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SpringBoot2.x how to create a HelloWorld project, 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.

Preface

For beginners, the SSM framework often dies in configuration, and sometimes you will find that even if you follow the tutorial step by step, you will make mistakes in the end. The emergence of Springboot has solved this problem greatly. There are already a lot of tutorials or books related to Springboot.

Environment introduction

Java version: java8

Develop IDE:IDEA

Springboot version: Springboot2.4.3

Applicable version: Springboot2.x series

Maven version: maven3.6.3

OK, go.

First, create a springBoot-HelloWorld project

1. Create a new project

I created a parent-son engineering structure:

From top to bottom, we analyze them one by one:

(1) the infrastructure of Spring Boot consists of three folders:

Src/main/java: program development folder, where we write the program code.

Src/main/resources: configuration fil

Src/test/java: test program

(2) DemoApplication.java under src/main/java

The main function is to enter the main program, which is equivalent to the main function.

(3) static under src/main/resources

There are some configuration resources, such as pictures and so on.

(4) application.proties under src/main/resources

It is a global configuration file, where you define the port number of some interfaces and other information.

(5) pom file

This file is extremely important, and it defines some project dependency information.

(6) the rest is not important. Let's not talk about it here.

The project has been set up. Look at the basic case.

Second, the first SpringBoot case

Step 1: we create the Controller package under the src/main/java folder and create a new HelloWorldController class

@ RestController public class HelloWorld {@ RequestMapping ("/ hello") public String hello (String name) {return "HelloWorld!" + name;}}

Step 2: run SpringbootHelloworldApplication

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

Step 3: access directly in the browser

OK, the first case is complete.

Third, analyze small examples

1. Pom.xml file

Give the core paragraph:

Org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test

In other words, we can add the dependencies we need under the dependencies structure in the pom file.

2. Application.properties file

After adding dependencies above, we can add some configuration to this file, for example, if our port 8080 is occupied, then the port on which we modify the project is 8888, or we change the root directory of the project to test.

Server.port=8888 server.servlet.context-path=/test

The configuration of this file is super many, here is just an example to see how to match, this properties file can also be modified to yml format.

3. Controller, service and other files

For our specific business logic, we only need to encode in the corresponding file to be the same as the SSM framework.

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