解析J2EE1.4新特性(2)-Servlet 2.4的新特性

2、Servlet Request监听器

   Servlet 2.4版在事件监听器中加入了ServletRequest监听器，包括：ServletRequestListener， ServletRequestAttributeListener和其他相关类。这些类可以用来管理和控制与ServletRequest动作有关的事件。下面的程序显示了一个典型的ServletRequest监听器的结构。

import javax.setvlet.ServletContext;

    import javax.servlet.ServletRequestListener;

    import javax.servlet.ServletRequestAttributeListener;

    import javax.servlet.http.HttpServletRequest;

    import iava.io.*;

    import java.util.Locale;

    public final class RequestListener  implements   SerVletRequestListener,

    ServletRequestAttributeListener,ServletContextListener{

        ........

public void requestlnitialized(javax.servlet.ServletRequestEvent event){

        ........

        }

public void attributeAdded(javax.servlet.ServletRequestAttributeEvent event){

        ........

        }

public void attributeRemoved(javax.servlet.ServletRequestAttributeEvent event){

        ........

        }

public void attributeReplaced(javax.servlet.ServletRequestAttributeEvent event){

        ........

        }

public void attributeDestroyed(javax.servlet.ServletRequestAttributeEvent event){

       ........

       }

    }