Spring Boot 2.0.1 Getting Started tutorial

Brief introduction

Spring boot is a set of basic configuration environments provided by spring that can be used to quickly develop products at the production environment level. Especially suitable for the development of micro-service architecture, save a lot of configuration trouble. For example, when you use spring MVC, you simply spring-boot-starter-web add dependencies to maven dependencies. In addition, it has the following features:

• Create a separate spring project
• Built-in Tomcat, Jetty,undertow
• Initial POM configuration file to simplify MAVEN configuration
• Automatically configure spring as much as possible
• Provides production environment functions such as statistics, health checks and external configuration
• No need for XML configuration and code generation

Create a Spring Boot app

• Development environment: IntelliJ, JDK 1.8
• Project Source Code Gitee

First create a MAVEN project in IntelliJ:

• GroupID:cn.zxuqian
• Artifactid:helloworld

After creation, the IntelliJ will prompt you to import the Maven configuration automatically, and select Enable Auto-import to start the automatic import. Then add the following code to the Pom.xml:

<?xmlVersion= "1.0" encoding= "UTF-8"?><projectxmlns="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>The tag adds spring-boot-starter-web dependencies, namely Spring MVC and the associated runtime environment. The spring-boot-maven-plugin plugin provides a set of Maven run targets that can be easily packaged, deployed, and run. Wait a moment. maven automatically downloads dependencies and then can write on the handwritten code.

Create the first controller

src/mainunder Create a new package cn.zxuqian.controllers and create a new class in it, name HelloController and add the following code:

package cn.zxuqian.controllers;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublicclass HelloController {    @RequestMapping("/")    publicindex() {        return"Hello World!";    }    }

• @RestControllerMark this class as a rest controller and be ready to handle rest requests.
• @RequestMapping("/")That is, this method handles a root-path request, such as http://localhost:8080/ .
• indexThe method returns the string data, which is "Hello world".

Creating the Application Class

cn.zxuqiancreate the class under the package Application and add the following code:

package cn.zxuqian;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublicclass Application {    publicstaticvoidmain(String[] args) {        SpringApplication.run(Application.class, args);    }}

• @SpringBootApplicationIndicates the startup class for this type of Spring boot app.

Run the App

Select the Right tab in IntelliJ Maven Projects , and then expand plugins-->spring-bootto select the spring-boot:run target. After the successful launch, the access seen in the browser http://localhost:8080 Hello World! is successful.

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

Spring Boot 2.0.1 Getting Started tutorial