使用request对象中的sendRedirect()方法实现重定向（网页跳转）到另一个页面。
格式：request.sendRedirect("*.jsp");
与转发的区别：前者可以跳转到任一个地址的页面，后者只能在本网站内跳转。前者带着request中的信息跳 转，后者不带。
示例：用户在登录界面输入登录名和密码，输入正确和错误分别跳转到不同的页面。
代码：
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<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 action="receive.jsp" method="post">
姓名：<input type="text" name="rdname"><br>
密码：<input type="text" name="rdpasswd"><br>
<input type="submit" value="确定">
</form>
</body>
</html登录后复制
receive.jsp
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'receive.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>
<% String name=request.getParameter("rdname");
String passwd=request.getParameter("rdpasswd");
if(name.equals("abcd")&&passwd.equals("123456")){
%>
<jsp:forward page="correct.jsp"/>
<%}else{%>
<% response.sendRedirect("http://sohu.com");}%>
</body>
</html>登录后复制
correct.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'correct.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>
<% String name=request.getParameter("rdname"); %>
欢迎，<%=name %>成功登陆！
</body>
</html>登录后复制
运行结果（正确）：
运行结果（错误）：
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