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专注于Java后端开发。 不断总结，举一反三。
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Jsp Cookie

Posted on 2017-10-19 12:19  work hard work smart  阅读(203)  评论(0)  编辑  收藏  举报

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>