java中的SpringBoot框架

 <properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
</properties>

<parent>
    <!-- spring-boot-starter-parent指定了当前项目为一个Spring Boot项目，它提供了诸多的默认Maven依赖-->
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.3.RELEASE</version>
    <relativePath/>
</parent>

<dependencies>
  <!-- web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
<!--             排除某个依赖-->
<!--            <exclusions>-->
<!--                <exclusion>-->
<!--                    <groupId>org.springframework.boot</groupId>-->
<!--                    <artifactId>spring-boot-starter-tomcat</artifactId>-->
<!--                </exclusion>-->
<!--            </exclusions>-->
        </dependency>
</dependencies>


<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>2.1.3.RELEASE</version>
        </plugin>
    </plugins>
</build>

server:
  port: 8080 # 设置应用端口，默认是8080
spring:
  application:
    name: app

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

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