Springboot部署到Tomcat访问404

用Jenkins托管代码发布，自建一个springboot测试项目，最后把项目部署到Tomcat下。在IDEA启动访问正常，部署到Tomcat后报错。

需要让启动类继承 SpringBootServletInitializer 类

实例代码：

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

@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {
    //重写configure方法
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(DemoApplication.class);
    }
    //原方法不变
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}