Question

可能是它的副本，请随意标记...我是Spring的新手。

我正在实施UserService以获取来自不同供应商的用户详细信息，所以我的班级结构是

界面UserService - ＆gt;＆gt; UserServiceA，UserServiceB

使用哪种用户服务取决于名为provider的字段。我的代码看起来像

public interface ExternalUserService {
    ExternalUserDTO getUserDetail(String username);
}

实施 -

public class GoogleUserService implements ExternalUserService{
    @Override
    public ExternalUserDTO getUserDetail(String username) {
        return user;
    }
}

public class FacebookUserService implements ExternalUserService{
    @Override
    public ExternalUserDTO getUserDetail(String username) {
        return user;
    }
}

我想以这种方式在我的代码中使用它，我不知道这是否可行，但试着看看它是否可能

public class ExternalUserManager(String provider) {
    String provider;
    @Autowired
    ExternalUserService service; //This is supposed to come from some factory, dont know how to get it in spring context.

    public void doSomething(String username) {
        System.out.println(service.getUserDetail(username));
    }
}


Had it been in conventional java programming, I would have created a Factory called UserServiceFactory, which would have made the things straight. 

Can someone please help me on how much it is possible with spring, and if its possible, then how can I achieve it? We use Spring boot, so no xml config.

Answer 1

您可以使用@Bean带注释的方法和范围＆＃39;原型＆＃39;作为一个工厂。只要将bean注入某个地方，Spring就会调用此方法。

import org.springframework.beans.factory.config.BeanDefinition;
...
@Bean
@Scope(BeanDefinition.SCOPE_PROTOTYPE)
public ExternalUserService externalUserService(UserServiceFactory factory,UserProviderResolver resolver) {
    .. create the user service depending on resolver.getProvider()
}

UserServiceFactory用于创建特定服务，具体取决于提供者名称，如您所述。

使用方法getProvider（）创建一个类UserProviderResolver，该方法返回当前请求或用户的提供者名称。

您可以在UserProviderResolver中@Autowire HttpRequest来访问当前请求。

工厂的春天替代品

1 个答案: