In two ways, you can build a spring boot application in five minutes

Snail Internet 2021-01-21 09:38:07
ways build spring boot application


Preface

Spring Boot Of course, there is no need to say more about the benefits of , For wanting to engage in Java Friends at work , It's a must learn skill .

in my opinion , Its advantage is Achieve greater, faster, better and more economical results .

  • Multi function , Many common capabilities have integration ;
  • Fast access , A few simple lines of code can complete the access ;
  • Maintain , High community activity , When you have a question, you can find the answer at the first time ;
  • To save money , Free open source projects are naturally the favorite of individuals or enterprises .

Let's talk about it in detail Spring Boot Access tutorial for , It is convenient for readers who have just come into contact with this technology to learn .

Related dependencies

Technology stack :

  • Java 8
  • Maven 3
  • Spring Boot 2.4.2

Environmental Science :

  • operating system :MacOS(Windows Also similar )
  • IDE( Integrated development environment ):IntelliJ IDEA Flagship Edition 2020.1 edition

Spring Boot Project initialization

There are two ways :

  1. Official Website Package
  2. IDE Generate

Official Website Package

Visit the official website :https://start.spring.io/.

Specify how the project is built Maven, Choice language Java.

Spring Boot Choose the latest stable version 2.4.2, Project metadata fills in organization and project related information .

The right side depends on choosing the package you will use , Here I have chosen Lombok and Spring Web, The former helps us write less code , The latter supports web Page access , It's convenient for me to do a demonstration .

And then click on the bottom GENERATE Button , The website will automatically generate zip Package and download to local .

After decompressing , We can see the following directory structure .HELP It's a help document ,mvnw It's a program startup command file ,pom Placed project dependencies ,src Contains the source code of the project .

IDE Generate

Access plug in :

  • Get into IntelliJ IDEA Of preferences , stay Plugins Search inside Spring Boot, Check the box , Make plug-ins work .
  • Press the prompt to restart IDE, You can use .

spring_boot_plugin

Get into IntelliJ IDEA, Click to create a new project .

ide_rukou

choice Spring Initializr, Specify the Java SDK, Choose the default startup mode , This method needs networking , Click next .

choose_maven

By default, you need to fill in the following information , Pictured :

start_input

I changed my name , It's called course, This is a project of the tutorial website . At the same time, I put the default Java The version is down to 8, Because I use this version more often .

start_input_java4u

Click next , What we're seeing is adding dependent pages , Support keyword search , You can choose the dependent package you need . The actual effect is consistent with the official website page , Here I still choose Lombok and Spring Web.

spring_dep

Click next , Set the project name and path , The default name is before Maven In the setup artifact Value , I don't usually change .

new_project_name

Click finish ,IDE Just help us build Spring Boot Project , The file structure is consistent with the package downloaded from our official website .

project_page_home

The project will generate an application startup entry for us , Choose main Method run , This Spring Boot The program will run .

Here is the startup logging , The Red Square in the upper right corner represents running . Click on the Red Square , The console will prompt the program to exit , The upper right corner box will also be grayed out .

running_spring_boot

Besides using IDE start-up Spring Boot Outside , You can also use project generated command line tools . Navigate to the home directory of the project , Execute the following command (MacOS/Linux):

./mvnw spring-boot:run

Windows The user executes the following command :

mvnw spring-boot:run

You'll see this Spring Boot The whole process of a project from construction to compilation to deployment .

cmd_run_1

cmd_run_2

If you want to terminate the application ,Ctrl + C that will do .

cmd_stop

The demonstration just now did not involve Web Page , If you want to see the page's access effect , How do you do that ?

add to Web Code

Web Related dependencies we have introduced when we are building projects , So just add the relevant code .

First, navigate to the file CourseApplication.java, Then add annotations to the startup class @RestController, Add a... At the same time web Access method .

@SpringBootApplication
@RestController
public class CourseApplication {

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

@GetMapping("/hello")
public String hello(@RequestParam(value = "name", defaultValue = "World") String name) {
return String.format("Hello %s!", name);
}

}

Start at this time Spring Boot, Then open the browser to access http://localhost:8080/hello, You can see the default output . Why is the port 8080 Well ? You go back and look at the screenshot of the startup log , You'll find that the project uses Tomcat Of Web The server ,HTTP The initialization port for is 8080.

default_web_output

Of course, you can also access this with parameters Get request , For example, the following kind of visit .

spec_web_output

We can also specify the port by ourselves , Put it in the app configuration file application.properties Then you can .

default 8080 It is amended as follows 9090


server.port=9090

After restarting the program , Log printing has changed , Browser access also needs to use the newly configured port to access successfully .

Okay , Fast build Spring Boot That's all for the introduction of the application , If it works for you, too , You can give me a compliment , Order one to see , You can also share it with your friends , Thank you very much .

I'm a snail , Crawling on the Internet , See you next time .


版权声明
本文为[Snail Internet]所创,转载请带上原文链接,感谢
https://javamana.com/2021/01/20210121093016114r.html

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