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534

Appendix A

Servlet and JSP Quick Reference

  response: the 

HttpServletResponse

 associated with response to 

client.

  out: the 

JspWriter

 (

PrintWriter

 subclass) used to send output to the 

client.

  session: the 

HttpSession

 object associated with request. See Chapter 

9.

  application: the 

ServletContext

 as obtained by 

getServletConfig().getContext()

. Shared by all servlets and JSP 

pages on server or in Web application. See Section 15.1.

  config: the 

ServletConfig

 object for this page. 

  pageContext: the 

PageContext

 object associated with current page. 

See Section 13.4 for a discussion of its use.

  page: synonym for 

this

 (current servlet instance); not very useful now. 

Placeholder for future.

A.11 The JSP page Directive: Structuring 

Generated Servlets

The import Attribute

<%@ page import="package.class" %>

<%@ page import="package.class1,...,package.classN" %>

The contentType Attribute

<%@ page contentType="MIME Type" %>

  <%@ page contentType="MIME Type; charset=Character Set" %>

  Cannot be invoked conditionally. Use 

<% response.setContentType("..."); %>

 for that.

Example of Using contentType 

Excel.jsp

<%@ page contentType="application/vnd.ms excel" %>

<%   Note that there are tabs, not spaces, between columns.   %>

1997

1998

1999

2000

2001 (Anticipated)

12.3

13.4

14.5

15.6

16.7

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