SpringBoot+MyBatis实现登录案例

1.创建一个springboot项目

2.创建表

create database login;
 
use login;
 
 
create table userlogin(
username varchar(49),
password varchar(49)
)

3.idea连接mysql

4. 创建实体类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.创建mapper。数据持久层userloginmapper接口

@mapper
@repository
public interface userloginmapper {
 
    //定义增删改查方法
 
    //查询所有
    public list<userlogin> queryall();
    //添加数据
 
    public int add(userlogin userlogin);
 
    //根据用户名查询
 
    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 id="queryall" resulttype="自己的实体类接口">
  select * from userlogin
 </select>
 <insert id="add" parametertype="自己的实体类接口">
  insert into userlogin values (#{username},#{password})
 </insert>
 <select id="querybyusername" resulttype="自己的实体类接口">
  select * from userlogin where username=#{username}
 </select>
</mapper>

7.编写userlogservice接口

public interface userlonginservice {
    public interface userloginservicesl {
        //查询所有
        public list<userlogin> queryall();
        //添加数据
        public int add(userlogin userlogin);
        //根据用户名查询
        public userlogin querybyusername(string username);
    }
}

8.编写控制层mycontroller

@controller
public class mycontroller {
 //controller层调用service层
 //创建一个service层对象
 @autowired
 userloginservicesimpl userloginservices;
 
 //登录
 @requestmapping("/tologin")
 public string tologin() {
  return "login";
 }
 
 @requestmapping("/loginsuccess")
 public string loginsuccess(model model, userlogin userlogin) {
  //查询用户名是否存在
  userlogin userlogin1 = userloginservices.querybyusername(userlogin.getusername());
  if (userlogin1 != null) { //如果用户名存在
   if (userlogin1.getpassword().equals(userlogin.getpassword())) {
    system.out.println(userlogin1.tostring());
    return "success";
   } else {
    model.addattribute("data", "密码不正确");
    return "login";
   }
 
  } else { //用户名不存在，直接返回到登录页面
   model.addattribute("data", "该用户不存在，请先注册");
   return "login";
  }
 }
 
 
 //注册
 @requestmapping("/toregister")
 public string toregister() {
  return "register";
 }
 
 @requestmapping("/toregistersuccess")
 public string toregistersuccess(model model,userlogin userlogin) {
  //添加一条记录到数据库中
  int add = userloginservices.add(userlogin);
  system.out.println("插入数据成功");
  model.addattribute("data","注册成功，请登录");
  return "login";
 
 }
}

9.前端页面

10.login.html 登录的页面

<!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>登录界面</h2><br><br>
 <span th:text="${data}" style="text-color:red;font-size: 10px"></span>
 <form method="get" action="/loginsuccess">
  用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br>
  密码：<input type="text" name="password" placeholder="请输入密码" required/><br><br>
  <input type="submit" value="登录">
 </form>
 <br>
 <form method="get" action="/toregister">
  <input type="submit" value="注册">
 </form>
</div>
</body>
</html>

11.注册界面

<!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>注册界面</h1><br><br>
 <form method="get" action="/toregistersuccess">
  用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br>
  密码：<input type="text" name="password" placeholder="请输入密码" required/><br><br>
  确认密码：<input type="text" name="password2" placeholder="请输入密码" required/><br><br>
  <input type="submit" value="注册">
 </form>
</div>
</body>
</html>

success.html：成功页面

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