java 在Jetty9中使用HttpSessionListener和Filter
HttpSessionListener
當Session創建或銷毀的時候被調用
示例代碼:
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class MyHttpSessionListener implements HttpSessionListener { @Override public void sessionCreated(HttpSessionEvent httpSessionEvent) { System.out.println("sessionCreated"); } @Override public void sessionDestroyed(HttpSessionEvent httpSessionEvent) { System.out.println("sessionDestroyed"); } } |
注冊方法:
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ServletContextHandler.getSessionHandler().addEventListener(new MyHttpSessionListener()); |
注意: 若整個請求中都沒有用到Session, 則不會生成它, 也不會調用Listener
Filter
當客戶端請求數據時被調用
示例代碼:
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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() { } } |
注冊方法:
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ServletContextHandler.addFilter(new FilterHolder(new MyFilter()), "/*", EnumSet.allOf(DispatcherType.class)); |
注意: 若請求的路徑錯誤, 則不會觸發Filter
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原文鏈接：http://blog.csdn.net/sidyhe/article/details/52084558
