Reading-notes

Spring :

• The Spring Framework is one of the most popular application development frameworks for creating enterprise Java applications.

• The incorporated best practices and infrastructure support provided by the framework simplifies application buildup and breakdown, allowing developers to spend more time on business logic.

Serving Web Content with Spring MVC

-You will build an application that has a static home page and that will also accept HTTP GET requests ,It will respond with a web page that displays HTML. The body of the HTML will contain ur HTML code .

Complete the guide :

• You should Download and unzip the source repository for this guide, or clone it , and you will cd into some thing serving web content , and after that creat a web Controller .

Starting with Spring Initializr:

-After that you can Starting with Spring Initializr by use pre-pre-initialized project and click Generate to download a ZIP file or manually by navigating to some thing to pull all the dependencies you need for an application.

• And you will copmlete your steps and you will an archive of a web application that is configured with your choices.

About Create a web controller:

• In Spring’s approach to building web sites, HTTP requests are handled by a controller. You can easily identify the controller by the @Controller annotation.

• After you done Make sure you have Thymeleaf on your classpath (artifact co-ordinates: org.springframework.boot:spring-boot-starter-thymeleaf). It is already there in the “initial” and “complete” samples in Github.

You have just developed a web page by using Spring , but for sure go and search to know the exact informations and the commands.

Spring Boot Devtools:

• Spring Boot gives us the ability to quickly setup and run services.A common feature of developing web applications is coding a change, restarting your application, and refreshing the browser to view the change.

Run the Application :

• The Spring Initializr creates an application class for you. In this case, you need not further modify the class provided by the Spring Initializr.

Build an executable JAR:

• You can run the application from the command line with Gradle or Maven. You can also build a single executable JAR file that contains all the necessary dependencies, classes, and resources and run that.
• If you use Gradle, you can run the application by using ./gradlew bootRun.
• If you use Maven, you can run the application by using ./mvnw spring-boot:run.

Test the Application:

• you can visit ur localhost and test maybe the greeting of your App .
• Provide a name query string parameter by visiting http://localhost:8080/greeting?name=User.

And After All Of That you can Add a Home page of your App by including HTML,CSS and Js , They can be served from your Spring Boot application by dropping them into the right place in the source code.

Spring MVC and Thymeleaf:

• how to access data from templates?

What is Thymeleaf:

• Thymeleaf is a Java template engine for processing and creating HTML, XML, JavaScript, CSS, and text.

• Integrating Thymeleaf With Spring.

• @Controller classes are responsible for preparing a model map with data and selecting a view to be rendered. => it is transformed into a Thymeleaf context object (part of the Thymeleaf template execution context) that makes all the defined variables available to expressions executed in templates.

1.Spring model attributes:

• Spring MVC calls the pieces of data that can be accessed during the execution of views model attributes. The equivalent term in Thymeleaf language is context variables.
• In Thymeleaf, these model attributes (or context variables in Thymeleaf jargon) can be accessed with the following syntax: ${attributeName}, where attributeName in our case is messages.

2.Request parameters:

• Request parameters can be easily accessed in Thymeleaf views. Request parameters are passed from the client to server.

3.Session attributes:

• like mySessionAttribute ,Similarly to the request parameters, session attributes can be accessed by using the session .Or by using #session, that gives you direct access to the javax.servlet.http.HttpSession object: ${#session.getAttribute(‘mySessionAttribute’)} .

4.ServletContext attributes:

• The ServletContext attributes are shared between requests and sessions. In order to access ServletContext attributes in Thymeleaf you can use the #servletContext.

5.Spring beans:

Thymeleaf allows accessing beans registered at the Spring Application Context with the @beanName syntax.

AND That All