一、通过注解扫描方式实现

1. 通过注解方式创建一个Servlet

在com.suke.springboot.servlet包下创建MyServlet

/*
 * http://localhost:9014/014-springboot-filter/MyServlet
 * */
@WebServlet(value = "/MyServlet")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("-------doGet------");
        resp.getWriter().write("you had me at hello");
    }
 
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("-------doPost------");
    }
}

2. ​​​​​​​在主应用程序Application类上添加注解

注解：@ServletComponentScan("com.suke.springboot.servlet")

@SpringBootApplication
@ServletComponentScan("com.suke.springboot.web")
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
 
}

3. ​​​​​​​​​​​​​​启动应用SpringBoot，浏览器访问测试

二、通过Spring Boot的配置类实现（组件注册）

1. ​​​​​​​创建一个普通的Servlet

ublic class HeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.getWriter().print("He SpringBoot Servlet");
        response.getWriter().flush();
        response.getWriter().close();
    }
 
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request,response);
    }
}

2.​​​​​​​ 编写一个Spring Boot的配置类，在该类中注册Servlet

@Configuration //添加@Configuration 将此类变为配置变
public class ServletConfig {
 
    /**
     * @Bean是一个方法级别上的注解，主要用在@Configuration注解的类里，也可以用在@Component注解的类里。添加的bean的id为方法名
     * 如下代码相当于
     * <beans>
     *     <bean id="transferService" class="com.acme.TransferServiceImpl"/>
     * </beans>
     * @return
     */
    @Bean
    public ServletRegistrationBean heServletRegistrationBean() {
 
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new HeServlet(),"/servlet/heServlet");
 
        return servletRegistrationBean;
    }
}

3. ​​​​​​​启动应用SpringBoot，浏览器访问测试