java - 如何在非Spring的构造型类中使用@Autowired

Question

我想在此类中使用该存储库，但是当我放置 @Component 之类的构造型时，我从 IDE 收到错误:

Could not autowire. No beans of 'Authentication' type found.

public class CustomMethodSecurityExpressionRoot extends SecurityExpressionRoot implements MethodSecurityExpressionOperations {

    @Autowired
    private FlatRepository flatRepository;

    public CustomMethodSecurityExpressionRoot(Authentication authentication) {
        super(authentication);
     }
}

Answer 1

您不能在 SecurityExpressionRoot 内使用 @Autowire。
不过，您可以手动提供 FlatRepository 依赖项。

当您在 @Configuration 类中配置 Security 对象时，您可以 @Autowire 任何您需要的实例。

只需在 CustomMethodSecurityExpressionRoot 构造函数中为新依赖项腾出空间

class CustomMethodSecurityExpressionRoot extends SecurityExpressionRoot 
                                         implements MethodSecurityExpressionOperations {
    private final FlatRepository flatRepository;

    CustomMethodSecurityExpressionRoot(
            final Authentication authentication,
            final FlatRepository flatRepository) {
        super(authentication);
        this.flatRepository = flatRepository;
    }

    ...
}

并在实例化点手动注入(inject)

final SecurityExpressionRoot root = new CustomMethodSecurityExpressionRoot(authentication, flatRepository);