Spring Boot Web应用开发 Servlets、Filters、listeners

Web开发使用 Controller 基本上可以完成大部分需求，但是我们还可能会用到 Servlet、 Filter、Listener等等 二.在spring boot中的三种实现方式  方法一：通过注册ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制 /** * 自定义servlet * * @author wujing */public class CustomServlet extends HttpServlet {   /**   *   */  private static final long serialVersionUID = 1L;   @Override  protected void doGet(HttpServletRequest request, HttpServletResponse response)         throws ServletException, IOException {    System.out.println("servlet get method");    doPost(request, response);  }   @Override  protected void doPost(HttpServletRequest request, HttpServletResponse response)         throws ServletException, IOException {    System.out.println("servlet post method");    response.getWriter().write("hello world");  } } /** * 自定义filter * * @author wujing */public class CustomFilter implements Filter {   @Override  public void init(FilterConfig filterConfig) throws ServletException {    System.out.println("init filter");  }   @Override  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)         throws IOException, ServletException {    System.out.println("do filter");    chain.doFilter(request, response);  }   @Override  public void destroy() {    System.out.println("destroy filter");  } } /** * 自定义listener * * @author wujing */public class CustomListener implements ServletContextListener {   @Override  public void contextInitialized(ServletContextEvent sce) {    System.out.println("contextInitialized");  }   @Override  public void contextDestroyed(ServletContextEvent sce) {    System.out.println("contextDestroyed");  } } 注册bean @Bean  public ServletRegistrationBean servletRegistrationBean() {    return new ServletRegistrationBean(new CustomServlet(), "/roncoo");  }   @Bean  public FilterRegistrationBean filterRegistrationBean() {    return new FilterRegistrationBean(new CustomFilter(), servletRegistrationBean());  }   @Bean  public ServletListenerRegistrationBean<CustomListener> servletListenerRegistrationBean() {    return new ServletListenerRegistrationBean<CustomListener>(new CustomListener());  }   方法二：通过实现 ServletContextInitializer 接口直接注册 implements ServletContextInitializer {    @Override   public void onStartup(ServletContext servletContext) throws ServletException {      servletContext.addServlet("customServlet", newCustomServlet()).addMapping("/roncoo");      servletContext.addFilter("customFilter", new CustomFilter())            .addMappingForServletNames(EnumSet.of(DispatcherType.REQUEST), true,"customServlet");      servletContext.addListener(new CustomListener());  }   方法三：在 SpringBootApplication 上使用@ServletComponentScan 注解后，直接通过@WebServlet、@WebFilter、@WebListener 注解自动注册
转自：http://www.roncoo.com/article/detail/125499