1.springboot專案內建有Tomcat，首先我們要去掉這個tomcat引入如下依賴

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

2.把jar改成war

<packaging>war</packaging>
 

3.更改執行類

@SpringBootApplication
public class SpringBootStartApplication extends SpringBootServletInitializer{

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(SpringBootStartApplication.class);
    }

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

4.使用maven打包

打包成功後放著tomcat下的webapps下。執行tomcat會自動解壓這個war包，訪問路徑 ip:port/project名/...