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This article introduces the relevant knowledge of "what is the application method of Spring Boot". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Preface

The reason for the emergence of Spring Boot

The emergence of Spring Boot is mainly used to solve some problems of Spring in the past, put forward the idea that agreement is better than configuration, and set many methods by default, so that developers can quickly build projects and integrate third-party content. The development efficiency is greatly improved.

Basic concept

Spring Boot is not only a framework, but also a system designed to simplify the development of Spring.

Characteristics

Spring-based development provides faster getting started, and redundant code does not simplify Spring without built-in containers

Core functions rely heavily on build tools for automated configuration

Hello World

Maven creation

Create a new empty project and create a module respectively, as shown in the following figure

Create Maven Module

Create a Module, select the Maven project, and check the previously used web skeleton

Fill in the GroupID,ArtifactID

After making your choice, press and press enter.

This completes the creation of a basic maven project

Add start-up dependency

According to the requirements of Spring Boot, simple testing and adding corresponding start-up dependent projects need to inherit Spring Boot start-up rely on Spring boot starter parent in order to integrate Spring MVC for Controller development, you need to import Spring boot starter web

4.0.0 org.springframework.boot spring-boot-starter-parent 2.2.7.RELEASE cn.ideal springboot_01_start 1.0-SNAPSHOT org.springframework.boot spring-boot-starter-web

Write Spring Boot startup classes

Here you write the Spring Boot startup class

Package cn.ideal; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @ SpringBootApplication public class MySpringBootApplication {public static void main (String [] args) {SpringApplication.run (MySpringBootApplication.class);}}

Create a control layer

Package cn.ideal.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; @ Controller public class QuickStartController {@ RequestMapping ("/ test") @ ResponseBody public String test () {return "springboot access test, take off, fly ~";}}

Test Spring Boot

When the project starts, the console will output the following

. _ _ _ / / _ _ _ (_) _ (() _ _ _ | | |. _ | _ | | _ | _ | | _ _ | | / = | _ | = | _ _ / = / _ /:: SpringBoot:: (v2.2.7.RELEASE) 2020-05-10 22 INFO 11purl 34.973 INFO 30580-[main] cn.ideal.MySpringBootApplication: Starting MySpringBootApplication on LAPTOP-5T03DV1G with PID 30580 (F:developIdeaProjectsframework-codespringboot_01_demospringboot_01_starttargetclasses started by abc in F:developIdeaProjectsframework-codespringboot_01_demo) 2020- 05-10 22 cn.ideal.MySpringBootApplication 1115 34.976 INFO 30580-[main] cn.ideal.MySpringBootApplication: No active profile set Falling back to default profiles: default 2020-05-10 22 11 INFO 35.686 INFO 30580-[main] o.s.b.w.embedded.tomcat.TomcatWebServer: Tomcat initialized with port (s): 8080 (http) 2020-05-10 22 22 11 Starting service 35.693 INFO 30580-[main] o.apache.catalina.core.StandardService: Starting service [Tomcat] 2020-05-10 22 11 INFO 30580 [main] org.apache.catalina.core.StandardEngine: Starting Servlet engine: [Apache Tomcat/9.0.34] 2020-05-10 22 INFO 1115 35.765 INFO 30580-[main] o.a.c.c.C. [tomcat]. [localhost]. [/]: Initializing Spring embedded WebApplicationContext 2020-05-10 2211 INFO 35.766 INFO 30580-[main] o.s. Web.context.ContextLoader: Root WebApplicationContext: initialization completed in 747 ms 2020-05-10 22 11 INFO 35.884 INFO 30580-[main] o.s.s.concurrent.ThreadPoolTaskExecutor: Initializing ExecutorService 'applicationTaskExecutor' 2020-05-10 22 initialization completed in 11 main 35.990 INFO 30580-[main] o.s.b.w.embedded.tomcat.TomcatWebServer: Tomcat started on port (s): 8080 (http) with context path'' 2020-05-10 22 INFO 1115 35.993 INFO 30580-[main] cn.ideal.MySpringBootApplication

The picture is shown as follows

Enter the controller project you created and print it directly.

The project is packaged as a jar package

Add dependency

Org.springframework.boot spring-boot-maven-plugin

Click on the right, package to package, and select the package option

You can see that a new jar package is generated under target, which runs directly in cmd.

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