在SpringBoot里面使用Servlet

首先在主程序中添加注解主程序添加@ServletComponentScan

// 加上这个注解之后就可以使用原生的组件了

HttpServlet

• 继承HttpServlet 重写方法

• 添加@WebServlet

  • 第一种方式使用注解

    • @WebServlet(value = "/helsk")
      public class HelloServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, 	IOException {PrintWriter writer = resp.getWriter();writer.write("hello,World");}
      }
      

  • 第二种方式注入bean

    • @Bean
      public ServletRegistrationBean servletRegistrationBean(){ServletRegistrationBean bean = new ServletRegistrationBean();// 指定servletbean.setServlet(new HelloServlet());// 指定url路径bean.setUrlMappings(Collections.singleton("/hellsss"));return bean;
      }
      

Filter

• 实现Filter 重写方法

• 添加@WebFilter

  • 第一种方式使用注解

    • @WebFilter("/api/*")
      @Slf4j
      public class Filess implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {Filter.super.init(filterConfig);}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest se = (HttpServletRequest) servletRequest;StringBuffer requestURL = se.getRequestURL();StopWatch sw = new StopWatch();sw.start();filterChain.doFilter(servletRequest,servletResponse);sw.stop();log.debug("接口：{},耗时:{}",String.valueOf(requestURL),sw.getLastTaskTimeMillis());}@Overridepublic void destroy() {Filter.super.destroy();}
      }
      

  • 第二种方式注入bean

    •     @Beanpublic FilterRegistrationBean filterRegistrationBean(){FilterRegistrationBean bean = new FilterRegistrationBean();bean.setFilter(new Filess());bean.addUrlPatterns("/api/*");return bean;}
      

Listener

• 实现ServletRequestListener 重写方法

• 添加@WebListener

  • 第一种方式使用注解

    • @WebListener
      @Slf4j
      public class ServletListener implements ServletRequestListener {@Overridepublic void requestDestroyed(ServletRequestEvent sre) {log.debug("ServletListener 消亡");}@Overridepublic void requestInitialized(ServletRequestEvent sre) {log.debug("ServletListener 初始化");}
      }
      

  • 第二种方式注入bean

    •     @Beanpublic ServletListenerRegistrationBean servletListenerRegistrationBean (){ServletListenerRegistrationBean bean = new ServletListenerRegistrationBean();bean.setListener(new ServletListener());bean.setEnabled(true);return bean;}