UserDetailsService 介绍

UserDetailsService 在 Spring Security 中主要承担查询系统内用户、验证密码、封装用户信息和角色权限。大白话就是你写一个实现类实现 UserDetailsService 接口，在这个实现类中去查询数据库中的用户，并封装成一个实现了 UserDetails 接口的实体类模型。

UserDetailsService 具体操作

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.security.mysql.dao.UserDao;
import com.security.mysql.entity.UserEntity;
import com.security.user.UserDetailsInfo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;@Component
@Slf4j
public class UserDetailsServiceImpl implements UserDetailsService {// TODO 这里改成你自己的服务或者Dao查询@Autowiredprivate UserDao userDao;@Overridepublic UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {log.info("进入 loadUserByUsername ...");// TODO 查询系统内的用户LambdaQueryWrapper<UserEntity> wrapper = new LambdaQueryWrapper<>();wrapper.eq(UserEntity::getUsername, username);UserEntity userEntity = userDao.selectOne(wrapper);if (userEntity == null) {// 未查询到用户throw new RuntimeException("not find user");}// TODO 封装成实现了 UserDetails 接口的实体类模型return UserDetailsInfo.builder().id(userEntity.getId()).username(userEntity.getUsername()).password(userEntity.getPassword()).build();}}

UserDetailsService 方法介绍

方法名	作用
UserDetails loadUserByUsername(String username)	根据用户名加载用户信息

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