<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <!--自動檢測項(xiàng)目中的 main 函數(shù)-->
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

java -jar xxx.jar

<packaging>war</packaging>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <!--tomcat啟動器依賴范圍-->
    <scope>provided</scope>
</dependency>

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-war-plugin</artifactId>
   <configuration>
         <warName>hello</warName>
   </configuration>
</plugin>

package com.by;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

/**
 * @SpringBootApplication：
 *   1、標(biāo)識當(dāng)前類是springboot的啟動類
 *   2、并把啟動類所在包當(dāng)作要掃描的包
 */
@SpringBootApplication
public class App extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(App.class);
    }

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