Idea implements the first Springboot program

1. Environment preparation

• The JDK: 1.8
• Apache Maven: 3.6.1
• IntelliJ IDEA 2019.1.3 x64
• SpringBoot 1.5.9.RELEASE: 1.5.9;

1.1. MAVEN Settings: Add the Profiles tag to MAVEN’s settings. XML configuration file

<profile>
  <id>JDK - 1.8 -</id>
  <activation>
    <activeByDefault>true</activeByDefault>
    <jdk>1.8</jdk>
  </activation>
  <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
  </properties>
</profile>
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2. Implement SpringBoot Helloworld case

The browser sends a Hello request, the server accepts and processes the request, and responds with a Hello World string.

2.1. Create a Maven project; (jar)

2.2 import Spring Boot-related dependencies

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9. RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
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3. Write a main program; Start the Spring Boot application

package com.xdr;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/* @springBootApplication to annotate a main program */
@SpringBootApplication
public class HelloWorldApplication {
    public static void main(String[] args) {
        System.out.println("Start the Springboot program"); SpringApplication.run(HelloWorldApplication.class, args); }}Copy the code

4. Write related Controller and Service

package com.xdr.com.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Controller {
    @RequestMapping("hello")
    public String sayHello(a){
        return "Hello SpringBoot"; }}Copy the code

5. Run the main program test

server.port=8082
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Simplify deployment

 <! -- This plugin can package the application into an executable JAR package; -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
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Jar the application into a jar package, directly using the java-jar xxx.jar command (XXX indicates the name of the jar package) to execute;

Maven package comes with IDEA







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