java 在Jetty9中使用HttpSessionListener和Filter实例详解

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java 在Jetty9中使用HttpSessionListener和Filter

HttpSessionListener

当Session创建或销毁的时候被调用

示例代码:

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

注册方法:

ServletContextHandler.getSessionHandler().addEventListener(new MyHttpSessionListener());

注意:  若整个请求中都没有用到Session, 则不会生成它, 也不会调用Listener

Filter

当客户端请求数据时被调用

示例代码:

class MyFilter implements Filter { 
 
  public MyFilter() { 
 
  } 
 
  @Override 
  public void init(FilterConfig filterConfig) throws ServletException { 
 
  } 
 
  @Override 
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { 
    if (servletRequest instanceof HttpServletRequest) { 
      HttpServletRequest httpRequest = (HttpServletRequest) servletRequest; 
 
      System.out.println(httpRequest.getServletPath()); 
    } 
    filterChain.doFilter(servletRequest, servletResponse); 
  } 
 
  @Override 
  public void destroy() { 
 
  } 
}

注册方法:

ServletContextHandler.addFilter(new FilterHolder(new MyFilter()), "/*", EnumSet.allOf(DispatcherType.class));

注意: 若请求的路径错误, 则不会触发Filter

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