<%@ page language="java" import="java.util.*" contentType="text/html; charset=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 'LoginForm.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="dologin.jsp" name = "loginForm" method = "post">
<table>
<tr>
<td>用户名:</td>
<td><input type = "text" name = "userName"/></td>
</tr>
<tr>
<td>密码:</td>
<td><input type = "password" name = "passWord"/></td>
</tr>
<tr>
<td colspan = "2"><input type = "button" value = "登录"/></td>
</tr>
</table>
</form>
</body>
</html>
<input type = "button" value = "登录"/>
试着改成：
<input type="submit" value="登录" />
试一试