initdestroy.jsp

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;
	 }
%>