cookie它是用户访问Web服务器时，服务器在用户硬盘上存放的信息。
1.使用Servlet实现cookie
@WebServlet("/CookieServlet")
public class CookieServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private int count1;
private int count2;
public CookieServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Cookie cookie = new Cookie("cookieName" +count1++, "cookieValue" + count2++);
cookie.setMaxAge(15);
response.addCookie(cookie);
Cookie[] cookies = request.getCookies();
if (cookies == null) {
return;
}
for(Cookie cook : cookies){
System.out.println("cookie name: " +cook.getName());
System.out.println("cookie value: " +cook.getValue());
}
}
/**
* @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);
}
}
cookie的设值方法： response.addCookie(cookie)
cookie的取值方法：Cookie[] cookies = request.getCookies();
2. 使用Jsp实现Cookie
<%@ 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>
<%! int count1 = 0;
int count2 = 0;
%>
<%
Cookie cookie = new Cookie("cookieName"+ count1++, "cookieValue" +count2++);
cookie.setMaxAge(15);
response.addCookie(cookie);
%>
<%
Cookie[] cookies = request.getCookies();
if(null == cookie){
return;
}
for(Cookie c : cookies){
%>
<p>
<b>cookie name: <%= c.getName() %><b><br>
<b>cookie value: <%= c.getValue() %></b>
</p>
<%
}
%>
</body>
</html>