Cookie对象和response对象练习

利用Cookie进行两个页面的传值,CookieP1.jsp显示一个数的平方，Cookie显示这个输的立方，代码如下：

<%@ 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 'CookieP1.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>
     <%
    //定义一个变量
    String str="12";
    int number=Integer.parseInt(str);
     %>
     该数的平方为：<%=number*number %><hr>
     <%
        //将str存入Cookie对象
        Cookie cookie=new Cookie("number",str);
        //设置Cookie的存活期为 600秒
        cookie.setMaxAge(600);
        //将Cookie对象保存于客户端
        response.addCookie(cookie);
      %>
      <a href="CookieP2.jsp">到达CookiesP2.jsp</a>
  </body>
</html>

CookieP2.jsp，详细代码如下：

<%@ 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 'CookieP2.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>
  <% 
    //从Cookie获得number
    String str=null;
    Cookie[] cookies=request.getCookies();
    for(int i=0;i<cookies.length;i++){
       if(cookies[i].getName().equals("number")){
           str=cookies[i].getValue();
           break;
       }
    }
     int number=Integer.parseInt(str);
    %>
    该数字的立方为：<%=number*number*number%><hr>
  </body>
</html>

点击上图到达CookisP2.jsp：

response和jsp动作指令进行跳转页面的对比:练习

responseTest1.jsp页面代码：

<%@ 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 'requestTest1.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>
    <form action="responseTest2.jsp">
                        输入学生的姓名：<input type="text" name="stuname">
        <input type="submit" value="查询">
    </form>
  </body>
</html>

responseTest2.jsp，代码如下：

<%@ 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 'responseTest2.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>
     <%
        //第一种方式跳转页面
        //response.sendRedirect("responseTest3.jsp");
       
      %>
      /*第二种方式跳转页面*/
       <jsp:forward page="responseTest3.jsp"></jsp:forward>
  </body>
</html>

首先利用jsp动作进行跳转页面：

点击查询：

地质栏地址不变

数据能够共享

把responseTest2.jsp里面的代码更换

点击查询：

发现地址栏改变，数据不能共享

Cookie对象和response对象练习

猜你喜欢