#mysql 数据库连接
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver 
spring.datasource.url=jdbc:mysql://localhost:3306/demo?serverTimezone=UTC
spring.datasource.username=root 
spring.datasource.password=root

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package com.atguigu.securitydemo1.config;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;@Configuration
public class SecurityConfigTest extends WebSecurityConfigurerAdapter {@Autowiredprivate UserDetailsService userDetailsService;@Overrideprotected void configure(AuthenticationManagerBuilder auth) throws Exception {auth.userDetailsService(userDetailsService).passwordEncoder(password());}@BeanPasswordEncoder password(){return new BCryptPasswordEncoder();}
}

第一步 引入依赖

整合MyBatisPlus完成数据库操作

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--mybatis-plus--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.0.5</version></dependency><!--mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--lombok 用来简化实体类--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency>
</dependencies>

第二步 创建数据库和数据库表

第三步 创建users表对应实体类

package com.atguigu.securitydemo1.entity;import lombok.Data;@Data
public class Users {private Integer id;private String username;private String password;}

第四步 整合mp，创建接口，继承mp的接口

package com.atguigu.securitydemo1.entity;import lombok.Data;@Data
public class Users {private Integer id;private String username;private String password;}

第五步 在MyUserDetailsService调用mapper里面的方法查询数据库进行用户认证

package com.atguigu.securitydemo1.service;import com.atguigu.securitydemo1.entity.Users;
import com.atguigu.securitydemo1.mapper.UsersMapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;import java.util.List;@Service("userDetailsService")
public class MyUserDetailsService implements UserDetailsService {@Autowiredprivate UsersMapper usersMapper;@Overridepublic UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {//调用userMapper方法，根据用户名查询数据库QueryWrapper<Users> wrapper = new QueryWrapper<>();//where username = ?wrapper.eq("username",username);Users users = usersMapper.selectOne(wrapper);//判断if (users==null)//数据库没有用户名，认证失败{throw new UsernameNotFoundException("用户名不存在！");}List<GrantedAuthority> auths = AuthorityUtils.commaSeparatedStringToAuthorityList("rold");return new User(users.getUsername(),new BCryptPasswordEncoder().encode(users.getPassword()),auths);}
}

第六步 在启动类添加注解MapperScan

package com.atguigu.securitydemo1;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
@MapperScan("com.atguigu.securitydemo1.mapper")
public class Securitydemo1Application {public static void main(String[] args) {SpringApplication.run(Securitydemo1Application.class, args);}}