📄 importattribute.jsp

📁 servlet与jsp核心编程书籍源码部分

💻 JSP

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- 
Example of the import attribute of the page directive. 
   
Taken from Core Servlets and JavaServer Pages
from Prentice Hall and Sun Microsystems Press,
http://www.coreservlets.com/.
&copy; 2000 Marty Hall; may be freely used or adapted.
-->
<HTML>
<HEAD>
<TITLE>The import Attribute</TITLE>
<LINK REL=STYLESHEET
      HREF="JSP-Styles.css"
      TYPE="text/css">
</HEAD>

<BODY>
<H2>The import Attribute</H2>
<%-- JSP page directive --%>
<%@ page import="java.util.*,coreservlets.*" %>

<%-- JSP Declaration (see Section 10.4) --%>
<%!
private String randomID() {
  int num = (int)(Math.random()*10000000.0);
  return("id" + num);
}

private final String NO_VALUE = "<I>No Value</I>";
%>

<%-- JSP Scriptlet (see Section 10.3) --%>
<%
Cookie[] cookies = request.getCookies();
String oldID = 
  ServletUtilities.getCookieValue(cookies, "userID", NO_VALUE);
String newID;
if (oldID.equals(NO_VALUE)) {
  newID = randomID();
} else {
  newID = oldID;
}
LongLivedCookie cookie = new LongLivedCookie("userID", newID);
response.addCookie(cookie);
%>

<%-- JSP Expressions (see Section 10.2) --%>
This page was accessed at <%= new Date() %> with a userID
cookie of <%= oldID %>.

</BODY>
</HTML>

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