开发工具：
java编辑器eclipse
服务器环境：tomcat
HTML编辑器：Hbuilder
数据库管理系统：sqlyog
数据库：mysql
项目架构：
1.servlet 类
2.service类
3.dao类
4.entity类
5.utils类
需要依赖的文件：
mysql驱动包、dbutils驱动包、c3p0驱动包、mchange驱动包
配置文件：c3p0.properties
创建数据库，创建表：
搭建页面：
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!--引入bootstrap核心的css文件-->
<link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
<!--因为bootstrap核心的js问价依赖于jquery，所以应该有限导入jquery文件-->
<script type="text/javascript" src="js/jquery-3.1.1.js"></script>
<!--引入bootstrap核心的js文件-->
<script type="text/javascript" src="js/bootstrap.js"></script>
<style>
div{
width:350px;
margin:auto;
}
.container {
margin-top: 120px;
padding-bottom: 20px;
}
.mylogin {
width: 350px;
padding: 20px;
padding-top: 5px;
margin: 0 auto;
border: 1px solid #eee;
background-color: #fafad2;
}
h3 {
margin-bottom: 20px;
}
</style>
</head>
<body>
<%
//获取cookie
Cookie[] cookies = request.getCookies();
if(cookies !=null && cookies.length != 0){
for(Cookie c:cookies){
//如何获取cookies的名称getName以及值getValue();
if("username".equals(c.getName())){
pageContext.setAttribute("username", c.getValue());
}
if("pwd".equals(c.getName())){
pageContext.setAttribute("pwd", c.getValue());
}
}
}
%>
<div style="float:left;">
<span style="color:red;">${msg }</span>
</div>
<div>
<form action="user" class="post">
<h3 class="text-center">用户登录</h3>
<div class="form-group">
<div class="input-group">
<div class="input-group-addon">
<span>姓名：</span>
</div>
<input type="text" value="${username }" name="username" class="form-control" required>
</div>
</div>
<div class="form-group">
<div class="input-group">
<div class="input-group-addon">
<span>密码：</span>
</div>
<input type="password" value="${pwd }" name="pwd" class="form-control" required>
</div>
</div>
<input type="submit" class="btn btn-primary form-control">
</form>
</div>
</body>
</html>main.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<!--要转么创建一个页面来判断时候登录 -->
<jsp:include page="check.jsp"></jsp:include>
<h1>欢迎来到本系统</h1>
欢迎您,${user.username }
</body>
</html>check.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="com.offcn.entity.User"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
/*
通过存储在session中的关键字user的获取数据
*/
User user = (User)session.getAttribute("user");
if(user == null){
request.setAttribute("msg", "请您先登录");
%>
<jsp:forward page="login.jsp"></jsp:forward>
<%
}
%>
</body>
</html>Class页面：
com.offcn.entity包下的User.java类
package com.offcn.entity;
public class User {
private int uid;
private String username;
private String pwd;
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public User(int uid, String username, String pwd) {
super();
this.uid = uid;
this.username = username;
this.pwd = pwd;
}
public User(String username, String pwd) {
super();
this.username = username;
this.pwd = pwd;
}
public User() {
// TODO Auto-generated constructor stub
}
}com.offcn.servlet包下的UserServlet.java类
package com.offcn.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.offcn.entity.User;
import com.offcn.service.UserService;
@WebServlet("/user")
public class UserServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取登录数据
String username = request.getParameter("username");
String pwd = request.getParameter("pwd");
//创建user类进行传输
User user = new User(username,pwd);
HttpSession session = request.getSession();
boolean isSuccess = new UserService().login(user,session);
if(isSuccess) {
//获取cookie的值
//获取用户名
Cookie cookie1 = new Cookie("username", username);
//获取密码
Cookie cookie2 = new Cookie("pwd", pwd);
//设置cookie的存活时间默认，默认生命周期是浏览器会话结束，单位是秒
cookie1.setMaxAge(60*60*2);
cookie2.setMaxAge(2*60*60);
//将cookies响应给浏览器
response.addCookie(cookie1);
response.addCookie(cookie2);
//跳转页面
request.setAttribute("user", user);
request.getRequestDispatcher("main.jsp").forward(request, response);
}else {
request.setAttribute("msg", "用户名或者密码输入错误");
request.getRequestDispatcher("login.jsp").forward(request, response);
}
}
}com.offcn.service包下的UserService.java类
package com.offcn.service;
import javax.servlet.http.HttpSession;
import com.offcn.dao.UserDao;
import com.offcn.entity.User;
public class UserService {
public boolean login(User user, HttpSession session) {
User u = new UserDao().login(user);
if(u != null) {
//将登陆状态也就是user对象存储在session中
session.setAttribute("user", u);
return true;
}
return false;
}
}
com.offcn.dao包下的UserDao.java类
package com.offcn.dao;
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.offcn.entity.User;
public class UserDao {
public User login(User user) {
QueryRunner qRunner = new QueryRunner(new ComboPooledDataSource());
User u = null;
try {
u = qRunner.query("select * from user where username=? and pwd=?",
new BeanHandler<User>(User.class),user.getUsername(),user.getPwd());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return u;
}
}com.offcn.utils包下的DateTest.java类
package com.offcn.utils;
import java.util.Date;
public class DateTest {
public static void main(String[] args) {
Date date = new Date();
System.out.println(date);
java.sql.Date date2 = new java.sql.Date(System.currentTimeMillis());
System.out.println(date2);
}
}c3p0.properties配置文件：
c3p0.driverClass=com.mysql.jdbc.Driver
c3p0.jdbcUrl=jdbc:mysql://localhost:3306/user
c3p0.user=root
c3p0.password=root这里附上源码+所用jar包：
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