原生注解方式注入web原生组件

• 使用原生注解注入servlet组件：@WebServlet处理请求路由，+主配置类中标注@ServletComponentScan扫描原生注解所在的路径

• @WebServlet(urlPatterns = "/my")

• public class MyServlet extends HttpServlet {

• @Override

• protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

• resp.getWriter().write("66666");

• }

• }

• 


• @MapperScan("com.atguigu.admin.mapper")

• @ServletComponentScan(basePackages = "com.atguigu.admin")

• @SpringBootApplication(exclude = RedisAutoConfiguration.class)

• public class Boot05WebAdminApplication {

• public static void main(String[] args) {

• SpringApplication.run(Boot05WebAdminApplication.class, args);

• }

• }

• ``

• 


• - 使用原生注解注入filter组件：@WebFilter + @ServletComponentScan

• 


@Slf4j
@WebFilter(urlPatterns={"/css/","/images/"}) // 表示拦截该路径下的静态资源
public class MyFilter implements Filter {

• @Override

• public void init(FilterConfig filterConfig) throws ServletException {

• log.info("MyFilter初始化完成");

• }

• 


• @Override

• public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

• log.info("MyFilter工作");   // 拦截后进行逻辑处理

• chain.doFilter(request,response);   // 最后放行，放行后可访问

• }

• 


• @Override

• public void destroy() {

• log.info("MyFilter销毁");

• }

• 


}

• 


• - 使用原生组件注入listener组件：@WebListener + @ServletComponentScan

• 


@Slf4j
@WebListener
public class MyServletContextListener implements ServletContextListener {

• @Override

• public void contextInitialized(ServletContextEvent sce) {

• log.info("MySwervletContextListener监听到项目初始化完成");

• }

• 


• @Override

• public void contextDestroyed(ServletContextEvent sce) {

• log.info("MySwervletContextListener监听到项目销毁");

• }

• 


}

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