登录端
<%@ 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"> 卡号：<input type="text" name="cardid1"><br> 密码：<input type="password" name="password1"><br> <input type="submit" value="登录"> </form>> </body> </html>
连接请求端
<%@page import="com.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("cardid1"); String password=request.getParameter("password1"); if(cardid==null||password==null||cardid.equals("") || password.equals("")) { out.write("请正确登录系统"); } else { //检查登录信息 cardDAO cd=new cardDAO(); if(cd.checklogin(cardid, password)) { out.write("登录成功"); } else { out.write("登录失败"); } } %> </body> </html>
Java代码类
package com.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 {
ComboPooledDataSource cpd=new ComboPooledDataSource("helloc3p0");
public boolean checklogin(String cardid,String password)
{
boolean boo=false;
try {
Connection conn=cpd.getConnection();
PreparedStatement ps=conn.prepareStatement(
"select * from bank where ba_card=? and ba_password=?");
ps.setString(1, cardid);
ps.setString(2, password);
ResultSet rs=ps.executeQuery();
boo=rs.next();
rs.close();
ps.close();
conn.close();
cpd.close();
} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
return boo;
}
}
原文：http://www.cnblogs.com/tfl-511/p/6010491.html