java 在Jetty9中使用HttpSessionListener和Filter

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:

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:

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:

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:

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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