form提交的参数问题?
dyz2 2003-05-28 10:00:15 不论输入框中是否填入数值,用request.getParameter获得的值都不为null?
怎么回事? 源码如下
----------form file-----------
<html>
<head>
<title>index page</title>
</head>
<body>
<form action=hello.jsp method=get>
firstname:<input type="text" name="firstname"
value="default">
<input type="submit" value="login" >
</form>
</body>
</html>
------------hello.jsp---------
<html>
<head>
<title>hello page</title>
</head>
<body>
<%if (request.getParameter("firstname")==null){
out.println("Please enter your name.");
}%>
</body>
</html>