Spring Boot - spring-boot-starter

spring-boot-starter

When learning Spring Boot, you can understand and practice its basic concepts and functions through a complete case. Here is a simple Spring Boot
Starter complete example showing how to create a basic web application:

First, create a Maven project file named pom.xml, add the following content: idea or other direct creation skip!

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.4</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.lfsun</groupId>
<artifactId>springboot-study-2023</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-study-2023</name>
<description>springboot-study-2023</description>
<packaging>pom</packaging>
<properties>
<java.version>1.8</java.version>
<spring-boot.version>2.7.4</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>

</project>

子模块：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.lfsun</groupId>
        <artifactId>springboot-study-2023</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>spring-boot-starter</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-starter</name>
    <description>spring-boot-starter</description>
    <dependencies>
        <!-- Spring Boot Starter Web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

In the above example, we defined a Maven project and added the Spring Boot Starter Web dependency, which will provide us with the dependencies needed to build a web-based application.

Next, create a Java class called SpringBootStarterApplication.java with the following content:

package com.lfsun.springbootstarter;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootStarterApplication {
    
    

	public static void main(String[] args) {
    
    
		SpringApplication.run(SpringBootStarterApplication.class, args);
	}

}


@RestController
class HelloController {
    
    

    @GetMapping("/hello")
    public String hello() {
    
    
        return "Hello, World!";
    }

}

In this example, we create an
entry class SpringBootStarterApplication for a Spring Boot application
, marked with the @SpringBootApplication annotation. We also created a HelloController class and used @RestController and @GetMapping annotations to handle HTTP
GET requests and return "Hello, World!".

Now, you can build and run the application using a build tool such as Maven. Execute the following command:
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mvn clean package

java -jar .\target\spring-boot-starter-0.0.1-SNAPSHOT.jar

The application will start, listening on the default port 8080. You can visit http://localhost:8080/hello in your browser and you will see the "Hello, World!" message returned.