feat(auth): 实现多租户切换功能

- 在前端AppLayout中添加租户选择下拉框组件
- 实现switchTenant API接口用于租户间切换
- 更新登录流程以支持租户信息存储和解析
- 修改后端认证服务以支持租户上下文管理
- 添加租户权限验证和访问控制逻辑
- 重构权限查询以基于当前租户进行过滤
- 更新数据访问层以正确处理租户隔离
- 添加租户切换相关的状态管理和UI显示

backend/src/main/java/com/imeeting/auth/JwtAuthenticationFilter.java

@@ -69,17 +69,22 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
         if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
           // 1. Validate User Status (Ignore Tenant isolation here)
           SysUser user = sysUserMapper.selectByIdIgnoreTenant(userId);
-          if (user == null || user.getStatus() != 1 || user.getIsDeleted() ) {
-              response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "User account is disabled or deleted");
+          if (user == null || user.getStatus() != 1 || user.getIsDeleted() != 0) {
+              response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+              response.setContentType("application/json;charset=UTF-8");
+              response.getWriter().write("{\"code\":\"401\",\"msg\":\"User account is disabled or deleted\"}");
               return;
           }
 
           // 2. Validate Tenant Status & Grace Period
           // Skip validation for system platform tenant (ID=0)
-          if (tenantId != null && !Long.valueOf(0).equals(tenantId)) {
-              SysTenant tenant = sysTenantMapper.selectByIdIgnoreTenant(tenantId);
+          Long activeTenantId = tenantId;
+          if (activeTenantId != null && !Long.valueOf(0).equals(activeTenantId)) {
+              SysTenant tenant = sysTenantMapper.selectByIdIgnoreTenant(activeTenantId);
               if (tenant == null || tenant.getStatus() != 1) {
-                  response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Tenant is disabled");
+                  response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+                  response.setContentType("application/json;charset=UTF-8");
+                  response.getWriter().write("{\"code\":\"401\",\"msg\":\"Tenant is disabled\"}");
                   return;
               }
               
@@ -89,27 +94,29 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
                       String graceDaysStr = sysParamService.getParamValue("sys.tenant.grace_period_days", "0");
                       int graceDays = Integer.parseInt(graceDaysStr);
                       if (now.isAfter(tenant.getExpireTime().plusDays(graceDays))) {
-                          response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Tenant subscription expired");
+                          response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+                          response.setContentType("application/json;charset=UTF-8");
+                          response.getWriter().write("{\"code\":\"401\",\"msg\":\"Tenant subscription expired\"}");
                           return;
                       }
                   }
               }
           }
 
-          // 3. Get Permissions (With Redis Cache)
-          String permKey = "sys:auth:perm:" + userId;
+          // 3. Get Permissions (With Redis Cache, Key must include tenantId)
+          String permKey = "sys:auth:perm:" + userId + ":" + activeTenantId;
           Set<String> permissions;
           String cachedPerms = redisTemplate.opsForValue().get(permKey);
           if (cachedPerms != null) {
               permissions = Set.of(cachedPerms.split(","));
           } else {
-              permissions = sysPermissionService.listPermissionCodesByUserId(userId);
+              permissions = sysPermissionService.listPermissionCodesByUserId(userId, activeTenantId);
               if (permissions != null && !permissions.isEmpty()) {
                   redisTemplate.opsForValue().set(permKey, String.join(",", permissions), java.time.Duration.ofHours(2));
               }
           }
 
-          LoginUser loginUser = new LoginUser(userId, tenantId, username, user.getIsPlatformAdmin(), permissions);
+          LoginUser loginUser = new LoginUser(userId, activeTenantId, username, user.getIsPlatformAdmin(), permissions);
           
           UsernamePasswordAuthenticationToken authentication =
               new UsernamePasswordAuthenticationToken(loginUser, null, loginUser.getAuthorities());

backend/src/main/java/com/imeeting/auth/dto/TokenResponse.java

@@ -1,13 +1,23 @@
 package com.imeeting.auth.dto;
 
-import lombok.AllArgsConstructor;
+import lombok.Builder;
 import lombok.Data;
+import java.util.List;
 
 @Data
-@AllArgsConstructor
+@Builder
 public class TokenResponse {
   private String accessToken;
   private String refreshToken;
   private long accessExpiresInMinutes;
   private long refreshExpiresInDays;
+  private List<TenantInfo> availableTenants;
+
+  @Data
+  @Builder
+  public static class TenantInfo {
+    private Long tenantId;
+    private String tenantCode;
+    private String tenantName;
+  }
 }

backend/src/main/java/com/imeeting/common/GlobalExceptionHandler.java

@@ -15,6 +15,12 @@ public class GlobalExceptionHandler {
     return ApiResponse.error(ex.getMessage());
   }
 
+  @ExceptionHandler(org.springframework.security.access.AccessDeniedException.class)
+  public ApiResponse<Void> handleAccessDenied(org.springframework.security.access.AccessDeniedException ex) {
+    log.warn("Access denied: {}", ex.getMessage());
+    return ApiResponse.error("无权限操作");
+  }
+
   @ExceptionHandler(Exception.class)
   public ApiResponse<Void> handleGeneric(Exception ex) {
     log.error("Unhandled exception", ex);

backend/src/main/java/com/imeeting/config/MybatisPlusConfig.java

@@ -43,17 +43,18 @@ public class MybatisPlusConfig {
 
       @Override
       public boolean ignoreTable(String tableName) {
-        // System level tables that should not be filtered by tenant_id
-        // and check if current user is platform admin to skip filtering
         Authentication auth = SecurityContextHolder.getContext().getAuthentication();
         if (auth != null && auth.getPrincipal() instanceof LoginUser) {
           LoginUser user = (LoginUser) auth.getPrincipal();
+          // 只有当平台管理员处于系统租户(0)时，才忽略所有过滤。
+          // 如果他切换到了具体租户(>0)，则必须接受过滤，确保只能看到当前租户数据。
           if (Boolean.TRUE.equals(user.getIsPlatformAdmin()) && Long.valueOf(0).equals(user.getTenantId())) {
             return true; 
           }
         }
         
-        return List.of("sys_tenant", "sys_permission", "sys_role_permission", "sys_user_role", "sys_dict_type", "sys_dict_item", "sys_param").contains(tableName.toLowerCase());
+        // 公共表始终忽略过滤
+        return List.of("sys_tenant", "sys_user", "sys_tenant_user", "sys_permission", "sys_role_permission", "sys_user_role", "sys_dict_type", "sys_dict_item", "sys_param").contains(tableName.toLowerCase());
       }
     }));
     return interceptor;
@@ -67,7 +68,7 @@ public class MybatisPlusConfig {
         strictInsertFill(metaObject, "createdAt", LocalDateTime::now, LocalDateTime.class);
         strictInsertFill(metaObject, "updatedAt", LocalDateTime::now, LocalDateTime.class);
         strictInsertFill(metaObject, "status", () -> 1, Integer.class);
-        strictInsertFill(metaObject, "isDeleted", () -> Boolean.FALSE, Boolean.class);
+        strictInsertFill(metaObject, "isDeleted", () -> 0, Integer.class);
       }
 
       @Override

backend/src/main/java/com/imeeting/controller/AuthController.java

@@ -74,6 +74,15 @@ public class AuthController {
     return ApiResponse.ok(authService.refresh(request.getRefreshToken()));
   }
 
+  @PostMapping("/switch-tenant")
+  public ApiResponse<TokenResponse> switchTenant(@RequestParam Long tenantId, @RequestHeader("Authorization") String authorization) {
+    String token = authorization.replace("Bearer ", "");
+    var claims = jwtTokenProvider.parseToken(token);
+    Long userId = claims.get("userId", Long.class);
+    String deviceCode = claims.get("deviceCode", String.class);
+    return ApiResponse.ok(authService.switchTenant(userId, tenantId, deviceCode));
+  }
+
   @PostMapping("/logout")
   public ApiResponse<Void> logout(@RequestHeader("Authorization") String authorization) {
     String token = authorization.replace("Bearer ", "");

backend/src/main/java/com/imeeting/controller/PermissionController.java

@@ -34,8 +34,7 @@ public class PermissionController {
 
   @GetMapping("/me")
   public ApiResponse<List<SysPermission>> myPermissions() {
-    // Implementation can use SecurityContext to get current userId
-    return ApiResponse.ok(sysPermissionService.listByUserId(getCurrentUserId()));
+    return ApiResponse.ok(sysPermissionService.listByUserId(getCurrentUserId(), getCurrentTenantId()));
   }
 
   @GetMapping("/tree")
@@ -46,7 +45,7 @@ public class PermissionController {
 
   @GetMapping("/tree/me")
   public ApiResponse<List<PermissionNode>> myTree() {
-    return ApiResponse.ok(buildTree(sysPermissionService.listByUserId(getCurrentUserId())));
+    return ApiResponse.ok(buildTree(sysPermissionService.listByUserId(getCurrentUserId(), getCurrentTenantId())));
   }
 
   @GetMapping("/{id}")
@@ -97,6 +96,14 @@ public class PermissionController {
     return null;
   }
 
+  private Long getCurrentTenantId() {
+    org.springframework.security.core.Authentication authentication = org.springframework.security.core.context.SecurityContextHolder.getContext().getAuthentication();
+    if (authentication != null && authentication.getPrincipal() instanceof com.imeeting.security.LoginUser) {
+      return ((com.imeeting.security.LoginUser) authentication.getPrincipal()).getTenantId();
+    }
+    return null;
+  }
+
   private String validateParent(SysPermission perm) {
     if (perm.getLevel() == null) {
       return null;

backend/src/main/java/com/imeeting/controller/UserController.java

@@ -28,22 +28,35 @@ public class UserController {
   private final PasswordEncoder passwordEncoder;
   private final JwtTokenProvider jwtTokenProvider;
   private final SysUserRoleMapper sysUserRoleMapper;
+  private final com.imeeting.service.SysTenantUserService sysTenantUserService;
 
-  public UserController(SysUserService sysUserService, PasswordEncoder passwordEncoder, JwtTokenProvider jwtTokenProvider, SysUserRoleMapper sysUserRoleMapper) {
+  public UserController(SysUserService sysUserService, PasswordEncoder passwordEncoder, JwtTokenProvider jwtTokenProvider, SysUserRoleMapper sysUserRoleMapper, com.imeeting.service.SysTenantUserService sysTenantUserService) {
     this.sysUserService = sysUserService;
     this.passwordEncoder = passwordEncoder;
     this.jwtTokenProvider = jwtTokenProvider;
     this.sysUserRoleMapper = sysUserRoleMapper;
+    this.sysTenantUserService = sysTenantUserService;
   }
 
   @GetMapping
   @PreAuthorize("@ss.hasPermi('sys_user:list')")
   public ApiResponse<List<SysUser>> list(@RequestParam(required = false) Long tenantId, @RequestParam(required = false) Long orgId) {
-    LambdaQueryWrapper<SysUser> query = new LambdaQueryWrapper<>();
-    if (orgId != null) {
-      query.eq(SysUser::getOrgId, orgId);
+    Long currentTenantId = getCurrentTenantId();
+    if (Long.valueOf(0).equals(currentTenantId) && tenantId == null) {
+        List<SysUser> allUsers = sysUserService.list();
+        // 为每个用户加载其租户关系
+        if (allUsers != null && !allUsers.isEmpty()) {
+            for (SysUser user : allUsers) {
+                user.setMemberships(sysTenantUserService.listByUserId(user.getUserId()));
             }
-    return ApiResponse.ok(sysUserService.list(query));
+        }
+        return ApiResponse.ok(allUsers);
+    }
+    Long targetTenantId = tenantId != null ? tenantId : currentTenantId;
+    if (targetTenantId == null) {
+        return ApiResponse.error("Tenant ID required");
+    }
+    return ApiResponse.ok(sysUserService.listUsersByTenant(targetTenantId, orgId));
   }
 
   @GetMapping("/me")
@@ -55,7 +68,7 @@ public class UserController {
     LoginUser loginUser = (LoginUser) authentication.getPrincipal();
     Long userId = loginUser.getUserId();
     
-    SysUser user = sysUserService.getById(userId);
+    SysUser user = sysUserService.getByIdIgnoreTenant(userId);
     if (user == null) {
       return ApiResponse.error("User not found");
     }
@@ -74,7 +87,19 @@ public class UserController {
   @GetMapping("/{id}")
   @PreAuthorize("@ss.hasPermi('sys_user:query')")
   public ApiResponse<SysUser> get(@PathVariable Long id) {
-    return ApiResponse.ok(sysUserService.getById(id));
+    SysUser user = sysUserService.getByIdIgnoreTenant(id);
+    if (user != null) {
+        user.setMemberships(sysTenantUserService.listByUserId(id));
+    }
+    return ApiResponse.ok(user);
+  }
+
+  private Long getCurrentTenantId() {
+    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
+    if (auth != null && auth.getPrincipal() instanceof LoginUser) {
+      return ((LoginUser) auth.getPrincipal()).getTenantId();
+    }
+    return null;
   }
 
   @PostMapping
@@ -84,7 +109,11 @@ public class UserController {
     if (user.getPasswordHash() != null && !user.getPasswordHash().isEmpty()) {
       user.setPasswordHash(passwordEncoder.encode(user.getPasswordHash()));
     }
-    return ApiResponse.ok(sysUserService.save(user));
+    boolean saved = sysUserService.save(user);
+    if (saved) {
+        sysTenantUserService.syncMemberships(user.getUserId(), user.getMemberships());
+    }
+    return ApiResponse.ok(saved);
   }
 
   @PutMapping("/{id}")
@@ -95,7 +124,11 @@ public class UserController {
     if (user.getPasswordHash() != null && !user.getPasswordHash().isEmpty()) {
       user.setPasswordHash(passwordEncoder.encode(user.getPasswordHash()));
     }
-    return ApiResponse.ok(sysUserService.updateById(user));
+    boolean updated = sysUserService.updateById(user);
+    if (updated) {
+        sysTenantUserService.syncMemberships(id, user.getMemberships());
+    }
+    return ApiResponse.ok(updated);
   }
 
   @DeleteMapping("/{id}")

backend/src/main/java/com/imeeting/entity/BaseEntity.java

@@ -12,8 +12,8 @@ public class BaseEntity {
   private Long tenantId;
   private Integer status;
   
-  @TableLogic
-  private Boolean isDeleted;
+  @TableLogic(value = "0", delval = "1")
+  private Integer isDeleted;
 
   @TableField(fill = FieldFill.INSERT)
   private LocalDateTime createdAt;

backend/src/main/java/com/imeeting/entity/SysDictItem.java

@@ -23,5 +23,5 @@ public class SysDictItem extends BaseEntity {
   private Long tenantId;
 
   @TableField(exist = false)
-  private Boolean isDeleted;
+  private Integer isDeleted;
 }

backend/src/main/java/com/imeeting/entity/SysDictType.java

@@ -21,5 +21,5 @@ public class SysDictType extends BaseEntity {
   private Long tenantId;
 
   @TableField(exist = false)
-  private Boolean isDeleted;
+  private Integer isDeleted;
 }

backend/src/main/java/com/imeeting/entity/SysUser.java

@@ -16,6 +16,14 @@ public class SysUser extends BaseEntity {
   private String phone;
   private String passwordHash;
   
-  private Long orgId;
   private Boolean isPlatformAdmin;
+
+  @com.baomidou.mybatisplus.annotation.TableField(exist = false)
+  private Long tenantId;
+
+  @com.baomidou.mybatisplus.annotation.TableField(exist = false)
+  private Long orgId;
+
+  @com.baomidou.mybatisplus.annotation.TableField(exist = false)
+  private java.util.List<SysTenantUser> memberships;
 }

backend/src/main/java/com/imeeting/mapper/SysPermissionMapper.java

@@ -10,12 +10,14 @@ import java.util.List;
 
 @Mapper
 public interface SysPermissionMapper extends BaseMapper<SysPermission> {
+  @com.baomidou.mybatisplus.annotation.InterceptorIgnore(tenantLine = "true")
   @Select("""
       SELECT DISTINCT p.*
       FROM sys_permission p
       JOIN sys_role_permission rp ON rp.perm_id = p.perm_id
-      JOIN sys_user_role ur ON ur.role_id = rp.role_id
-      WHERE ur.user_id = #{userId}
+      JOIN sys_role r ON r.role_id = rp.role_id
+      JOIN sys_user_role ur ON ur.role_id = r.role_id
+      WHERE ur.user_id = #{userId} AND r.tenant_id = #{tenantId}
       """)
-  List<SysPermission> selectByUserId(@Param("userId") Long userId);
+  List<SysPermission> selectByUserId(@Param("userId") Long userId, @Param("tenantId") Long tenantId);
 }

backend/src/main/java/com/imeeting/mapper/SysUserMapper.java

@@ -21,14 +21,25 @@ public interface SysUserMapper extends BaseMapper<SysUser> {
     @Select("SELECT * FROM sys_user WHERE user_id = #{userId} AND is_deleted = 0")
     SysUser selectByIdIgnoreTenant(@Param("userId") Long userId);
 
+    @InterceptorIgnore(tenantLine = "true")
+    @Select("<script>" +
+        "SELECT u.*, tu.org_id as orgId, tu.tenant_id as tenantId " +
+        "FROM sys_user u " +
+        "JOIN sys_tenant_user tu ON u.user_id = tu.user_id " +
+        "WHERE tu.tenant_id = #{tenantId} " +
+        "<if test='orgId != null'> AND tu.org_id = #{orgId} </if> " +
+        "AND u.is_deleted = 0 AND tu.is_deleted = 0" +
+        "</script>")
+    List<SysUser> selectUsersByTenant(@Param("tenantId") Long tenantId, @Param("orgId") Long orgId);
+
     @InterceptorIgnore(tenantLine = "true")
     @Select("""
-        SELECT u.* 
-        FROM sys_user u 
-        JOIN sys_tenant t ON u.tenant_id = t.id 
-        WHERE u.username = #{username} 
-          AND t.tenant_code = #{tenantCode} 
-          AND u.is_deleted = 0
+        SELECT t.id as tenantId, t.tenant_code as tenantCode, t.tenant_name as tenantName
+        FROM sys_tenant t
+        JOIN sys_tenant_user tu ON t.id = tu.tenant_id
+        JOIN sys_user u ON u.user_id = tu.user_id
+        WHERE u.username = #{username} AND u.is_deleted = 0 AND t.is_deleted = 0
+        ORDER BY t.id ASC
         """)
-    SysUser selectByUsernameAndTenantCode(@Param("username") String username, @Param("tenantCode") String tenantCode);
+    List<com.imeeting.auth.dto.TokenResponse.TenantInfo> selectTenantsByUsername(@Param("username") String username);
 }

backend/src/main/java/com/imeeting/service/AuthService.java

@@ -8,4 +8,5 @@ public interface AuthService {
   TokenResponse refresh(String refreshToken);
   void logout(Long userId, String deviceCode);
   String createDeviceCode(LoginRequest request, String deviceName);
+  TokenResponse switchTenant(Long userId, Long targetTenantId, String deviceCode);
 }

backend/src/main/java/com/imeeting/service/SysPermissionService.java

@@ -7,7 +7,7 @@ import java.util.List;
 import java.util.Set;
 
 public interface SysPermissionService extends IService<SysPermission> {
-  List<SysPermission> listByUserId(Long userId);
+  List<SysPermission> listByUserId(Long userId, Long tenantId);
 
-  Set<String> listPermissionCodesByUserId(Long userId);
+  Set<String> listPermissionCodesByUserId(Long userId, Long tenantId);
 }

backend/src/main/java/com/imeeting/service/SysUserService.java

@@ -12,6 +12,14 @@ public interface SysUserService extends IService<SysUser> {
 
         List<SysUser> listUsersByRoleId(Long roleId);
 
+        SysUser getByIdIgnoreTenant(Long userId);
+
+        List<SysUser> listUsersByTenant(Long tenantId, Long orgId);
+
       }
 
       
+
+    
+
+

backend/src/main/java/com/imeeting/service/impl/AuthServiceImpl.java

@@ -71,20 +71,51 @@ public class AuthServiceImpl implements AuthService {
         validateCaptcha(request.getCaptchaId(), request.getCaptchaCode());
       }
 
-      SysUser user;
-      if (request.getTenantCode() == null || request.getTenantCode().trim().isEmpty()) {
-          // 平台管理登录逻辑 (全局搜索)
-          user = sysUserMapper.selectByUsernameIgnoreTenant(request.getUsername());
-          if (user != null && !Boolean.TRUE.equals(user.getIsPlatformAdmin())) {
-              throw new IllegalArgumentException("非平台管理账号请提供租户编码");
-          }
-      } else {
-          // 租户用户登录逻辑 (按租户搜索)
-          user = sysUserMapper.selectByUsernameAndTenantCode(request.getUsername(), request.getTenantCode().trim());
-      }
+      SysUser user = sysUserMapper.selectByUsernameIgnoreTenant(request.getUsername());
 
       if (user == null || user.getStatus() != 1 || !passwordEncoder.matches(request.getPassword(), user.getPasswordHash())) {
-        throw new IllegalArgumentException("用户名、密码或租户编码错误");
+        throw new IllegalArgumentException("用户名或密码错误");
+      }
+
+      // 获取该用户关联的所有租户
+      java.util.List<TokenResponse.TenantInfo> availableTenants = sysUserMapper.selectTenantsByUsername(user.getUsername());
+      
+      // 如果是平台管理员，且没有在租户列表中，手动添加系统租户(ID=0)
+      if (Boolean.TRUE.equals(user.getIsPlatformAdmin())) {
+          boolean hasSystemTenant = availableTenants.stream().anyMatch(t -> t.getTenantId() == 0L);
+          if (!hasSystemTenant) {
+              availableTenants.add(0, TokenResponse.TenantInfo.builder()
+                  .tenantId(0L).tenantCode("SYSTEM").tenantName("系统平台").build());
+          }
+      }
+
+      if (availableTenants.isEmpty()) {
+          throw new IllegalArgumentException("该账号未关联任何租户");
+      }
+
+      // 确定当前租户：
+      // 1. 如果请求指定了租户，且用户属于该租户，则使用该租户
+      // 2. 否则，如果用户是平台管理员，默认进入系统租户(0)
+      // 3. 否则，使用第一个非0的业务租户
+      Long activeTenantId = null;
+      if (request.getTenantCode() != null && !request.getTenantCode().trim().isEmpty()) {
+          String tc = request.getTenantCode().trim();
+          activeTenantId = availableTenants.stream()
+              .filter(t -> t.getTenantCode().equals(tc))
+              .map(TokenResponse.TenantInfo::getTenantId)
+              .findFirst()
+              .orElseThrow(() -> new IllegalArgumentException("您不属于指定的租户: " + tc));
+      } else {
+          if (Boolean.TRUE.equals(user.getIsPlatformAdmin())) {
+              activeTenantId = 0L;
+          } else {
+              // 优先选择非0的租户
+              activeTenantId = availableTenants.stream()
+                  .map(TokenResponse.TenantInfo::getTenantId)
+                  .filter(id -> id != 0L)
+                  .findFirst()
+                  .orElse(availableTenants.get(0).getTenantId());
+          }
       }
 
       String deviceCode = request.getDeviceCode();
@@ -107,10 +138,11 @@ public class AuthServiceImpl implements AuthService {
       if (deviceCode == null || deviceCode.isEmpty()) {
         deviceCode = "default";
       }
-      TokenResponse tokens = issueTokens(user, deviceCode, accessMinutes, refreshDays);
+      TokenResponse tokens = issueTokens(user, activeTenantId, deviceCode, accessMinutes, refreshDays);
+      tokens.setAvailableTenants(availableTenants);
       cacheRefreshToken(user.getUserId(), deviceCode, tokens.getRefreshToken(), refreshDays);
       
-      recordLoginLog(user.getUserId(), user.getTenantId(), user.getUsername(), 1, "登录成功", System.currentTimeMillis() - start);
+      recordLoginLog(user.getUserId(), activeTenantId, user.getUsername(), 1, "登录成功", System.currentTimeMillis() - start);
       return tokens;
     } catch (Exception e) {
       recordLoginLog(null, null, request.getUsername(), 0, e.getMessage(), System.currentTimeMillis() - start);
@@ -141,6 +173,7 @@ public class AuthServiceImpl implements AuthService {
       throw new IllegalArgumentException("无效的刷新令牌");
     }
     Long userId = claims.get("userId", Long.class);
+    Long tenantId = claims.get("tenantId", Long.class);
     String deviceCode = claims.get("deviceCode", String.class);
     String cached = stringRedisTemplate.opsForValue().get(RedisKeys.refreshTokenKey(userId, deviceCode));
     if (cached == null || !cached.equals(refreshToken)) {
@@ -152,12 +185,54 @@ public class AuthServiceImpl implements AuthService {
     long refreshDays = parseLong(sysParamService.getParamValue("security.token.refresh_ttl_days",
         String.valueOf(refreshDefaultDays)), refreshDefaultDays);
 
-    SysUser user = sysUserService.getById(userId);
-    TokenResponse tokens = issueTokens(user, deviceCode, accessMinutes, refreshDays);
+    SysUser user = sysUserMapper.selectByIdIgnoreTenant(userId);
+    TokenResponse tokens = issueTokens(user, tenantId, deviceCode, accessMinutes, refreshDays);
     cacheRefreshToken(userId, deviceCode, tokens.getRefreshToken(), refreshDays);
     return tokens;
   }
 
+  @Override
+  public TokenResponse switchTenant(Long userId, Long targetTenantId, String deviceCode) {
+    SysUser user = sysUserMapper.selectByIdIgnoreTenant(userId);
+    if (user == null) {
+      throw new IllegalArgumentException("用户不存在");
+    }
+
+    // 校验权限：平台管理员可以直接进入租户0，或者用户确实关联了目标租户
+    boolean hasAccess = false;
+    if (targetTenantId == 0L && Boolean.TRUE.equals(user.getIsPlatformAdmin())) {
+        hasAccess = true;
+    } else {
+        java.util.List<TokenResponse.TenantInfo> tenants = sysUserMapper.selectTenantsByUsername(user.getUsername());
+        hasAccess = tenants.stream().anyMatch(t -> t.getTenantId().equals(targetTenantId));
+    }
+
+    if (!hasAccess) {
+      throw new IllegalArgumentException("您不属于目标租户");
+    }
+
+    long accessMinutes = parseLong(sysParamService.getParamValue("security.token.access_ttl_minutes",
+        String.valueOf(accessDefaultMinutes)), accessDefaultMinutes);
+    long refreshDays = parseLong(sysParamService.getParamValue("security.token.refresh_ttl_days",
+        String.valueOf(refreshDefaultDays)), refreshDefaultDays);
+
+    TokenResponse tokens = issueTokens(user, targetTenantId, deviceCode, accessMinutes, refreshDays);
+    cacheRefreshToken(userId, deviceCode, tokens.getRefreshToken(), refreshDays);
+    
+    // 重新获取该用户关联的所有租户信息返回
+    java.util.List<TokenResponse.TenantInfo> availableTenants = sysUserMapper.selectTenantsByUsername(user.getUsername());
+    if (Boolean.TRUE.equals(user.getIsPlatformAdmin())) {
+        boolean hasSystemTenant = availableTenants.stream().anyMatch(t -> t.getTenantId() == 0L);
+        if (!hasSystemTenant) {
+            availableTenants.add(0, TokenResponse.TenantInfo.builder()
+                .tenantId(0L).tenantCode("SYSTEM").tenantName("系统平台").build());
+        }
+    }
+    tokens.setAvailableTenants(availableTenants);
+    
+    return tokens;
+  }
+
   @Override
   public void logout(Long userId, String deviceCode) {
     stringRedisTemplate.delete(RedisKeys.refreshTokenKey(userId, deviceCode));
@@ -169,15 +244,10 @@ public class AuthServiceImpl implements AuthService {
       validateCaptcha(request.getCaptchaId(), request.getCaptchaCode());
     }
 
-    SysUser user;
-    if (request.getTenantCode() == null || request.getTenantCode().trim().isEmpty()) {
-        user = sysUserMapper.selectByUsernameIgnoreTenant(request.getUsername());
-    } else {
-        user = sysUserMapper.selectByUsernameAndTenantCode(request.getUsername(), request.getTenantCode().trim());
-    }
+    SysUser user = sysUserMapper.selectByUsernameIgnoreTenant(request.getUsername());
 
     if (user == null || user.getStatus() != 1 || !passwordEncoder.matches(request.getPassword(), user.getPasswordHash())) {
-      throw new IllegalArgumentException("用户名、密码或租户编码错误");
+      throw new IllegalArgumentException("用户名或密码错误");
     }
 
     String deviceCode = UUID.randomUUID().toString().replace("-", "");
@@ -227,23 +297,28 @@ public class AuthServiceImpl implements AuthService {
     return Boolean.parseBoolean(value);
   }
 
-  private TokenResponse issueTokens(SysUser user, String deviceCode, long accessMinutes, long refreshDays) {
+  private TokenResponse issueTokens(SysUser user, Long tenantId, String deviceCode, long accessMinutes, long refreshDays) {
     Map<String, Object> accessClaims = new HashMap<>();
     accessClaims.put("tokenType", "access");
     accessClaims.put("userId", user.getUserId());
-    accessClaims.put("tenantId", user.getTenantId());
+    accessClaims.put("tenantId", tenantId);
     accessClaims.put("username", user.getUsername());
     accessClaims.put("deviceCode", deviceCode);
 
     Map<String, Object> refreshClaims = new HashMap<>();
     refreshClaims.put("tokenType", "refresh");
     refreshClaims.put("userId", user.getUserId());
-    refreshClaims.put("tenantId", user.getTenantId());
+    refreshClaims.put("tenantId", tenantId);
     refreshClaims.put("deviceCode", deviceCode);
 
     String access = jwtTokenProvider.createToken(accessClaims, Duration.ofMinutes(accessMinutes).toMillis());
     String refresh = jwtTokenProvider.createToken(refreshClaims, Duration.ofDays(refreshDays).toMillis());
-    return new TokenResponse(access, refresh, accessMinutes, refreshDays);
+    return TokenResponse.builder()
+        .accessToken(access)
+        .refreshToken(refresh)
+        .accessExpiresInMinutes(accessMinutes)
+        .refreshExpiresInDays(refreshDays)
+        .build();
   }
 
   private void cacheRefreshToken(Long userId, String deviceCode, String refreshToken, long refreshDays) {

backend/src/main/java/com/imeeting/service/impl/SysOrgServiceImpl.java

@@ -13,6 +13,9 @@ public class SysOrgServiceImpl extends ServiceImpl<SysOrgMapper, SysOrg> impleme
     @Override
     public List<SysOrg> listTree(Long tenantId) {
         LambdaQueryWrapper<SysOrg> query = new LambdaQueryWrapper<>();
+        if (tenantId != null) {
+            query.eq(SysOrg::getTenantId, tenantId);
+        }
         query.orderByAsc(SysOrg::getSortOrder);
         return list(query);
     }

backend/src/main/java/com/imeeting/service/impl/SysPermissionServiceImpl.java

@@ -23,32 +23,25 @@ public class SysPermissionServiceImpl extends ServiceImpl<SysPermissionMapper, S
   }
 
   @Override
-  public List<SysPermission> listByUserId(Long userId) {
+  public List<SysPermission> listByUserId(Long userId, Long tenantId) {
     if (userId == null) {
       return List.of();
     }
 
-    // Get current login user from Security Context
-    org.springframework.security.core.Authentication auth = org.springframework.security.core.context.SecurityContextHolder.getContext().getAuthentication();
-    if (auth != null && auth.getPrincipal() instanceof com.imeeting.security.LoginUser) {
-      com.imeeting.security.LoginUser loginUser = (com.imeeting.security.LoginUser) auth.getPrincipal();
-      // If current user is Platform Admin (tenantId=0 & isPlatformAdmin=true), return all permissions
-      if (Boolean.TRUE.equals(loginUser.getIsPlatformAdmin()) && Long.valueOf(0).equals(loginUser.getTenantId())) {
-        return list();
-      }
-    }
-    
-    // Fallback or specific user logic (for tenant users or internal calls)
-    if (userId == 1L) {
+    SysUser user = sysUserService.getByIdIgnoreTenant(userId);
+    if (user != null && Boolean.TRUE.equals(user.getIsPlatformAdmin()) && Long.valueOf(0).equals(tenantId)) {
         return list();
     }
     
-    return baseMapper.selectByUserId(userId);
+    // 如果没有指定租户，或者租户为0但用户不是平台管理员，则返回空或按默认逻辑（通常需要指定租户）
+    if (tenantId == null) return List.of();
+    
+    return baseMapper.selectByUserId(userId, tenantId);
   }
 
   @Override
-  public Set<String> listPermissionCodesByUserId(Long userId) {
-    List<SysPermission> perms = listByUserId(userId);
+  public Set<String> listPermissionCodesByUserId(Long userId, Long tenantId) {
+    List<SysPermission> perms = listByUserId(userId, tenantId);
     return perms.stream()
         .map(SysPermission::getCode)
         .filter(code -> code != null && !code.isEmpty())

backend/src/main/java/com/imeeting/service/impl/SysUserServiceImpl.java

@@ -17,6 +17,16 @@ public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> impl
         return baseMapper.selectUsersByRoleId(roleId);
     }
 
+    @Override
+    public SysUser getByIdIgnoreTenant(Long userId) {
+        return baseMapper.selectByIdIgnoreTenant(userId);
+    }
+
+    @Override
+    public List<SysUser> listUsersByTenant(Long tenantId, Long orgId) {
+        return baseMapper.selectUsersByTenant(tenantId, orgId);
+    }
+
     @Override
     public boolean save(SysUser entity) {
         validateUniqueUsername(entity);
@@ -40,7 +50,7 @@ public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> impl
         }
         
         if (count(query) > 0) {
-            throw new IllegalArgumentException("该租户下已存在名为 [" + user.getUsername() + "] 的用户");
+            throw new IllegalArgumentException("用户名 [" + user.getUsername() + "] 已被占用");
         }
     }
 }

frontend/src/api/auth.ts

@@ -5,11 +5,18 @@ export interface CaptchaResponse {
   imageBase64: string;
 }
 
+export interface TenantInfo {
+  tenantId: number;
+  tenantCode: string;
+  tenantName: string;
+}
+
 export interface TokenResponse {
   accessToken: string;
   refreshToken: string;
   accessExpiresInMinutes: number;
   refreshExpiresInDays: number;
+  availableTenants?: TenantInfo[];
 }
 
 export interface LoginPayload {
@@ -48,3 +55,8 @@ export async function refreshToken(refreshToken: string) {
   const resp = await http.post("/auth/refresh", { refreshToken });
   return resp.data.data as TokenResponse;
 }
+
+export async function switchTenant(tenantId: number) {
+  const resp = await http.post(`/auth/switch-tenant?tenantId=${tenantId}`);
+  return resp.data.data as TokenResponse;
+}

frontend/src/api/http.ts

@@ -18,7 +18,10 @@ http.interceptors.response.use(
   (resp) => {
     const body = resp.data;
     if (body && body.code !== "0") {
-      return Promise.reject(new Error(body.msg || "请求失败"));
+      const err = new Error(body.msg || "请求失败");
+      (err as any).code = body.code;
+      (err as any).msg = body.msg;
+      return Promise.reject(err);
     }
     return resp;
   },
@@ -31,6 +34,16 @@ http.interceptors.response.use(
       // Force redirect to login with timeout flag
       window.location.href = "/login?timeout=1";
     }
+    
+    // Process backend error message if available in response body even for non-200 status
+    const body = error.response?.data;
+    if (body && body.msg) {
+        const err = new Error(body.msg);
+        (err as any).code = body.code;
+        (err as any).msg = body.msg;
+        return Promise.reject(err);
+    }
+
     return Promise.reject(error);
   }
 );

frontend/src/api/index.ts

@@ -22,6 +22,11 @@ export async function deleteUser(id: number) {
   return resp.data.data as boolean;
 }
 
+export async function getUserDetail(id: number) {
+  const resp = await http.get(`/api/users/${id}`);
+  return resp.data.data as SysUser;
+}
+
 export async function listRoles() {
   const resp = await http.get("/api/roles");
   return resp.data.data as SysRole[];

frontend/src/layouts/AppLayout.tsx

@@ -1,5 +1,5 @@
-import { Layout, Menu, Button, Space, Avatar, Dropdown, message, type MenuProps } from "antd";
-import { useEffect, useState } from "react";
+import { Layout, Menu, Button, Space, Avatar, Dropdown, message, type MenuProps, Select } from "antd";
+import { useEffect, useState, useMemo } from "react";
 import { Link, Outlet, useLocation, useNavigate } from "react-router-dom";
 import { useTranslation } from "react-i18next";
 import { 
@@ -14,11 +14,13 @@ import {
   MenuFoldOutlined,
   BellOutlined,
   SettingOutlined,
-  GlobalOutlined
+  GlobalOutlined,
+  ShopOutlined
 } from "@ant-design/icons";
 import { useAuth } from "../hooks/useAuth";
 import { usePermission } from "../hooks/usePermission";
-import { listMyPermissions } from "../api";
+import { listMyPermissions, getCurrentUser } from "../api";
+import { switchTenant, type TenantInfo } from "../api/auth";
 import { SysPermission } from "../types";
 
 const { Header, Sider, Content } = Layout;
@@ -36,13 +38,34 @@ export default function AppLayout() {
   const { t, i18n } = useTranslation();
   const [collapsed, setCollapsed] = useState(false);
   const [menus, setMenus] = useState<SysPermission[]>([]);
+  const [availableTenants, setAvailableTenants] = useState<TenantInfo[]>([]);
+  const [currentTenantId, setCurrentTenantId] = useState<number | null>(null);
+
   const location = useLocation();
   const navigate = useNavigate();
   const { logout } = useAuth();
   const { load: loadPermissions } = usePermission();
 
-  const fetchMenus = async () => {
+  const fetchInitialData = async () => {
     try {
+      // Load tenants from localStorage
+      const storedTenants = localStorage.getItem("availableTenants");
+      if (storedTenants) {
+        const tenants = JSON.parse(storedTenants) as TenantInfo[];
+        setAvailableTenants(tenants);
+      }
+
+      // Get current profile to know current tenant
+      const profileStr = sessionStorage.getItem("userProfile");
+      if (profileStr) {
+        const profile = JSON.parse(profileStr);
+        // We need to know which tenant is active. The token has it, 
+        // but for UI we can infer from profile if we update profile on switch.
+        // For now, let's assume we store activeTenantId in localStorage on login/switch
+        const activeId = localStorage.getItem("activeTenantId");
+        if (activeId) setCurrentTenantId(Number(activeId));
+      }
+
       const data = await listMyPermissions();
       // Load permissions into localStorage as well
       await loadPermissions();
@@ -58,9 +81,31 @@ export default function AppLayout() {
   };
 
   useEffect(() => {
-    fetchMenus();
+    fetchInitialData();
   }, []);
 
+  const handleSwitchTenant = async (tenantId: number) => {
+    try {
+      const data = await switchTenant(tenantId);
+      localStorage.setItem("accessToken", data.accessToken);
+      localStorage.setItem("refreshToken", data.refreshToken);
+      localStorage.setItem("activeTenantId", String(tenantId));
+      if (data.availableTenants) {
+        localStorage.setItem("availableTenants", JSON.stringify(data.availableTenants));
+      }
+      
+      // Refresh profile
+      const profile = await getCurrentUser();
+      sessionStorage.setItem("userProfile", JSON.stringify(profile));
+      
+      message.success(t('common.success'));
+      // Reload to refresh all states and permissions
+      window.location.reload();
+    } catch (e: any) {
+      message.error(e.message || t('common.error'));
+    }
+  };
+
   const handleLogout = () => {
     logout();
     navigate("/login");
@@ -179,6 +224,22 @@ export default function AppLayout() {
             onClick={() => setCollapsed(!collapsed)}
             style={{ fontSize: '16px', width: 64, height: 64 }}
           />
+          <div style={{ flex: 1, display: 'flex', alignItems: 'center', paddingLeft: 12 }}>
+            {availableTenants.length > 0 && (
+              <Select
+                value={currentTenantId}
+                onChange={handleSwitchTenant}
+                style={{ width: 200 }}
+                placeholder="切换租户"
+                variant="borderless"
+                suffixIcon={<ShopOutlined />}
+                options={availableTenants.map(t => ({
+                  label: t.tenantName,
+                  value: t.tenantId
+                }))}
+              />
+            )}
+          </div>
           <Space size={20}>
             <Dropdown menu={{ items: langMenuItems }} placement="bottomRight">
               <GlobalOutlined style={{ fontSize: '18px', color: '#666', cursor: 'pointer' }} />

frontend/src/pages/Login.tsx

@@ -66,6 +66,15 @@ export default function Login() {
       localStorage.setItem("accessToken", data.accessToken);
       localStorage.setItem("refreshToken", data.refreshToken);
       localStorage.setItem("username", values.username);
+      if (data.availableTenants) {
+        localStorage.setItem("availableTenants", JSON.stringify(data.availableTenants));
+        // We should infer activeTenantId from token or just use the first/default logic
+        // For simplicity, we can parse the JWT to get tenantId, or backend can return it.
+        // Let's assume for now we use the first one if not platform admin, or the backend logic.
+        // Actually, if we use a helper to parse JWT:
+        const payload = JSON.parse(atob(data.accessToken.split('.')[1]));
+        localStorage.setItem("activeTenantId", String(payload.tenantId));
+      }
       try {
         const profile = await getCurrentUser();
         sessionStorage.setItem("userProfile", JSON.stringify(profile));
@@ -125,18 +134,6 @@ export default function Login() {
             requiredMark={false}
             autoComplete="off"
           >
-            <Form.Item
-              name="tenantCode"
-              rules={[{ required: false }]}
-            >
-              <Input 
-                size="large" 
-                prefix={<ShopOutlined className="text-gray-400" aria-hidden="true" />}
-                placeholder={t('login.tenantCodePlaceholder')} 
-                aria-label={t('login.tenantCode')}
-              />
-            </Form.Item>
-
             <Form.Item
               name="username"
               rules={[{ required: true, message: t('login.username') }]}

frontend/src/pages/Orgs.tsx

@@ -65,6 +65,18 @@ export default function Orgs() {
   const [tenants, setTenants] = useState<SysTenant[]>([]);
   const [selectedTenantId, setSelectedTenantId] = useState<number | undefined>(undefined);
   
+  // Platform admin check
+  const isPlatformMode = useMemo(() => {
+    const profileStr = sessionStorage.getItem("userProfile");
+    if (profileStr) {
+      const profile = JSON.parse(profileStr);
+      return profile.isPlatformAdmin && localStorage.getItem("activeTenantId") === "0";
+    }
+    return false;
+  }, []);
+
+  const activeTenantId = useMemo(() => Number(localStorage.getItem("activeTenantId") || 0), []);
+
   const [drawerOpen, setDrawerOpen] = useState(false);
   const [editing, setEditing] = useState<SysOrg | null>(null);
   const [form] = Form.useForm();
@@ -74,7 +86,10 @@ export default function Orgs() {
       const resp = await listTenants({ current: 1, size: 100 });
       const list = resp.records || [];
       setTenants(list);
-      if (list.length > 0 && selectedTenantId === undefined) {
+      
+      if (!isPlatformMode) {
+        setSelectedTenantId(activeTenantId);
+      } else if (list.length > 0 && selectedTenantId === undefined) {
         setSelectedTenantId(list[0].id);
       }
     } catch (e) {
@@ -219,6 +234,7 @@ export default function Orgs() {
         )}
       </div>
 
+      {isPlatformMode && (
         <Card className="shadow-sm mb-4">
           <Space>
             <Text strong>{t('users.tenant')}：</Text>
@@ -233,6 +249,7 @@ export default function Orgs() {
             <Button icon={<ReloadOutlined aria-hidden="true" />} onClick={loadOrgs}>{t('common.refresh')}</Button>
           </Space>
         </Card>
+      )}
 
       <Card className="shadow-sm" styles={{ body: { padding: 0 } }}>
         {selectedTenantId !== undefined ? (
@@ -271,9 +288,19 @@ export default function Orgs() {
         }
       >
         <Form form={form} layout="vertical">
-          <Form.Item label={t('users.tenant')} name="tenantId" rules={[{ required: true }]}>
+          <Form.Item 
+            label={t('users.tenant')} 
+            name="tenantId" 
+            rules={[{ required: true }]}
+            hidden={!isPlatformMode}
+          >
             <Select disabled options={tenants.map(t => ({ label: t.tenantName, value: t.id }))} />
           </Form.Item>
+          {!isPlatformMode && (
+            <Form.Item label={t('users.tenant')}>
+              <Input value={tenants.find(t => t.id === activeTenantId)?.tenantName || "当前租户"} disabled />
+            </Form.Item>
+          )}
           
           <Form.Item label={t('orgs.parentOrg')} name="parentId">
             <Select 

frontend/src/pages/Permissions.tsx

@@ -102,7 +102,7 @@ export default function Permissions() {
 
   const parentOptions = useMemo(() => {
     return data
-      .filter((p) => p.permType === "menu" && (p.level === 1 || !p.parentId))
+      .filter((p) => p.permType === "menu")
       .map((p) => ({ value: p.permId, label: p.name }));
   }, [data]);
 
@@ -119,6 +119,20 @@ export default function Permissions() {
     setOpen(true);
   };
 
+  const openAddChild = (record: SysPermission) => {
+    setEditing(null);
+    form.resetFields();
+    form.setFieldsValue({ 
+      parentId: record.permId, 
+      level: Math.min((record.level || 1) + 1, 3),
+      permType: record.level === 1 ? "menu" : "button",
+      status: 1, 
+      isVisible: 1, 
+      sortOrder: 0 
+    });
+    setOpen(true);
+  };
+
   const submit = async () => {
     try {
       const values = await form.validateFields();
@@ -229,10 +243,20 @@ export default function Permissions() {
     },
     {
       title: t('common.action'),
-      width: 120,
+      width: 150,
       fixed: "right" as const,
       render: (_: any, record: SysPermission) => (
         <Space>
+          {can("sys_permission:create") && record.permType === 'menu' && (
+            <Tooltip title="添加子项">
+              <Button 
+                type="text" 
+                size="small" 
+                icon={<PlusOutlined aria-hidden="true" />} 
+                onClick={() => openAddChild(record)}
+              />
+            </Tooltip>
+          )}
           {can("sys_permission:update") && (
             <Button 
               type="text" 
@@ -363,6 +387,9 @@ export default function Permissions() {
             if (changed.level === 1) {
               form.setFieldsValue({ parentId: undefined });
             }
+            if (changed.level === 3) {
+              form.setFieldsValue({ permType: "button" });
+            }
           }}
         >
           <Row gutter={16}>
@@ -371,6 +398,7 @@ export default function Permissions() {
                 <Select aria-label={t('permissions.level')}>
                   <Select.Option value={1}>一级入口</Select.Option>
                   <Select.Option value={2}>二级子项</Select.Option>
+                  <Select.Option value={3}>三级按钮</Select.Option>
                 </Select>
               </Form.Item>
             </Col>
@@ -387,8 +415,8 @@ export default function Permissions() {
             dependencies={["level"]}
             rules={[
               ({ getFieldValue }) => ({
-                required: getFieldValue("level") === 2,
-                message: "二级子项必须选择父级菜单"
+                required: getFieldValue("level") > 1,
+                message: "非一级入口必须选择父级"
               })
             ]}
           >
@@ -397,7 +425,7 @@ export default function Permissions() {
               showSearch
               placeholder={level === 1 ? "一级入口无须父级" : "请选择父级菜单…"}
               options={parentOptions}
-              disabled={level !== 2}
+              disabled={level === 1}
               aria-label={t('permissions.parentId')}
             />
           </Form.Item>

frontend/src/pages/Roles.tsx

@@ -106,6 +106,18 @@ export default function Roles() {
   const [permissions, setPermissions] = useState<SysPermission[]>([]);
   const [selectedRole, setSelectedRole] = useState<SysRole | null>(null);
   
+  // Platform admin check
+  const isPlatformMode = useMemo(() => {
+    const profileStr = sessionStorage.getItem("userProfile");
+    if (profileStr) {
+      const profile = JSON.parse(profileStr);
+      return profile.isPlatformAdmin && localStorage.getItem("activeTenantId") === "0";
+    }
+    return false;
+  }, []);
+
+  const activeTenantId = useMemo(() => Number(localStorage.getItem("activeTenantId") || 0), []);
+
   // Right side states
   const [selectedPermIds, setSelectedPermIds] = useState<number[]>([]);
   const [halfCheckedIds, setHalfCheckedIds] = useState<number[]>([]);
@@ -120,14 +132,28 @@ export default function Roles() {
 
   // Search
   const [searchText, setSearchText] = useState("");
+  const [filterTenantId, setFilterTenantId] = useState<number | undefined>(undefined);
 
   // Drawer (Only for Add/Edit basic info)
   const [drawerOpen, setDrawerOpen] = useState(false);
   const [editing, setEditing] = useState<SysRole | null>(null);
+  const [tenants, setTenants] = useState<SysTenant[]>([]);
   const [form] = Form.useForm();
   
   const { can } = usePermission();
 
+  const loadTenants = async () => {
+    if (!isPlatformMode) return;
+    try {
+      const resp = await (await import("../api")).listTenants({ current: 1, size: 100 });
+      setTenants(resp.records || []);
+    } catch (e) {}
+  };
+
+  useEffect(() => {
+    loadTenants();
+  }, [isPlatformMode]);
+
   const permissionTreeData = useMemo(
     () => toTreeData(buildPermissionTree(permissions), t),
     [permissions, t]
@@ -193,7 +219,14 @@ export default function Roles() {
     setLoading(true);
     try {
       const list = await listRoles();
-      const roles = list || [];
+      let roles = list || [];
+      
+      if (isPlatformMode && filterTenantId !== undefined) {
+          roles = roles.filter(r => r.tenantId === filterTenantId);
+      } else if (!isPlatformMode) {
+          roles = roles.filter(r => r.tenantId === activeTenantId);
+      }
+
       setData(roles);
       if (roles.length > 0 && !selectedRole) {
         selectRole(roles[0]);
@@ -260,7 +293,10 @@ export default function Roles() {
   const openCreate = () => {
     setEditing(null);
     form.resetFields();
-    form.setFieldsValue({ status: 1 });
+    form.setFieldsValue({ 
+      status: 1,
+      tenantId: isPlatformMode ? undefined : activeTenantId
+    });
     setDrawerOpen(true);
   };
 
@@ -291,7 +327,8 @@ export default function Roles() {
         roleCode: editing?.roleCode || values.roleCode || generateRoleCode(),
         roleName: values.roleName,
         remark: values.remark,
-        status: values.status ?? DEFAULT_STATUS
+        status: values.status ?? DEFAULT_STATUS,
+        tenantId: values.tenantId
       };
       
       if (editing) {
@@ -344,7 +381,17 @@ export default function Roles() {
               </Button>
             )}
           >
-            <div className="mb-4">
+            <div className="mb-4 flex gap-2">
+              {isPlatformMode && (
+                <Select
+                  placeholder={t('users.tenantFilter')}
+                  style={{ width: 150 }}
+                  allowClear
+                  value={filterTenantId}
+                  onChange={setFilterTenantId}
+                  options={tenants.map(t => ({ label: t.tenantName, value: t.id }))}
+                />
+              )}
               <Input
                 placeholder={t('roles.searchPlaceholder')}
                 prefix={<SearchOutlined aria-hidden="true" />}
@@ -578,6 +625,22 @@ export default function Roles() {
         }
       >
         <Form form={form} layout="vertical">
+          <Form.Item 
+            label={t('users.tenant')} 
+            name="tenantId" 
+            rules={[{ required: true }]}
+            hidden={!isPlatformMode}
+          >
+            <Select 
+              options={tenants.map(t => ({ label: t.tenantName, value: t.id }))} 
+              disabled={!!editing}
+            />
+          </Form.Item>
+          {!isPlatformMode && (
+            <Form.Item label={t('users.tenant')}>
+              <Input value={tenants.find(t => t.id === activeTenantId)?.tenantName || "当前租户"} disabled />
+            </Form.Item>
+          )}
           <Form.Item label={t('roles.roleName')} name="roleName" rules={[{ required: true }]}>
             <Input placeholder={t('roles.roleName')} />
           </Form.Item>

frontend/src/pages/Users.tsx

@@ -38,7 +38,8 @@ import {
   UserOutlined,
   ShopOutlined,
   ApartmentOutlined,
-  ReloadOutlined
+  ReloadOutlined,
+  MinusCircleOutlined
 } from "@ant-design/icons";
 import type { SysRole, SysUser, SysTenant, SysOrg } from "../types";
 import "./Users.css";
@@ -65,6 +66,39 @@ function buildOrgTree(list: SysOrg[]): any[] {
   return roots;
 }
 
+const MembershipOrgSelect = ({ fieldProps, name, tenantId }: { fieldProps: any, name: number, tenantId?: number }) => {
+  const { t } = useTranslation();
+  const [orgs, setOrgs] = useState<any[]>([]);
+  const [loading, setLoading] = useState(false);
+
+  useEffect(() => {
+    if (tenantId) {
+      setLoading(true);
+      listOrgs(tenantId).then(data => {
+        setOrgs(buildOrgTree(data || []));
+      }).finally(() => setLoading(false));
+    } else {
+      setOrgs([]);
+    }
+  }, [tenantId]);
+
+  return (
+    <Form.Item
+      {...fieldProps}
+      label={t('users.orgNode')}
+      name={[name, 'orgId']}
+    >
+      <TreeSelect
+        placeholder="选择部门"
+        allowClear
+        treeData={orgs}
+        loading={loading}
+        disabled={!tenantId}
+      />
+    </Form.Item>
+  );
+};
+
 export default function Users() {
   const { t } = useTranslation();
   const { can } = usePermission();
@@ -75,6 +109,18 @@ export default function Users() {
   const [tenants, setTenants] = useState<SysTenant[]>([]);
   const [orgs, setOrgs] = useState<SysOrg[]>([]);
   
+  // Platform admin check
+  const isPlatformMode = useMemo(() => {
+    const profileStr = sessionStorage.getItem("userProfile");
+    if (profileStr) {
+      const profile = JSON.parse(profileStr);
+      return profile.isPlatformAdmin && localStorage.getItem("activeTenantId") === "0";
+    }
+    return false;
+  }, []);
+
+  const activeTenantId = useMemo(() => Number(localStorage.getItem("activeTenantId") || 0), []);
+
   // Search state
   const [searchText, setSearchText] = useState("");
   const [filterTenantId, setFilterTenantId] = useState<number | undefined>(undefined);
@@ -151,23 +197,31 @@ export default function Users() {
   const openCreate = () => {
     setEditing(null);
     form.resetFields();
-    form.setFieldsValue({ status: 1, roleIds: [], isPlatformAdmin: false });
+    form.setFieldsValue({ 
+      status: 1, 
+      roleIds: [], 
+      isPlatformAdmin: false,
+      tenantId: isPlatformMode ? undefined : activeTenantId,
+      memberships: isPlatformMode ? [] : [{ tenantId: activeTenantId }]
+    });
     setDrawerOpen(true);
   };
 
   const openEdit = async (record: SysUser) => {
     setEditing(record);
     try {
+      // Fetch full detail including memberships
+      const detail = await (await import("../api")).getUserDetail(record.userId);
       const roleIds = await listUserRoles(record.userId);
-      // Ensure orgs for the tenant are loaded
-      if (record.tenantId) {
-          const orgList = await listOrgs(record.tenantId);
-          setOrgs(orgList || []);
-      }
+      
       form.setFieldsValue({
-        ...record,
+        ...detail,
         roleIds: roleIds || [],
-        password: "" 
+        password: "",
+        // For compatibility with single tenant view if needed
+        tenantId: detail.tenantId || (detail.memberships?.[0]?.tenantId),
+        orgId: detail.orgId || (detail.memberships?.[0]?.orgId),
+        memberships: detail.memberships || []
       });
       setDrawerOpen(true);
     } catch (e) {
@@ -196,11 +250,15 @@ export default function Users() {
         email: values.email,
         phone: values.phone,
         status: values.status,
-        tenantId: values.tenantId,
-        orgId: values.orgId,
-        isPlatformAdmin: values.isPlatformAdmin
+        isPlatformAdmin: values.isPlatformAdmin,
+        memberships: values.memberships || []
       };
       
+      // If single tenant view, ensure current active tenant is included
+      if (!isPlatformMode && userPayload.memberships!.length === 0) {
+          userPayload.memberships = [{ tenantId: activeTenantId, orgId: values.orgId } as any];
+      }
+      
       if (values.password) {
         userPayload.passwordHash = values.password;
       }
@@ -251,20 +309,40 @@ export default function Users() {
     {
       title: t('users.org'),
       key: "org",
-      render: (_: any, record: SysUser) => (
+      render: (_: any, record: SysUser) => {
+        // Platform mode: show all tenants as tags
+        if (isPlatformMode && record.memberships && record.memberships.length > 0) {
+          return (
+            <div className="flex flex-col gap-1">
+              {record.memberships.slice(0, 3).map(m => (
+                <Tag key={m.tenantId} color="blue" style={{ margin: 0, padding: '0 4px', fontSize: 11 }}>
+                  {tenantMap[m.tenantId] || `租户${m.tenantId}`}
+                </Tag>
+              ))}
+              {record.memberships.length > 3 && <Text type="secondary" style={{ fontSize: 11 }}>等 {record.memberships.length} 个</Text>}
+            </div>
+          );
+        }
+        
+        // Single tenant mode or fallback: show specific tenant and org
+        const tid = record.tenantId || record.memberships?.[0]?.tenantId;
+        const oid = record.orgId || record.memberships?.[0]?.orgId;
+        
+        return (
           <div className="flex flex-col gap-1">
             <Space size={4} style={{ fontSize: 13 }}>
               <ShopOutlined style={{ color: '#8c8c8c' }} />
-            <span>{tenantMap[record.tenantId] || "未知租户"}</span>
+              <span>{tenantMap[tid || 0] || "未知租户"}</span>
             </Space>
-          {record.orgId && (
+            {oid && (
               <Space size={4} style={{ fontSize: 12, color: '#8c8c8c' }}>
                 <ApartmentOutlined />
-              <span>{orgs.find(o => o.id === record.orgId)?.orgName || "组织节点"}</span>
+                <span>关联组织已设置</span>
               </Space>
             )}
           </div>
-      )
+        );
+      }
     },
     {
       title: t('common.status'),
@@ -318,6 +396,7 @@ export default function Users() {
       <Card className="users-table-card shadow-sm">
         <div className="users-table-toolbar mb-4">
           <Space size="middle" wrap>
+            {isPlatformMode && (
               <Select
                 placeholder={t('users.tenantFilter')}
                 style={{ width: 200 }}
@@ -327,6 +406,7 @@ export default function Users() {
                 options={tenants.map(t => ({ label: t.tenantName, value: t.id }))}
                 suffixIcon={<ShopOutlined aria-hidden="true" />}
               />
+            )}
             <Input
               placeholder={t('users.searchPlaceholder')}
               prefix={<SearchOutlined aria-hidden="true" />}
@@ -375,29 +455,7 @@ export default function Users() {
         }
       >
         <Form form={form} layout="vertical" className="user-form">
-          <Row gutter={16}>
-            <Col span={12}>
-              <Form.Item label={t('users.tenant')} name="tenantId" rules={[{ required: true, message: t('users.tenant') }]}>
-                <Select 
-                  placeholder={t('users.tenant')} 
-                  showSearch
-                  optionFilterProp="label"
-                  options={tenants.map(t => ({ label: t.tenantName, value: t.id }))} 
-                />
-              </Form.Item>
-            </Col>
-            <Col span={12}>
-              <Form.Item label={t('users.orgNode')} name="orgId">
-                <TreeSelect
-                  placeholder={t('users.orgNode')}
-                  allowClear
-                  treeData={orgTreeData}
-                  disabled={!selectedTenantId}
-                />
-              </Form.Item>
-            </Col>
-          </Row>
-
+          <Title level={5} style={{ marginBottom: 16 }}>基本信息</Title>
           <Row gutter={16}>
             <Col span={12}>
               <Form.Item label={t('users.username')} name="username" rules={[{ required: true, message: t('users.username') }]}>
@@ -452,6 +510,56 @@ export default function Users() {
               </Form.Item>
             </Col>
           </Row>
+
+          <Title level={5} style={{ marginTop: 24, marginBottom: 16 }}>租户成员身份</Title>
+          
+          <Form.List name="memberships">
+            {(fields, { add, remove }) => (
+              <>
+                {fields.map(({ key, name, ...restField }) => (
+                  <Card 
+                    key={key} 
+                    size="small" 
+                    className="mb-3" 
+                    styles={{ body: { padding: '12px' } }}
+                    title={isPlatformMode ? `身份 #${name + 1}` : undefined}
+                    extra={isPlatformMode && fields.length > 1 && (
+                      <Button type="text" danger icon={<MinusCircleOutlined />} onClick={() => remove(name)} />
+                    )}
+                  >
+                    <Row gutter={12}>
+                      <Col span={12}>
+                        <Form.Item
+                          {...restField}
+                          label={t('users.tenant')}
+                          name={[name, 'tenantId']}
+                          rules={[{ required: true, message: '必填' }]}
+                        >
+                          <Select 
+                            options={tenants.map(t => ({ label: t.tenantName, value: t.id }))} 
+                            disabled={!isPlatformMode}
+                            placeholder="选择租户"
+                          />
+                        </Form.Item>
+                      </Col>
+                      <Col span={12}>
+                        <MembershipOrgSelect 
+                          fieldProps={{...restField}} 
+                          name={name} 
+                          tenantId={form.getFieldValue(['memberships', name, 'tenantId'])} 
+                        />
+                      </Col>
+                    </Row>
+                  </Card>
+                ))}
+                {isPlatformMode && (
+                  <Button type="dashed" onClick={() => add()} block icon={<PlusOutlined />}>
+                    分配到新租户
+                  </Button>
+                )}
+              </>
+            )}
+          </Form.List>
         </Form>
       </Drawer>
     </div>