报错信息

‘userDetailsService(T)’ in ‘org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder’ cannot be applied to ‘(com.user_service.service.IUsersService)’

原因

这个错误是因为在 SecurityConfig 配置中，AuthenticationManagerBuilder 的 userDetailsService 方法期待的是实现了 UserDetailsService 接口的类，而你可能传递的是 IUsersService，而它并没有实现 UserDetailsService 接口。

解决方案

要解决这个问题，你有以下几种方式：

1. 实现 UserDetailsService 接口

首先，你需要让 IUsersService 实现 UserDetailsService 接口，以便它能够被 AuthenticationManagerBuilder 使用。

修改 IUsersService 接口和实现类

你可以扩展 IUsersService 接口，使其实现 UserDetailsService，例如：

import org.springframework.security.core.userdetails.UserDetailsService;public interface IUsersService extends IService<Users>, UserDetailsService {// 其他方法声明
}

然后在 UsersServiceImpl 类中实现 UserDetailsService 的 loadUserByUsername 方法：

import com.user_service.entity.Users;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;@Service
public class UsersServiceImpl extends ServiceImpl<UsersMapper, Users> implements IUsersService {@Overridepublic UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {Users user = this.getOne(new QueryWrapper<Users>().eq("username", username));if (user == null) {throw new UsernameNotFoundException("User not found with username: " + username);}return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(),new ArrayList<>());}
}

这样，IUsersService 就实现了 UserDetailsService，可以在 SecurityConfig 中使用。

2. 修改 SecurityConfig

在 SecurityConfig 中，现在可以注入 IUsersService，并将其作为 userDetailsService 使用：

import com.user_service.service.IUsersService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;@Configuration
@EnableWebSecurity
public class SecurityConfig {@Autowiredprivate IUsersService usersService;@Beanpublic AuthenticationManager authenticationManager(HttpSecurity http) throws Exception {return http.getSharedObject(AuthenticationManagerBuilder.class).userDetailsService(usersService) // 这里传入 usersService.passwordEncoder(passwordEncoder()).and().build();}@Beanpublic SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {http.csrf(AbstractHttpConfigurer::disable).authorizeHttpRequests(auth -> auth.requestMatchers("/auth/login", "/auth/register").permitAll().anyRequest().authenticated()).sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS)).addFilterBefore(new JwtAuthenticationFilter(jwtTokenUtil, signatureUtil, usersService), UsernamePasswordAuthenticationFilter.class);return http.build();}@Beanpublic PasswordEncoder passwordEncoder() {return new BCryptPasswordEncoder();}
}

3. 其他注意事项

• 如果你使用了自定义的 UserDetails 实现，确保在 UsersServiceImpl 中的 loadUserByUsername 方法返回了正确的 UserDetails 实例。
• 如果用户的角色或权限信息也存储在 Users 实体中，你需要在 loadUserByUsername 方法中将这些信息转换为 UserDetails 对象。

通过这些修改，你应该能够将 IUsersService 作为 UserDetailsService 使用，并解决上述错误。

仅为个人知识分享及开发中遇到的问题总结，
希望对你有所帮助，若有问题欢迎指正~😊