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制作一个银行卡用户登录页面，提交后连接数据库进行登录验证，根据验证结果跳转到不同页面

2016-10-29 11:35 926 查看

<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>

<form action="check.jsp" method="post"><!--action里面写要转的jsp页面  -->
卡号：<input type="text" name="cardid"><br>
密码：<input type="password" name="password"><br>
<input type="submit" value="登陆"><br>

</form>

</body>
</html>

check.jsp ojdbc6.jar 放lib里

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.PreparedStatement"%>
<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!--这个页面是
接收用户输入的卡号和密码，进行验证，验证需要连数据库
request对象负责接收-->

<%
//接收数据
String cardid=request.getParameter("cardid");
String password=request.getParameter("password");
//前两部接收数据，接受完了，就该验证数据
//一定要确定数据收到了
//数据验证     检查用户名 密码
if(cardid==null||password==null
||cardid.equals("")||password.equals(""))//得保证都有数据？？？
{
out.write("请正确登陆系统");
}
else
{
out.write(cardid);
out.write(password);
}

//连接数据库
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn=DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:orcl",
"test0816","123456");
PreparedStatement ps=conn.prepareStatement(
"select * from t_bankcard where cardid=?"
+"and password=? and state='1'");
ps.setString(1,cardid);
ps.setString(2,password);

ResultSet rs=ps.executeQuery();

if(rs.next())
{
out.write("用户名和密码正确");
}
else
{
out.write("用户名或密码错误");
}
//释放资源
rs.close();
ps.close();
conn.close();
%>

</body>
</html>

<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>

<form action="check2.jsp" method="post"><!--action里面写要转的jsp页面  -->
卡号：<input type="text" name="cardid"><br>
密码：<input type="password" name="password"><br>
<input type="submit" value="登陆"><br>

</form>

</body>
</html>

CardDAO.java 建在java Resources src 包下面

package com.hanqi.web;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class CardDAO {

private ComboPooledDataSource cpds=new ComboPooledDataSource("helloc3p0");
//通过配置文件构建连接池对象
public boolean checkLogin(String cardid,String password)
{
boolean rtn=false;

try {
Connection conn=cpds.getConnection();

PreparedStatement ps=conn.prepareStatement(
"select * from t_bankcard where cardid=?"
+"and password=? and state='1'");
ps.setString(1,cardid);
ps.setString(2,password);

ResultSet rs=ps.executeQuery();

rtn=rs.next();//

} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}

return rtn;
}

}

check2.jsp webContent

<%@page import="com.hanqi.web.CardDAO"%>
<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>

<%
String cardid=request.getParameter("cardid");
String password=request.getParameter("password");

if(cardid==null||password==null
||cardid.equals("")||password.equals(""))
{
out.write("请正确登陆");
}
else
{
//检查登陆信息
CardDAO cd=new CardDAO();

if(cd.checkLogin(cardid,password))
{
out.write("登陆成功");
}
else
{
out.write("登陆失败");
}

}

%>
</body>
</html>

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