1.排除嵌入式tomcat

1.1 方式一
<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>

1.2 方式二
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope
 
>
</dependency>

1. 註釋spring-boot-maven-plugin，使用maven-war-plugin

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
</plugin> -->

<plugin>
    <groupId>org.apache.maven.plugins</groupId
 
>
    <artifactId>maven-war-plugin</artifactId>
    <configuration>
        <failOnMissingWebXml>false</failOnMissingWebXml>
    </configuration>
</plugin>

3.修改啟動類

public class Application extends SpringBootServletInitializer {

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

    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).web(true).run(args);
    }
}

4.pom.xml裡指定低版本的tomcat

<properties>
    <tomcat.version>7.0.47</tomcat.version>
</properties>

5.刪除web.xml檔案