可以在以下复杂的RBAC要求中使用Keycloak授权吗？还是应该通过构建业务逻辑的数据库表和关系来解决？

Keycloak可以支持复杂的RBAC需求，包括基于角色和基于权限的访问控制。可以使用Keycloak提供的细粒度访问控制模型，包括角色、资源、策略和权限来实现。

例如，以下是使用Keycloak的Java客户端实现细粒度的授权和访问控制的示例代码：

import org.keycloak.KeycloakPrincipal;
import org.keycloak.adapters.springsecurity.token.KeycloakAuthenticationToken;
import org.keycloak.authorization.client.util.Http;
import org.keycloak.authorization.client.token.TokenManager;

@RestController
@RequestMapping("/api")
public class MyController {

    @GetMapping("/users")
    public List<User> getUsers(KeycloakAuthenticationToken authentication) {
        TokenManager tokenManager = TokenManager.create(Http.createDefault());
        KeycloakPrincipal principal = (KeycloakPrincipal) authentication.getPrincipal();
        AccessToken accessToken = principal.getKeycloakSecurityContext().getToken();
        String entitlementsToken = tokenManager.entitlements().get(accessToken.getSubject()).getToken();
        List<User> users = userRepository.findAll();
        return users.stream()
                .filter(user -> canAccess(authentication, entitlementsToken, "view", "users", user.getId()))
                .collect(Collectors.toList());
    }

    @PostMapping("/users")
    public User createUser(@RequestBody User user, KeycloakAuthenticationToken authentication) {
        TokenManager tokenManager = TokenManager.create(Http.createDefault());
        KeycloakPrincipal principal = (KeycloakPrincipal) authentication.getPrincipal();
        AccessToken accessToken = principal.getKeycloakSecurityContext().getToken();
        String entitlementsToken = tokenManager.entitlements().get(accessToken.getSubject()).getToken();
        if (canAccess(authentication, entitlementsToken, "create", "users", null)) {
            userRepository.save(user);
            return user;
        } else {
            throw new AccessDeniedException("User not authorized");
        }
    }

    @PutMapping("/users/{id}")
    public User updateUser(@PathVariable Long id, @RequestBody User user, KeycloakAuthenticationToken authentication) {
        TokenManager tokenManager = TokenManager.create(Http.createDefault());
        KeycloakPrincipal principal = (KeycloakPrincipal) authentication.getPrincipal();
        AccessToken accessToken = principal.getKeycloakSecurityContext().getToken();
        String entitlementsToken = tokenManager.entitlements().get(accessToken.getSubject()).getToken();
        if (canAccess(authentication, entitlementsToken, "update", "users", id)) {
            user.setId(id);
            return userRepository.save(user);
        } else {
            throw new AccessDeniedException("