在Springboot的啟動類上必須新增@ServletComponentScan這個標籤，否則不會有效果
@ServletComponentScan作用就是掃描相應的Servlet包;

1、建立一個myFilter類。實現Filter中的方法。

/**
 * Created by hua on 2016/12/2.
 */
@WebFilter(filterName="myFilter",urlPatterns="/*")
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws
 
 ServletException {
        System.out.println("過濾器初始化");
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("執行過濾操作");
        chain.doFilter(request, response);
    }
    @Override
 

    public void destroy() {
        System.out.println("過濾器銷燬");
    }
}

建立Listener

@WebListener
public class MyHttpSessionListener implements HttpSessionListener {
    @Override
    public void sessionCreated(HttpSessionEvent httpSessionEvent) {
        System.out.println("Session 被建立");
    }
    @Override
 

    public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
        System.out.println("ServletContex初始化");
    }
}

@WebListener
public class MyServletContextListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        System.out.println("ServletContex初始化");
    }
    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        System.out.println("ServletContex銷燬");
    }
}