Servlet实现登录注册
1.注册页面register.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册页面</title>
<script type="text/javascript">
function sub(){
alert("注册成功!");
}
</script>
<style>
*{
margin: 0px;
padding: 0px;
box-sizing: border-box;
}
body{
background: url("img/timg.jpg") no-repeat center;
background-size: 100%;
}
.rg_layout{
width: 900px;
height: 620px;
border: 5px solid #F3E2A9;
background-color: white;
/* 让div水平居中*/
margin: auto;
margin-top: 15px;
}
.rg_left{
float: left;
margin: 20px;
}
.rg_left > p:first-child{
color: #FFBF00;
font-size: 20px;
}
.rg_left>p:last-child{
color: #A4A4A4;
font-size: 20px;
}
.rg_center{
float: left;
width: 500px;
}
.rg_right{
float: right;
margin:20px;
}
.rg_right p{
font-size:13px;
}
.rg_right p a{
color: #FFBF00;
}
.td_left{
width: 100px;
text-align: right;
height: 30px;
}
.td_right{
padding: 20px;
}
#username,#password,#Email,#name,#tel,#checked{
width: 250px;
height: 30px;
border:1px solid #A4A4A4 ;
border-radius:5px;
padding-left:8px;
}
/*#checked{*/
/* width: 120px;*/
/*}*/
/*#img_check{*/
/* height:30px;*/
/* vertical-align: middle;*/
/*}*/
#btn_sub{
width: 100px;
height: 30px;
background-color: #0080FF;
border: 1px solid #0080FF;
}
</style>
</head>
<body>
<div class="rg_layout">
<div class="rg_left">
<p>新用户注册</p>
<p>USER REGISTER</p>
</div>
<div class="rg_center">
<div class="rg_form">
<form action="/register" method="post">
<table>
<tr>
<td class="td_left"><label for="username">用户名</label></td>
<td class="td_right"><input type="text" name="username" id="username" placeholder="请输入用户名"></td>
</tr>
<tr>
<td class="td_left"><label for="password">密码</label></td>
<td class="td_right"><input type="password" name="password" id="password" placeholder="请输入密码"></td>
</tr>
<tr>
<td class="td_left"><label for="Email">邮箱</label></td>
<td class="td_right"><input type="email" name="Email" id="Email" placeholder="请输入邮箱"></td>
</tr>
<tr>
<td class="td_left"><label for="name">姓名</label></td>
<td class="td_right"><input type="text" name="name" id="name" placeholder="请输入真实姓名"></td>
</tr>
<tr>
<td class="td_left"><label for="tel">手机号</label></td>
<td class="td_right"><input type="number" name="tel" id="tel" placeholder="请输入手机号"></td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" id="btn_sub" value="注册" onclick="sub()">
</td>
</tr>
</table>
</form>
</div>
</div>
<div class="rg_right">
<p>已有账户?<a href="login.html">立即登录</a></p>
</div>
</div>
</body>
2.登录页面 login.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
* {
margin: 0px;
}
body{
background-image: url("img/login.png");
background-size: 100%;
}
.box{
width: 400px;
height: 300px;
margin:200px auto;
display:block;
position: relative;
}
.btn_style{
width: 100px;
height: 30px;
display: block;
position:absolute;
text-decoration:none;
text-align:center;
line-height:30px;
color: #fff;
background-color: #058;
}
#btn_reset:HOVER {
background-color: #047;
}
#btn_login:hover{
background-color: #047;
}
#btn_reset{
right:50px;
}
#btn_login{
margin-left: 50px;
}
</style>
<script type="text/javascript">
function register() {
window.location.href="register.html";
}
</script>
</head>
<body>
<div align="center" class="box">
<form id="form"method="post" action="/login">
userName:<input type="text" name="username" id="username" placeholder="请输入用户名"/><br>
password :<input type="password" name="password" id="password" placeholder="请输入密码"/><br/>
<tr>
<td><input class="btn_style" id="btn_login" type="submit" value="登录"></td>
<td><input type="button" id="btn_reset" class="btn_style" value="注册" onclick="register()"></td>
</tr>
</form>
</div>
</body>
</html>
3.实体类
package cn.frame.domin;
public class User {
private String username;
private String password;
private String Email;
private String name;
private String tel;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return Email;
}
public void setEmail(String email) {
Email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTel() {
return tel;
}
public void setTel(String tel) {
this.tel = tel;
}
}
4.Dao层UserDao类
package cn.frame.dao;
import cn.frame.domin.User;
import java.sql.*;
public class UserDao {
private static final String driver="com.mysql.cj.jdbc.Driver";
private static final String url="jdbc:mysql://localhost:3306/rg_log?serverTimezone=UTC&characterEncoding=utf-8&useSSL=false";
private static String username="root";
private static String password="hao20001010";
public static void insert(User user) throws SQLException {
String sql="insert into rgister values(?,?,?,?,?)";
Connection connection = null;
PreparedStatement statement = null;
try {
//加载驱动
Class.forName(driver);
connection = DriverManager.getConnection(url, username, password);
//创建预编译的Statement
statement = connection.prepareStatement(sql);
//设置参数
statement.setString(1,user.getUsername());
statement.setString(2,user.getPassword());
statement.setString(3,user.getEmail());
statement.setString(4,user.getName());
statement.setString(5,user.getTel());
statement.executeUpdate();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
statement.close();
connection.close();
}
}
public boolean select(String username2,String password2) throws SQLException {
Connection connection=null;
Statement statement=null;
String username1;
String password1;
String sql="select username,password from rgister";
try {
ResultSet rs = null;
Class.forName(driver);
connection = DriverManager.getConnection(url, username, password);
statement= connection.createStatement();
rs=statement.executeQuery(sql);
while (rs.next()) {
username1 = rs.getString("username");
password1 = rs.getString("password");
if (username1.equals(username2) && password1.equals(password2)) {
return true;
}
}
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
statement.close();
connection.close();
}
return false;
}
}
5.Servlet控制层（RegistServlet类，LoginServlet类，FailServlet类，SuccessServlet类）
package cn.frame.web.servlet;
import cn.frame.dao.UserDao;
import cn.frame.domin.User;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
@WebServlet("/register")
public class RegistServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
String Email = request.getParameter("Email");
String name = request.getParameter("name");
String tel = request.getParameter("tel");
//SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd");
//Date date=format.parse(date);
User user = new User();
user.setUsername(username);
user.setPassword(password);
user.setEmail(Email);
user.setName(name);
user.setTel(tel);
try {
UserDao.insert(user);
} catch (SQLException e) {
e.printStackTrace();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
package cn.frame.web.servlet;
import cn.frame.dao.UserDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
UserDao userDao=new UserDao();
try {
if (userDao.select(username,password)){
request.getRequestDispatcher("/success").forward(request,response);
}else {
request.getRequestDispatcher("/fail").forward(request,response);
}
} catch (SQLException e) {
e.printStackTrace();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
package cn.frame.web.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/fail")
public class FailServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
response.getWriter().write("登录失败，用户名或密码错误");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
package cn.frame.web.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/success")
public class SuccessServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
response.getWriter().write("恭喜你登录成功！");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
6、总结
第一步：编写前端页面代码（register.html,login.html)
第二步：编写代码实现与数据库的交互（UserDao类）
第三步：使用Servlet接收表单数据（RegistServlet类，LoginServlet类）
第五步：将图片中的分隔线去掉，对于注册，可以将Servlet接收的数据封装到实体类User中，然后调用Dao层类中编写的insert()方法集合即可；对于登录可以通过调用Dao层类中编写的select()方法与接收的表单数据进行比对即可
重点在于第五步的使用
所用的技术：
Servlet、JDBC
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