传统的xml配置方式

<!--Spring MVC 配置-->
<servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:conf/spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>*.action</url-pattern>
</servlet-mapping>

Spring Boot配置方式

@Configuration
public class MyWebMvcConfigurer implements WebMvcConfigurer {

    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        //开启路径后缀匹配
        configurer.setUseRegisteredSuffixPatternMatch(true);
    }
}

@SpringBootApplication
public class DemoApplication {

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

    /**
     * 设置匹配*.action后缀请求
     * @param dispatcherServlet
     * @return
     */
    @Bean
    public ServletRegistrationBean servletRegistrationBean(DispatcherServlet dispatcherServlet) {
        ServletRegistrationBean<DispatcherServlet> servletServletRegistrationBean = new ServletRegistrationBean<>(dispatcherServlet);
        servletServletRegistrationBean.addUrlMappings("*.action");
        return servletServletRegistrationBean;
    }

}