Spring Boot 2.0.1 Getting Started Tutorial

Introduction

Spring Boot is a basic configuration environment provided by Spring, which can be used to rapidly develop production-level products. It is especially suitable for developing microservice architecture, which saves a lot of configuration trouble. For example, when using Spring MVC, you only need to spring-boot-starter-webadd the dependency to the Maven dependency. In addition it has the following features:

• Create a standalone Spring project
• Built-in Tomcat, Jetty, Undertow
• Initial POM configuration file to simplify Maven configuration
• Auto-configure Spring as much as possible
• Provides production environment features such as statistics, health checks and external configuration
• No XML configuration and code generation required

Create a Spring Boot application

• Development environment: IntelliJ, JDK 1.8
• Project source code Gitee

First create a maven project in IntelliJ:

• GroupID: cn.zxuqian
• ArtifactId: helloworld

After the creation is complete, the lower right corner of IntelliJ will prompt to automatically import the Maven configuration. Select Enable Auto-Import to start the automatic import. Then add the following code to pom.xml:

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.zxuqian</groupId>
    <artifactId>helloworld</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

    <properties>
        <java.version>1.8</java.version>
    </properties>


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

</project>

<dependencies>Tags add spring-boot-starter-webdependencies, namely Spring MVC and the associated runtime environment. spring-boot-maven-pluginThe plugin provides a set of maven run goals that can easily package, deploy and run applications. After waiting for a while, Maven automatically downloads the dependencies and you can start writing the code.

Create the first controller

src/mainCreate a new package under cn.zxuqian.controllersand create a new class in it called HelloControllerand add the following code:

package cn.zxuqian.controllers;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/")
    public String index() {
        return "Hello World!";
    }
    
}

• @RestControllerMark this class as a Rest controller and ready to handle Rest requests.
• @RequestMapping("/")i.e. this method handles root path requests, eg http://localhost:8080/.
• indexThe method returns String type, that is, the response returns string data, here is "Hello World".

Create the Application class

Create a class under the cn.zxuqianpackage Applicationand add the following code:

package cn.zxuqian;

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

@SpringBootApplication
public class Application {

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

• @SpringBootApplicationIndicates that this class is the startup class for Spring Boot applications.

run the app

Select in the right tab of IntelliJ Maven Projects, then expand Plugins-->spring-boot , select spring-boot:runTarget . After the startup is successful, access it in the browser and http://localhost:8080see it Hello World!successful.

The article comes from my blog: http://zxuqian.cn/spring-boot-get-started/ , welcome to visit.