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
@WebListener
public 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");
}
}
@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销毁");
}
}