Java response 重定向页面如何带参数使用response对象进行重定向

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mob6454cc77db30 2024-02-02 07:12:43

response对象

response对象用于响应客户端请求，向客户输出信息。他封装了JSP产生的响应，并发送到客户端以响应客户端请求。

1.重定向网页

使用response对象的sendRedirect()方法可以将网页重定向到另一个页面。重定向支持将地址重定向到不同的主机上，这一点与转发不同。在客户端浏览器上将会得到跳转后的地址，并重新发送请求链接；用户可以从浏览器的地址栏中看到跳转后的地址；重定向操作后，request中的属性将会全部失效，并开始一个新的request对象

sendRedirect()方法的语法格式如下：

response.sendRedirect(String path);

参数说明：

path：指定的目标地址，可以是相对路径，也可以是不同主机的其他URL地址

范例：

定义index.jsp重定向到Login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%response.sendRedirect("Login.jsp"); %>
 
<!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>
<br>
</body>
</html>

定义Login.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 'Login.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  name="form1" method="post" action="">
<input name="name" type="text" id="name" style="width:120px"><br/><br/>
<input name="pass" type="password" id="pass" style="width:120px"><br/>
<br/>
<input type="submit" name="submit" value="提交">
</form>
</body>
</html>

2.处理HTTP头文件

response对象可以设置HTTP响应包头，其中最常用的是禁用缓存，设置页面自动刷新和定时跳转页面。

禁用缓存

默认情况下，浏览器将会显示的网页的内容进行缓存，可以通过response对象来实现对缓存的禁用。

范例：

修改Login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
response.setHeader("Catch-control", "no-store");
response.setDateHeader("Expires", 0);
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
    
<title>My JSP 'Login.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  name="form1" method="post" action="">
<input name="name" type="text" id="name" style="width:120px"><br/><br/>
<input name="pass" type="password" id="pass" style="width:120px"><br/>
<br/>
<input type="submit" name="submit" value="提交">
</form>
</body>
</html>

设置页面定时跳转

范例：

修改index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
"refresh", "5;URL=hello.jsp");
%>
 
<!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>
<br>
</body>
</html>

设置页面定时刷新