JSP制作后台登录页面：login.jsp

江山如画 • 2020年12月6日下午1:47 • 编程开发 • 阅读 3876

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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