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  • 简单的Cookie记录浏览记录案例

    books.jsp

    • 界面

    • 代码
    <%@ page cont
    entType
    ="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Books Page</title> </head> <body> <% //从Cookie中获取浏览记录 Cookie[] cookies = request.getCookies(); if(cookies != null && cookies.length >0 ){ for(Cookie cookie : cookies){ if(cookie.getName().startsWith("Nchu_")){ response.getWriter().println(""+cookie.getValue()); } } } %> <br> <br> <a href="book.jsp?book=JavaWeb">JavaWeb</a><br><br> <a href="book.jsp?book=Java">Java</a><br><br> <a href="book.jsp?book=Orcle">Orcle</a><br><br> <a href="book.jsp?book=Mysql">Mysql</a><br><br> <a href="book.jsp?book=Ajax">Ajax</a><br><br> <a href="book.jsp?book=Spring">Spring</a><br><br> </body> </html>

     book.jsp

    <%@ page import="java.util.List" %>
    <%@ page import="java.util.ArrayList" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>BookDeatil Page</title>
    </head>
    <body>
    <br>
    <br>
    Book: <%= request.getParameter("book")
    %>
    <%
        //通过request获取books页面的请求数据
        String book = request.getParameter("book");
        //获取浏览器一次会话的所有cookie
        Cookie[] cookies = request.getCookies();
        //用于存放匹配“Nchu_”前缀的cookie
        List<Cookie> nchuCookies = new ArrayList<Cookie>();
        //要删除的cookie
        Cookie tempCookie = null;
        if(cookies.length > 0 && cookies != null){
            for(Cookie coo : cookies){
                String cookieName = coo.getName();
                //获取匹配"Nchu_"的cookie
                if(cookieName.startsWith("Nchu_")){
                    nchuCookies.add(coo);
                    if(coo.getValue().equals(book)){
                        tempCookie = coo;
                    }
                }
            }
        }
        //如果匹配的cookie的数量大于等于五,判断tempCookie是否为空,若为空删除第一个,如不为空当前删除
        if(nchuCookies.size() >= 5 && tempCookie == null){
                tempCookie = nchuCookies.get(0);
        }
        //有相同的cookie都要把这个cookie删除
        if(tempCookie != null ){
            tempCookie.setMaxAge(0);
            response.addCookie(tempCookie);
        }
        //将books页面传过来的值放入Cookie中
        Cookie cookie = new Cookie("Nchu_"+book,book);
        response.addCookie(cookie);
    
    %>
    <br>
    <a href="books.jsp">Return</a>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/realshijing/p/7868253.html
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