首先：將jar變成war

pom.xml中

<packaging>war</packaging>

<dependency>
 <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-tomcat</artifactId>
       <scope>provided</scope>//注意：執行專案的時候需要將這句話註釋掉  不然會報錯
 </dependency>
 

public class ServletInitializer extends SpringBootServletInitializer {  

    @Override  
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {  
        return application.sources(Application.class);  
    }  

}