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login.jsp内容:
<%@ page language="java" contentType="text/html;charset=gb2312"%>
<html>
<head>
<title>登陆</title>
</head>
<body>
<form method="POST" name="frmLogin" action="LoginServlet">
<h1 align="center">用户登录</h1><br />
<center>
<table border=1>
<tr>
<td>用户名:</td>
<td>
<input type="text" name="username" value="Your name" size="20" maxlength="20" onfocus="if (this.value=='Your name') this.value='';" />
</td>
</tr>
<tr>
<td>密 码:</td>
<td>
<input type="password" name="password" value="Your password" size="20" maxlength="20" onfocus="if (this.value=='Your password') this.value='';" />
</td>
</tr>
<tr>
<td>
<input type="submit" name="Submit" value="提交" onClick="return validateLogin()" />
</td>
<td>
<input type="reset" name="Reset" value="重置" />
</td>
</tr>
</table>
</center>
</form>
<script language="javascript">
function validateLogin(){
var sUserName = document.frmLogin.username.value ;
var sPassword = document.frmLogin.password.value ;
if ((sUserName =="") || (sUserName=="Your name")){
alert("请输入用户名!");
return false ;
}
if ((sPassword =="") || (sPassword=="Your password")){
alert("请输入密码!");
return false ;
}
}
</script>
</body>
</html>