SpringBoot+MyBatis實現登錄案例
1.創建一個SpringBoot項目
2.創建表
create database login; use login; create table userlogin(username varchar(49),password varchar(49))
3.idea連接mysql
4. 創建實體類UserLogin
@Data@AllArgsConstructor@NoArgsConstructor@Table(name = 'userlogin')/*<dependency> <groupId>javax.persistence</groupId> <artifactId>persistence-api</artifactId> <version>1.0</version></dependency>*/public class UserLogin { private String username; private String password;}
5.創建mapper。數據持久層UserLoginMapper接口
@Mapper@Repositorypublic interface UserLoginMapper { //定義增刪改查方法 //查詢所有 public List<UserLogin> queryAll(); //添加數據 public int add(UserLogin userLogin); //根據用戶名查詢 public UserLogin queryByUsername(String username);}
6.在resources下建UserLoginMapper.xml文件
<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE mapper PUBLIC '-//mybatis.org//DTD Mapper 3.0//EN' 'http://mybatis.org/dtd/mybatis-3-mapper.dtd'><mapper namespace='自己的mapper接口'> <select resultType='自己的實體類接口'> select * from userlogin </select> <insert parameterType='自己的實體類接口'> insert into userlogin values (#{username},#{password}) </insert> <select resultType='自己的實體類接口'> select * from userlogin where username=#{username} </select></mapper>
7.編寫UserLogService接口
public interface UserLonginService { public interface UserLoginServicesl {//查詢所有public List<UserLogin> queryAll();//添加數據public int add(UserLogin userLogin);//根據用戶名查詢public UserLogin queryByUsername(String username); }}
8.編寫控制層MyController
@Controllerpublic class MyController { //controller層調用service層 //創建一個service層對象 @Autowired UserLoginServicesImpl userLoginServices; //登錄 @RequestMapping('/toLogin') public String toLogin() { return 'login'; } @RequestMapping('/loginSuccess') public String loginSuccess(Model model, UserLogin userLogin) { //查詢用戶名是否存在 UserLogin userLogin1 = userLoginServices.queryByUsername(userLogin.getUsername()); if (userLogin1 != null) { //如果用戶名存在 if (userLogin1.getPassword().equals(userLogin.getPassword())) { System.out.println(userLogin1.toString()); return 'success'; } else { model.addAttribute('data', '密碼不正確'); return 'login'; } } else { //用戶名不存在，直接返回到登錄頁面 model.addAttribute('data', '該用戶不存在，請先注冊'); return 'login'; } } //注冊 @RequestMapping('/toRegister') public String toRegister() { return 'register'; } @RequestMapping('/toRegisterSuccess') public String toRegisterSuccess(Model model,UserLogin userLogin) { //添加一條記錄到數據庫中 int add = userLoginServices.add(userLogin); System.out.println('插入數據成功'); model.addAttribute('data','注冊成功，請登錄'); return 'login'; }}
9.前端頁面
10.login.html 登錄的頁面
<!DOCTYPE html><html lang='en' xmlns:th='http://www.thymeleaf.org'><head> <meta charset='UTF-8'> <title>login</title></head><body background='back.jpg'><div align='center'> <br><br><h2>登錄界面</h2><br><br> <span th:text='${data}' style='text-color:red;font-size: 10px'></span> <form method='get' action='/loginSuccess'> 用戶名:<input type='text' name='username' placeholder='請輸入用戶名' required/><br><br> 密碼：<input type='text' name='password' placeholder='請輸入密碼' required/><br><br> <input type='submit' value='登錄'> </form> <br> <form method='get' action='/toRegister'> <input type='submit' value='注冊'> </form></div></body></html>
11.注冊界面
<!DOCTYPE html><html lang='en' xmlns:th='http://www.thymeleaf.org'><head> <meta charset='UTF-8'> <title>register</title></head><body background='back.jpg' ><div align='center'> <br><br><h1>注冊界面</h1><br><br> <form method='get' action='/toRegisterSuccess'> 用戶名:<input type='text' name='username' placeholder='請輸入用戶名' required/><br><br> 密碼：<input type='text' name='password' placeholder='請輸入密碼' required/><br><br> 確認密碼：<input type='text' name='password2' placeholder='請輸入密碼' required/><br><br> <input type='submit' value='注冊'> </form></div></body></html>
success.html：成功頁面
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