设置登录的用户名和密码

1.通过配置文件设置用户名密码

spring:security:user:name: xiankejinpassword: 123456

如果没有以上配置，那么就会在后台生成一个随机密码，用户名固定位user。

2.通过配置类设置用户名密码

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter{@Overrideprotected void configure(AuthenticationManagerBuilder auth) throws Exception {//将密码加密处理BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder();String encode = bCryptPasswordEncoder.encode("123456");auth.inMemoryAuthentication().withUser("Lucy").password(encode).roles("admin");}@Beanpublic PasswordEncoder passwordEncoder() {return new BCryptPasswordEncoder();}
}

3.自定义实现类设置用户名密码

spring security中的用户接口UserDetails和实现类User

User类中的构造器（用户名，密码，权限集合） 

定义配置类继承WebSecurityConfigurerAdapter类

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter{@Autowiredprivate UserDetailsService userDetailsService;@Overrideprotected void configure(AuthenticationManagerBuilder auth) throws Exception {auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());}@Beanpublic PasswordEncoder passwordEncoder() {return new BCryptPasswordEncoder();}
}

定义类实现UserDetailsService接口

@Service("userDetailsService")
public class MyUserDetailsService implements UserDetailsService {@Overridepublic UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {List<GrantedAuthority> authorities =AuthorityUtils.commaSeparatedStringToAuthorityList("role");return new User("Marry", new BCryptPasswordEncoder().encode("123456"), authorities);}
}

这里就可以写入查询数据库的验证用户的逻辑

引入mybatisplus + mysql 坐标：

 <dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.0.5</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency>

spring:datasource:username: rootdriver-class-name: com.mysql.jdbc.Driverpassword: 123456url: jdbc:mysql://localhost:3306/demo
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

@Repository
public interface UsersMapper extends BaseMapper<Users> {}

@Data
public class Users {private Long id;private String username;private String password;}

@Service("userDetailsService")
public class MyUserDetailsService implements UserDetailsService {@Autowiredprivate UsersMapper usersMapper;@Overridepublic UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {LambdaQueryWrapper<Users> wrapper = new LambdaQueryWrapper<>();wrapper.eq(Users::getUsername, username);Users users = usersMapper.selectOne(wrapper);if(null == users) {throw new UsernameNotFoundException("用户名不存在");}List<GrantedAuthority> authorities =AuthorityUtils.commaSeparatedStringToAuthorityList("role");return new User(users.getUsername(), new BCryptPasswordEncoder().encode(users.getPassword()), authorities);}
}

@SpringBootApplication
@MapperScan("com.xkj.org.mapper")
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}
}