实现多个 UserDetailsService 报错分析

如果我们直接实现多个 UserDetailsService，启动项目之后去访问登录则会显示 No AuthenticationProvider found for org.springframework.security.authentication.UsernamePasswordAuthenticationToken

我们可以看下 UserDetailsService Bean 初始化相关的内容，在类 InitializeUserDetailsManagerConfigurer 中可以看到，如果有多个 UserDetailService 存在，则不会给全局的 AuthenticationManager 设置 AuthenticationProvider，因为他是一个 provider 对应一个 UserDetailService，现在我们想要两组，所以我们就需要自己定义 AuthenticationManager

配置多数据源

pom.xml

<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>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.70</version>
    </dependency>
</dependencies>

IndexController（登录成功后访问的接口）

/**
 * @ClassName IndexController
 * @Desciption 首页控制层
 * @Author MaRui
 * @Date 2023/8/10 18:00
 * @Version 1.0
 */
@RestController
public class IndexController {

    /**
     * 从 SecurityContextHolder 获取信息
     * @return
     */
    @GetMapping(value = "/")
    public String index() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        return JSON.toJSONString(authentication);
    }
}

多个 UserDetailsService 实现，这里直接固定判断用户名称返回结果

@Service
public class UserDetailServiceImpl implements UserDetailsService {

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        if (!"marui".equals(username)) {
            throw new UsernameNotFoundException(username);
        }
        UserDetails userDetails = User.withUsername("marui").password("{noop}1234").roles("admin").build();
        return userDetails;
    }
}

@Service
public class UserDetailService2Impl implements UserDetailsService {

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        if (!"marui2".equals(username)) {
            throw new UsernameNotFoundException(username);
        }
        UserDetails userDetails = User.withUsername("marui2").password("{noop}1234").roles("admin").build();
        return userDetails;
    }
}

SecurityConfig 中配置 AuthenticationManager

/**
 * @ClassName SecurityConfig
 * @Desciption Security 配置
 * @Author MaRui
 * @Date 2023/9/18 17:29
 * @Version 1.0
 */
@Configuration
public class SecurityConfig {

    @Bean
    public AuthenticationManager authenticationManager(){
        DaoAuthenticationProvider provider = new DaoAuthenticationProvider();
        provider.setUserDetailsService(new UserDetailServiceImpl());
        DaoAuthenticationProvider provider2 = new DaoAuthenticationProvider();
        provider2.setUserDetailsService(new UserDetailService2Impl());
        return new ProviderManager(provider2,provider);
    }
}

验证一下，访问登录页面 http://127.0.0.1:8080/login，输入账号 marui，密码 1234

登录成功，返回了获取到的当前用户信息