官网：https://spring.io/projects/spring-boot#learn
快速开始：https://docs.spring.io/spring-boot/docs/current/reference/html/getting-started.html#getting-started.first-application
配置文件：https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#appendix.application-properties.json

系统要求

● Java 8 & 兼容java14 .
● Maven 3.3+

maven配置

<mirrors>
      <mirror>
        <id>nexus-aliyun</id>
        <mirrorOf>central</mirrorOf>
        <name>Nexus aliyun</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public</url>
      </mirror>
  </mirrors>

  <profiles>
         <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>
  </profiles>

引入依赖

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

创建主程序

/**
 * 主程序类
 * @SpringBootApplication：这是一个SpringBoot应用
 */
@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) {

        SpringApplication.run(MainApplication.class,args);
    }
}

编写业务

//@Controller
//@ResponseBody
@RestController //代替上面两个注解
public class HelloController {

    @RequestMapping("/hello")
    public String hello(){
        return "hello SpringBoot2!";
    }
}

简化配置

application.properties

server.port=8084

启动

直接运行main方法

简化部署

 <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

把项目打成jar包，直接在目标服务器执行即可。

注意点：
● 取消掉cmd的快速编辑模式