar este ponto de injeção.