SpringBoot+mybatis+thymeleaf实现登录功能示例

1.项目文件目录一栏

2.开始工作

先按照上图建立好相应的controller,mapper等文件。
接着进行一个配置
首先是application.properties

server.port=8080#启动端口
#加载Mybatis配置文件
mybatis.mapper-locations = classpath:mapper/*.xml

#数据源必填项
spring.datasource.driver-class-name= com.mysql.cj.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/studentmanage?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT
spring.datasource.username = root
spring.datasource.password = 123456

接着是spring启动主函数java文件

/*扫描mapper,防止找不到dao层文件，就写上*/
@MapperScan(basePackages = {"com.example.learn.Dao"})
@SpringBootApplication
public class LearnApplication {

  public static void main(String[] args) {
    SpringApplication.run(LearnApplication.class, args);
  }

}

配置好以后开始从数据库出发

用户表结构(表名：user_info)

根据用户表，在entity建立实体类User.java,编译器都有相应的操作可以一键生成getter,setter,toString,只需定义好变量即可。

public class User {
  private String username;
  private String password;

  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;
  }

  @Override
  public String toString() {
    return "User{" +
        "username='" + username + '\'' +
        ", password='" + password + '\'' +
        '}';
  }
}

接着是Dao层

import com.example.learn.Entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Component;

@Mapper
@Component(value = "userDao")//这些都为配置注释
public interface UserDao {
	//登录
  public User login(@Param("username") String username,@Param("password") String password);
}

dao层写完，在写dao层配套的sql语句(mybatis功能)
mapper包里面建立.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="com.example.learn.Dao.UserDao">
  <select id="login" resultType="com.example.learn.Entity.User">
    select * from user_info where username=#{username} and password=#{password}
  </select>
</mapper>

弄完这些接着到service层，包括impl接口实现
首先是service接口

import com.example.learn.Entity.User;

public interface UserService {
  public User login(String username, String password);
}

接着是Impl下的实现类

import com.example.learn.Dao.UserDao;
import com.example.learn.Entity.User;
import com.example.learn.Service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service("UserService")
public class UserServiceImpl implements UserService {
  @Autowired
  private UserDao userDao;
  @Override
  public User login(String username, String password) {
    return userDao.login(username,password);
  }
}

最后就是Controller

import com.example.learn.Entity.User;
import com.example.learn.Service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;

import javax.servlet.http.HttpServletRequest;

@Controller
public class UserController {
  @Autowired
  private UserService userService;
  @PostMapping("/login")//可以换成@RequestMapping,action那里使用的命名
  public String login(HttpServletRequest request, User u){
    String username=request.getParameter("username");
    String password=request.getParameter("password");
    u=userService.login(username,password);
    if(u!=null){
      return "success";//到success的动态网页
    }
    return "redirect:/login.html";//这里是定向到login.html静态网页
  }
}

3.测试工作

先在表中插入测试数据用户和密码
再建立两个html来测试功能
static/login.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>登陆</title>
</head>
<body>
  <form method="post" action="/login">
    <input type="text" name="username" placeholder="用户名">
    <input type="password" name="password" placeholder="密码">
    <input type="submit" value="登录">
  </form>
</body>
</html>

templates/success

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
成功
</body>
</html>

登录测试

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