ServletRequestListener的用法和实例

5）ServletRequestListener：
ServletRequestListener能监听到Request的生成和销毁。
例 2.2.5.1
package com;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
public class MyServletRequestListener implements
ServletRequestListener {
/*public void requestDestroyed(ServletRequestEvent sre)Notification that the servlet request is about to go out of scope. */
    public void requestDestroyed(ServletRequestEvent arg0) {
        System.out.println("马克-to-win destroyed"+arg0.getServletRequest().getRemoteAddr());
    }
/*public void requestInitialized(ServletRequestEvent sre)Notification that the servlet request is about to go into scope. */
    public void requestInitialized(ServletRequestEvent arg0) {
        System.out.println("马克-to-win request Initialized"+arg0.getServletRequest().getRemoteAddr());
    }
}

web.xml加入下面这段话：
  <listener>
    <listener-class>com.MyServletRequestListener</listener-class>
  </listener>

用下面这两个servlet测试：
package com;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ServletHello1 extends HttpServlet {
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        System.out.println("ServletHello1 before");
        request.getRequestDispatcher("/ServletHello2").forward(request,response);
        System.out.println("这里会block5秒，ServletHello1 after");
    }
}

更多请见：http://www.mark-to-win.com/index.html?content=Jsp/jspUrl.html&chapter=Jsp/jsp6_web.html#ServletRequestListener

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