要实现连接数据库的javaee编译的简易WEB登陆界面，要首先安装JAVA EE、SQL Server 2008和Tomcat等软件，并将环境进行配置。
1、建数据库与数据表
2、打开JAVA EE，开始创建WEB项目。
3、右键点击WebContent-New-JSP File，新建jsp(动态)文件。（注意路径）
4、login.jsp
<%@ page import="java.sql.*" 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=utf-8">
<title>登录界面</title>
</head>
<body>
<center>
<h1 style="color:red">登录</h1>
<form id="indexform" name="indexForm" action="logincheck.jsp" method="post">
<table border="0">
<tr>
<td>账号：</td>
<td><input type="text" name="username"></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" name="password">
</td>
</tr>
</table>
<br>
<input type="submit" value="登录" style="color:#BC8F8F">
</form>
<form action="logon.jsp">
<input type="submit" value="注册" style="color:#BC8F8F">
</form>
</center>
</body>
</html>
loginsuccess.jsp
<%@ page import="java.sql.*" 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>
<h1>登录成功 </h1>
</body>
</html>
logincheck.jsp
<%@ page import="java.sql.*" 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=utf-8"> <title>Insert title here</title> </head> <body> <jsp:useBean id="db" class="Bean.DBBean" scope="page"/> <% request.setCharacterEncoding("UTF-8"); String username=(String)request.getParameter("username"); String password=(String)request.getParameter("password");//取出login.jsp的值 //下面是数据库操作 *代表所有值 String sql="select * from Table_1 where username="+"'"+username+"'";//定义一个查询语句 ResultSet rs=db.executeQuery(sql);//运行上面的语句 if(rs.next()) { /* if(password.equals(rs.getString(2))) { } */ if(password.equals(rs.getObject("password"))){ response.sendRedirect("loginsuccess.jsp"); } else{ out.print("<script language='javaScript'> alert('密码错误');</script>"); response.setHeader("refresh", "0;url=login.jsp"); } } else { out.print("<script language='javaScript'> alert('请输入用户名——else');</script>"); response.setHeader("refresh", "0;url=login.jsp"); } %> </body> </html>
5、执行
