方法一

1. 创建一个Servlet类并加上@WebServlet

@WebServlet("/student")
public class StudentServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().println("hello student servlet!");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }
}

2. 在springBoot启动类上添加@ServletComponentScan("servlet包路径")

@SpringBootApplication
@ServletComponentScan("com.hzc.servlet")
public class SpringBoot07Application {

    public static void main(String[] args) {
        SpringApplication.run(SpringBoot07Application.class, args);
    }

}

方式二

1. 创建一个Servlet类，不添加注解

public class UserServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("hello user servlet!");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }
}

2. 创建Servlet核心配置类，注册servlet.注意@Bean和返回一个ServletRegistrationBean

@Configuration
public class ServletConfig {
    @Bean
   public ServletRegistrationBean servletRegistrationBean(){
       ServletRegistrationBean<UserServlet> userServlet = new ServletRegistrationBean<>(new UserServlet(), "/user");
       return userServlet;
   }
}

SpringBoot使用Servlet