创建CounterSerlet, 使用getServletContext，ServletContext 从request.getSession().getServletContext();获得
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@WebServlet
(
"/CounterServlet"
)
public
class
CounterServlet
extends
HttpServlet {
private
static
final
long
serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public
CounterServlet() {
super
();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected
void
doGet(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
ServletContext context = request.getSession().getServletContext();
if
(
null
== context.getAttribute(
"counter"
)){
context.setAttribute(
"counter"
,
1
);
}
else
{
int
count = (Integer)context.getAttribute(
"counter"
);
context.setAttribute(
"counter"
, count +
1
);
}
request.getRequestDispatcher(
"counter.jsp"
).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected
void
doPost(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
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2. counter.jsp
jsp里对应的对象就是application
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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!
DOCTYPE
html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<
html
>
<
head
>
<
meta
http-equiv="Content-Type" content="text/html; charset=UTF-8">
<
title
>Insert title here</
title
>
</
head
>
<
body
>
<%= application.getAttribute("counter") %>
</
body
>
</
html
>
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本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/p/7689807.html，如需转载请自行联系原作者
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