集成 Spring Security 组件，重构后，整体逻辑更加清晰

src/main/java/cn/iocoder/dashboard/modules/system/dal/mysql/dao/package-info.java

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+package cn.iocoder.dashboard.modules.system.dal.mysql.dao;

src/main/java/cn/iocoder/dashboard/modules/system/dal/mysql/dao/user/SysUserMapper.java

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+package cn.iocoder.dashboard.modules.system.dal.mysql.dao.user;
+
+import cn.iocoder.dashboard.modules.system.dal.mysql.dataobject.user.SysUserDO;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface SysUserMapper extends BaseMapper<SysUserDO> {
+
+    default SysUserDO selectByUsername(String username) {
+        return selectOne(new QueryWrapper<SysUserDO>().eq("username", username));
+    }
+
+}

src/main/java/cn/iocoder/dashboard/modules/system/dal/mysql/dataobject/user/SysUserDO.java

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+package cn.iocoder.dashboard.modules.system.dal.mysql.dataobject.user;
+
+import java.util.Date;
+import java.util.List;
+import javax.validation.constraints.Email;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+
+import cn.iocoder.dashboard.framework.excel.Excel;
+import cn.iocoder.dashboard.framework.excel.Excels;
+import cn.iocoder.dashboard.framework.mybatis.core.BaseDO;
+import cn.iocoder.dashboard.modules.system.dal.mysql.dataobject.dept.SysDept;
+import cn.iocoder.dashboard.modules.system.dal.mysql.dataobject.permission.SysRole;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+
+/**
+ * 用户 DO
+ *
+ * @author ruoyi
+ */
+@TableName("sys_user")
+@Data
+@EqualsAndHashCode(callSuper = true)
+// TODO 芋艿：数据库的字段默认值
+public class SysUserDO extends BaseDO {
+
+    /**
+     * 用户ID
+     */
+    @TableId
+    @Excel(name = "用户序号", cellType = Excel.ColumnType.NUMERIC, prompt = "用户编号")
+    private Long userId;
+
+    /**
+     * 部门ID
+     */
+    @Excel(name = "部门编号", type = Excel.Type.IMPORT)
+    private Long deptId;
+
+    /**
+     * 用户账号
+     */
+    @Excel(name = "登录名称")
+    @NotBlank(message = "用户账号不能为空")
+    @Size(max = 30, message = "用户账号长度不能超过30个字符")
+    private String username;
+
+    /**
+     * 加密后的密码
+     *
+     * 因为目前使用 {@link BCryptPasswordEncoder} 加密器，所以无需自己处理 salt 盐
+     */
+    private String password;
+
+    /**
+     * 用户昵称
+     */
+    @Excel(name = "用户名称")
+    @Size(max = 30, message = "用户昵称长度不能超过30个字符")
+    private String nickname;
+
+    /**
+     * 用户邮箱
+     */
+    @Excel(name = "用户邮箱")
+    @Email(message = "邮箱格式不正确")
+    @Size(max = 50, message = "邮箱长度不能超过50个字符")
+    private String email;
+
+    /**
+     * 手机号码
+     */
+    @Excel(name = "手机号码")
+    @Size(max = 11, message = "手机号码长度不能超过11个字符")
+    private String mobile;
+
+    /**
+     * 用户性别
+     */
+    @Excel(name = "用户性别", readConverterExp = "0=男,1=女,2=未知")
+    private String sex;
+
+    /**
+     * 用户头像
+     */
+    private String avatar;
+
+    /**
+     * 帐号状态（0正常 1停用）
+     */
+    @Excel(name = "帐号状态", readConverterExp = "0=正常,1=停用")
+    // TODO 芋艿：修改成枚举
+    private String status;
+
+    /**
+     * 最后登录IP
+     */
+    @Excel(name = "最后登录IP", type = Excel.Type.EXPORT)
+    private String loginIp;
+
+    /**
+     * 最后登录时间
+     */
+    @Excel(name = "最后登录时间", width = 30, dateFormat = "yyyy-MM-dd HH:mm:ss", type = Excel.Type.EXPORT)
+    private Date loginDate;
+
+
+    // TODO FROM 芋艿：下面的字段，需要忽略
+
+    /**
+     * 部门对象
+     */
+    @Excels({
+            @Excel(name = "部门名称", targetAttr = "deptName", type = Excel.Type.EXPORT),
+            @Excel(name = "部门负责人", targetAttr = "leader", type = Excel.Type.EXPORT)
+    })
+    @TableField(exist = false)
+    private SysDept dept;
+
+    /**
+     * 角色对象
+     */
+    @TableField(exist = false)
+    private List<SysRole> roles;
+
+    /**
+     * 角色组
+     */
+    @TableField(exist = false)
+    private Long[] roleIds;
+
+    /**
+     * 岗位组
+     */
+    @TableField(exist = false)
+    private Long[] postIds;
+
+    // TODO 芋艿：后续清理掉
+    public boolean isAdmin() {
+        return isAdmin(this.userId);
+    }
+
+    public static boolean isAdmin(Long userId) {
+        return userId != null && 1L == userId;
+    }
+
+}