书接上文，我想实现sendRedirect()和getRequestDispatcher()在跳转后是否携带值。
实现的jsp代码：
<%@ page language="java" import="java.util.*" contentType="text/html;charset=gb2312"%>
<html>
<head>
<%-- <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>--%>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
<form id="r_form" action="${pageContext.request.contextPath}/" method="get" >
用户名：<input type="text" name="username"/><br/>
密 码：<input type="password" name="password"/><br/>
<input type="submit" value="redirect" id="redirect" onclick="check('redirect')">
<input type="submit" value="request" id="request" onclick="check('request')">
</form>
<script>
function check(value) {
if (value=='redirect'){
document.getElementById("r_form").action="${pageContext.request.contextPath}/redirect";
} else if (value=='request'){
document.getElementById("r_form").action="${pageContext.request.contextPath}/request";
}
}
</script>
</body>
</html>
