(i) Springboot Basics-Introduction and HelloWorld Experience

1.SpringBoot Introduction:

Based on the official Springboot document description, buildanything with spring boot (build anything with spring boot, Bull x!). ), here is the official documentation (document address, interested can see: https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/# Boot-documentation):

　　

• • Start the project within the second range;
  • Build anything--rest API, WebSocket, Web, streaming media, tasks, etc.;
  • Simplified security architecture;
  • Rich relational database and non-relational database support;
  • Embedded operating environment support, Tomcat,jetty and undertow;
  • Developer benefits, hot deployment, etc.;
  • Just a reliance on the work;
  • Can be productive, tracking, monitoring and other characteristics;
  • Support your common IDE tools;

2.SpringBoot Operating Environment:

JDK Environment: 1.8+;

Project Building tools: maven:3.2+;

Gradle: Compatible with 4;

servlet container:

Name	Servlet Version
Tomcat 8.5	3.1
Jetty 9.4	3.1
Undertow 1.4	3.1

3.SpringBoot Initial Experience (HelloWorld):

1. Introduce the MAVEN dependency library:

1<?xml version= "1.0" encoding= "UTF-8"?>2<project xmlns= "http://maven.apache.org/POM/4.0.0"3Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"4xsi:schemalocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" >5<modelVersion>4.0.0</modelVersion>6 7<groupId>com.cn</groupId>8<artifactId>spring-boot-hello</artifactId>9<version>1.0-SNAPSHOT</version>Ten  One<properties> A<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> -<java.version>1.8</java.version> -</properties> the  -<parent> -<groupId>org.springframework.boot</groupId> -<artifactId>spring-boot-dependencies</artifactId> +<version>2.0.1.RELEASE</version> -</parent> +  A<dependencies> at<dependency> -<groupId>org.springframework.boot</groupId> -<artifactId>spring-boot-starter-web</artifactId> -</dependency> -</dependencies> -</project>

Pom.xml

2. Create a Startup class:

1  Packagecom.cn;2 3 Importorg.springframework.boot.SpringApplication;4 Importorg.springframework.boot.autoconfigure.SpringBootApplication;5 6 /**7 * @program: Spring-boot-example8 * @description: Start class9  * @author:Ten * @create: 2018-04-28 10:42 One  **/ A @SpringBootApplication -  Public classhelloapplication { -  the     /** - * @Description: - * @Param: [Class] Configuration class source class - * @Param: [args] Apply startup parameters +      * @return: void - * @Author: + * @Date: 2018/4/28 A      */ at      Public Static voidMain (string[] args) { -Springapplication.run (helloapplication.class, args); -     } -  -}

Helloapplication.java

3. Create a controller access to interface:

1  PackageCom.cn.controller;2 3 Importorg.springframework.web.bind.annotation.RequestMapping;4 ImportOrg.springframework.web.bind.annotation.RestController;5 6 /**7 * @program: Spring-boot-example8 * @description: Control layer: Helllocontroller9  * @author:Ten * @create: 2018-04-28 10:49 One  **/ A  - @RestController -  Public classHellocontroller { the  -     /** - * @Description: - * @Param: +      * @return: - * @Author: + * @Adress:http://localhost: 8080/hello A * @Date: 2018/4/28 at      */ -@RequestMapping ("Hello") -      PublicString Hello () { -         return"Hello world!"; -     } -  in}

Hellocontroller.java

4. Start the startup class, open the browser, enter Http://localhost:8080/hello access:

　　

Returns HelloWorld to the page;

　　Note:

• • @SpringBootApplication: Springboot Start-up class annotations, see the source found it is actually @springbootconfiguration, @EnableAutoConfiguration, @ Componentscan three sets of annotations (after the source code will have an advanced article, I think learning a thing first to learn its application and then learn its essence);

  • Springapplication.run (Helloapplication.class, args); The real boot code, will do some initialization operation, start the built-in listener, create key environment object and load configuration items, etc.
    

  • @RestController: Or to view source code discovery, it is a collection of @controller, @ResponseBody, it Spring4 after the newly added annotations, the original return JSON needs @responsebody and @controller mates , now one step is done;

  • @RequestMapping ("Hello") request mapping not much to say;

Complete Example: https://gitee.com/lfalex/spring-boot-example

Reference Official Document: https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-documentation

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(i) Springboot Basics-Introduction and HelloWorld Experience