java 在Jetty9中使用HttpSessionListener和Filter

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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