- 设计数据库employee，manager表,字段：user_id (主键，自增1,int类型),user_name, password
- 创建数据源:employee_dsn
- 制作登录页面login.jsp
登录页面 login.jsp代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>www.xin126.cn原创：JSP制作登录页面：login.jsp</title>
<script language="javascript">
<!--
function check() { //验证用户名字段是否为空
username= document.form1.username.value;
if (username == "")
{ alert("请输入用户名");
document.form1.username.focus();
return false;
} else{
//验证密码字段是否为空
password = document.form1.password.value;
if (password == "") {
alert("请输入登陆密码");
document.form1.password.focus();
return false; }
}
}
-->
</script>
</head>
<body>
<form name="form1" method="post" action="login_check.jsp">
用户名：<input name="username" type="text" >
密码： <input name="password" type="text" >
<input type="submit" name="Submit" value="登录" onClick="return check()">
<input type="reset" name="Submit2" value="重填">
</form>
</body>
</html>
提交后登录验证页面：login_check.jsp核心代码如下：
<%@ page language="java" import="java.sql.*" pageEncoding="gb2312"%>
<% String username=request.getParameter("username");
String password=request.getParameter("password");
Connection con;
Statement sql;
ResultSet rs;
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}catch(ClassNotFoundException e)
{ out.print(e);
}
try {
con=DriverManager.getConnection("jdbc:odbc:employee_dsn","sa","2005");
sql=con.createStatement();
rs=sql.executeQuery("select * from manager where user_name='"+username+"' and password='"+password+"'");
if(rs.next())
{ session.setAttribute("login","true");
response.sendRedirect("admin.jsp");
}else{ %>
<script language="javascript">
<!--
alert("用户名或密码错误！");
window.location="login.jsp";
-->
</script>
<% }
con.close();
}
catch(SQLException e)
{ out.print(e);
}
%>
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