login(登录).jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/login" οnsubmit="return check()">
<table border="1px">
<tr>
<td>用户名:</td>
<td><input type="text" name="uname" id="uname"></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="password" name="pwd" id="pwd"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="登录"></td>
</tr>
</table>
</form>
</body>
<script>
function check()
{
var uname = document.getElementById("uname").value;
var pwd = document.getElementById("pwd").value;
if(uname==null || uname =='')
{
alert("用户名不能为空!")
return false;
}
if(isNaN(Number(pwd)))
{
alert("请输入正确的数量！")
return false;
}
return true;
}
</script>
</html>