package apibook.c7.s1;import javax.servlet.*;import javax.servlet.http.*;//測試ServletContextListener接口public class MyConnectionManager implements ServletContextListener {  public MyConnectionManager() {  }  public static void main(String[] args) {    MyConnectionManager myConnectionManager1 = new MyConnectionManager();  }  public void contextInitialized(ServletContextEvent parm1) {    String con = "Connection";    //      parm1.getServletContext().setAttribute("con", con);  }  public void contextDestroyed(ServletContextEvent parm1) {    String con =       (String) parm1.getServletContext().getAttribute("con");   con = null;  }}