SpringBoot16 之 Listener and Filter

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在Springboot的启动类上必须添加@ServletComponentScan这个标签，否则不会有效果
@ServletComponentScan作用就是扫描相应的Servlet包;

1、创建一个myFilter类。实现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("过滤器初始化");    }    @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {        System.out.println("执行过滤操作");        chain.doFilter(request, response);    }    @Override    public void destroy() {        System.out.println("过滤器销毁");    }}

创建Listener

@WebListenerpublic class MyHttpSessionListener implements HttpSessionListener {    @Override    public void sessionCreated(HttpSessionEvent httpSessionEvent) {        System.out.println("Session 被创建");    }    @Override    public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {        System.out.println("ServletContex初始化");    }}

@WebListenerpublic 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销毁");    }}

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