read11.md

Spring

• How to complete this guide?

• create a repo, after that clone int in your machine.
• Create a Web Controller.

pom.xml file that is created when you choose Maven:

`

<modelVersion>4.0.0</modelVersion>

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>2.4.3</version>
	<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>serving-web-content</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>serving-web-content</name>
<description>Demo project for Spring Boot</description>
<properties>
	<java.version>1.8</java.version>
</properties>
<dependencies>
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-thymeleaf</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-web</artifactId>
	</dependency>

	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-devtools</artifactId>
		<scope>runtime</scope>
		<optional>true</optional>
	</dependency>
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-test</artifactId>
		<scope>test</scope>
	</dependency>
</dependencies>

<build>
	<plugins>
		<plugin>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-maven-plugin</artifactId>
		</plugin>
	</plugins>
</build>

`

build.gradle file that is created when you choose Gradle:

< plugins {

id 'org.springframework.boot' version '2.4.3'

id 'io.spring.dependency-management' version '1.0.11.RELEASE'

id 'java'

}

group = 'com.example'

version = '0.0.1-SNAPSHOT'

sourceCompatibility = '1.8'

repositories {

mavenCentral()

}

dependencies {

implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'

implementation 'org.springframework.boot:spring-boot-starter-web'

developmentOnly 'org.springframework.boot:spring-boot-devtools'

testImplementation 'org.springframework.boot:spring-boot-starter-test'

}

test {

useJUnitPlatform()

}

Manual Initialization

1- Navigate to https://start.spring.io. This service pulls in all the dependencies you need for an application and does most of the setup for you.

2- Choose either Gradle or Maven and the language you want to use. This guide assumes that you chose Java.

3- Click Dependencies and select Spring Web, Thymeleaf, and Spring Boot DevTools.

4- Click Generate.

5- Download the resulting ZIP file, which is an archive of a web application that is configured with your choices.

Create a Web Controller

HTTP requests are handled by a controller. You can easily identify the controller by the @Controller annotation. In the following example, GreetingController handles GET requests for /greeting by returning the name of a View (in this case, greeting). A View is responsible for rendering the HTML content.

` package com.example.servingwebcontent;

import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam;

@Controller public class GreetingController {

@GetMapping("/greeting")
public String greeting(@RequestParam(name="name", required=false, defaultValue="World") String name, Model model) {
	model.addAttribute("name", name);
	return "greeting";
}

} `

Spring Boot Devtools

Spring Boot Devtools:

1- Enables hot swapping.

2- Switches template engines to disable caching.

3- Enables LiveReload to automatically refresh the browser.

4- Other reasonable defaults based on development instead of production.

• If you use Gradle, you can run the application by using ./gradlew bootRun.

• you can build the JAR file by using ./gradlew build and then run the JAR file, as follows: java -jar build/libs/gs-serving-web-content-0.1.0.jar.