整合Servlet，Filter和Listener

Servlet

@WebServlet(urlPatterns = "/myservlet")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("MyServlet");
    }
}

Filter

@WebFilter(urlPatterns = "/*")
public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("MyFilter");
        filterChain.doFilter(servletRequest,servletResponse);
    }
}

Listener

@WebListener
public class MyRequestListener implements ServletRequestListener {
    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        System.out.println("requestDestroyed");
    }

    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        System.out.println("requestInitialized");
    }
}

加注解

访问http://localhost:8080/myservlet