Servlet之cookie的作用范围

cookie2.jsp
<%@ 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>
	<%
		String cookieValue = null;
		Cookie [] cookies = request.getCookies();
		if(cookies!=null && cookies.length>0){
			
			for(Cookie cookie:cookies){
				if("cookiePath".equals(cookie.getName())){
					cookieValue = cookie.getValue();
				}
			}
		}
		
		if(cookieValue!=null){
			
			out.print(cookieValue);
			
		}else{
			out.print("没有指定的cookie");
		}
	%>
</body>
</html>

writerCook.jsp
<%@ 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>
	<!-- 向客户端浏览器写入一个cookie:cookiePath,cookiePathValue -->
	<%
		Cookie cookie = new Cookie("cookiePath","cookiePathValue");
		//设置cookie的作用范围
		cookie.setPath(request.getContextPath());
		response.addCookie(cookie);
		
		//Cookie的作用范围:可以作用于当前目录和当前目录的子目录,但不能作用于当前目录的上一级目录
		//可以通过setPath方法来设置Cookie的作用范围,其中"/"代表站点的根目录
	%>
	<a href="../cookie2.jsp">To Read Cookie</a>
	
</body>
</html>


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