jsp中cookie应用简单的实例，jsp新建cookie对象，判断与设置cookie：
<%@ page language=”java” pageEncoding=”UTF-8″ %>
<jsp:directive.page import=”java.net.URLEncoder”/>
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
<html>
<head>
<title>Cookie</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=”css/style.css”>
</head>
<body>
<%!
// 返回字符串是否为空
boolean isNull(String str){
return str==null || str.trim().length()==0;
}
%>
<%
// 设置request编码
request.setCharacterEncoding(“UTF-8″);
// 如果是POST提交数据
if(“POST”.equals(request.getMethod())){
// 获取name参数
String name = request.getParameter(“name”);
// 获取value参数
String value = request.getParameter(“value”);
// 获取maxAge参数
String maxAge = request.getParameter(“maxAge”);
// 获取domain参数
String domain = request.getParameter(“domain”);
// 获取path参数
String path = request.getParameter(“path”);
// 获取comment参数
String comment = request.getParameter(“comment”);
// 获取secure参数
String secure = request.getParameter(“secure”);
// 如果name参数不为空
if(!isNull(name)){
// 则生成新的Cookie
Cookie cookie = new Cookie(
URLEncoder.encode(name, “UTF-8″),
URLEncoder.encode(value, “UTF-8″));
// 若maxAge非空则设置maxAge属性
if(!isNull(maxAge)) cookie.setMaxAge(Integer.parseInt(maxAge));
// 若domain非空则设置domain
if(!isNull(domain)) cookie.setDomain(domain);
// 若path非空则设置path
if(!isNull(path)) cookie.setPath(path);
// 设置comment
if(!isNull(comment)) cookie.setComment(comment);
if(!isNull(secure)) cookie.setSecure(“true”.equalsIgnoreCase(secure));
// 覆盖旧的Cookie
response.addCookie(cookie);
}
}
%>
<div align=”center” style=”margin:10px; “>
<fieldset>
<legend>当前有效的 Cookie</legend>
<script type=”text/javascript”>
document.write(document.cookie);
</script>
</fieldset>
<fieldset>
<legend>设置新 Cookie</legend>
<form action=”jsp_cookie.jsp” method=”POST”>
<table>
<tr><td>name: </td>
<td><input name=”name” type=”text” style=”width:200px; “></td>
</tr>
<tr><td>value: </td>
<td><input name=”value” type=”text” style=”width:200px; “></td>
</tr>
<tr><td>maxAge: </td>
<td><input name=”maxAge” type=”text” style=”width:200px; “></td>
</tr>
<tr><td>domain: </td>
<td><input name=”domain” type=”text” style=”width:200px; “></td>
</tr>
<tr><td>path: </td>
<td><input name=”path” type=”text” style=”width:200px; “></td>
</tr>
<tr><td>comment: </td>
<td><input name=”comment” type=”text” style=”width:200px; “></td>
</tr>
<tr><td>secure: </td>
<td><input name=”secure” type=”text” style=”width:200px; “></td>
</tr>
<tr><td></td>
<td><input type=”submit” value=” 提 交 ” class=”button”>
<input type=”button” value=” 刷 新 ” onclick=”location=’jsp_cookie.jsp’”>
</td>
</tr>
</table>
</form>
</fieldset>
</div>
</body>
</html>