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How to use SpringBoot to write the first program Helloworld, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

1. System requirements

Java 8

Maven 3.3 +

Idea 2019 +

2.HelloWorld

Requirements: browse to send / hello request, respond to Hello,Spring Boot 2

2.1Create a maven project

2.2 introduce dependency org.springframework.boot spring-boot-starter-parent 2.3.4.RELEASE org.springframework.boot spring-boot-starter-web 2.3 to create main program / * main program class * @ SpringBootApplication: this is a SpringBoot application * / @ SpringBootApplicationpublic class MainApplication {public static void main (String [] args) {SpringApplication.run (MainApplication.class,args) Write Business @ RestControllerpublic class HelloController {@ RequestMapping ("/ hello") public String handle01 () {return "Hello, Spring Boot 2!";}}

2.5 Test

Just run the main method directly

The browser displays:

2.6 simplify configuration

Available application.properties

Server.port=8888

2.7 simplify deployment of org.springframework.boot spring-boot-maven-plugin

Package the project into a jar package and execute it directly on the target server.

Enter the folder such as target:

The cmd window executes the selected jar:

The browser displays:

Note: cancel the quick editing mode of cmd

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