一、記住瀏覽歷史
list.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<a href="/day-cookie/GServlet?name=BM">BMW</a><br>
<a href="/day-cookie/GServlet?name=AU">AUDI</a><br>
<a href="/day-cookie/GServlet?name=JA">JAC</a><br>
<a href="/day-cookie/GServlet?name=BE">BENZ</a><br>
<a href="/day-cookie/GServlet?name=FO">FORD</a><br>
<a href="/day-cookie/GServlet?name=BUI">BUICK</a><br>
瀏覽歷史:${cookie.hi.value}
</body>
</html>
CUtils.java
public class CUtils {
public static Cookie getByName(HttpServletRequest request, String name) {
Cookie cookie = null;
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (Cookie c : cookies) {
if (name.equals(c.getName())) {
cookie = c;
}
}
}
return cookie;
}
}GServlet.java
public class GServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("name");
Cookie his = CUtils.getByName(request, "hi");
if (his != null) {
if (!his.getValue().contains(name)) {
his = new Cookie("hi", his.getValue() + "," + name);
}
} else {
his = new Cookie("hi", name);
}
response.addCookie(his);
response.sendRedirect("/day-cookie/history/list.jsp");
}
}
