SpringBoot整合Servlet的两种方式

• 工程pom文件加入Jar包

  
          org.springframework.boot
          spring-boot-starter-web
      

  1. 注解扫描方式

  - 准备Servlet
   

  @WebServlet(name = "firstServlet", urlPatterns = "/firstServlet")  //标记为servlet，以便启动器扫描。
  public class FirstServlet extends HttpServlet {
  
      @Override
      protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
          resp.getWriter().append("firstServlet");
      }
  
  }
  

  - 注册Servlet
   

  @SpringBootApplication
  @ServletComponentScan   //启动器启动时，扫描本目录以及子目录带有的webservlet注解的
  public class FirstServletApplication {
  
      public static void main(String[] args) {
          SpringApplication.run(FirstServletApplication.class, args);
      }
  }
  

  2. 组建注册方式

  - 准备Servlet
   

  //这里不需要添加webServlet注解
  public class SecondServlet extends HttpServlet {
      @Override
      protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
          resp.getWriter().append("SecondServlet");}}
  

  - 注册Servlet
   

  @SpringBootApplication
  public class SecondServletApplication {
      public static void main(String[] args) {
          SpringApplication.run(SecondServletApplication.class, args);
      }
      @Bean  //一定要加，不然这个方法不会运行
      public ServletRegistrationBean getServletRegistrationBean() {  //一定要返回ServletRegistrationBean
          ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());     //放入自己的Servlet对象实例
          bean.addUrlMappings("/secondServlet");  //访问路径值
          return bean;}}