springboot打war包后部署到tomcat后访问返回404错误

<packaging>war</packaging>

@SpringBootApplication
public class SmallProgramApplication extends SpringBootServletInitializer {

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

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

@SpringBootApplication
public class SmallProgramApplication extends SpringBootServletInitializer implements ServletContextInitializer {

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

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        servletContext.addServlet(WeiXinServlet.class.getSimpleName(),new WeiXinServlet())//
                .addMapping("/wx");
    }

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