1、检查项目的pom.xml的打包方式是否为war

<packaging>war</packaging>

2、添加tomcat依赖，将其scope设置为provided

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

3、排除内置的tomcat

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
	<exclusions>
		<exclusion>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
		</exclusion>
	</exclusions>
</dependency>

4、修改项目启动类

@SpringBootApplication
public class Application extends SpringBootServletInitializer{
	
	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
		return builder.sources(Application.class);
	}
	
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
	
}