注册Servlet

/**
 * 自定义Servlet组件
 */
public class HelloServlet extends HttpServlet {
    //快捷键 ctrl+o
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            this.doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("helloServlet seccess...");
    }
}

//注册Serlet组件
@Configuration
public class MyServletConfig {
    @Bean
    public ServletRegistrationBean helloServlet(){
　　　　　　// 注册自己自定义组件
        ServletRegistrationBean<HelloServlet> bean = new ServletRegistrationBean<>(new HelloServlet(), "/hello");
        //设置servlet组件参数配置,如下面加载顺序
        bean.setLoadOnStartup(1);
        return bean;
    }
}

注册Servlet三大组件Servlet/Filter/Listener