initdestroy.txt

J2EE导学

<%--
 
  Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
  
  This software is the proprietary information of Sun Microsystems, Inc.  
  Use is subject to license terms.
  
--%>

<%@ page import="database.*" %>
<%@ page errorPage="errorpage.jsp" %>
<%!
    private BookDB bookDB; 

    public void jspInit() {	
	bookDB = (BookDB)getServletContext().getAttribute("bookDB");

	if (bookDB == null) {
		try {
			bookDB = new BookDB();
			getServletContext().setAttribute("bookDB", bookDB);
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		}
	}	
}

	 public void jspDestroy() {
 	try {
 		bookDB.remove();
	} catch (Exception ex) {
		System.out.println(ex.getMessage());			
	}
	  getServletContext().removeAttribute("bookDB");
	  bookDB = null;
	 }
%>