在Spring中自动连线特定的内部bean

Question

I have an interface called HttpClient , and two beans implementation of the bean,

 public interface HttpClient {
    String bla();
}

@Component
public class HttpClientImpl implements HttpClient {
    @Override
    public String bla() {
        return null;
    }
}

@Component
public class HttpClientMock implements HttpClient {
    @Override
    public String bla() {
        return null;
    }
}

And now I have a wrapper for this bean that injects the HttpClient

@Component
public class Wrapper {
    @Autowired HttpClient httpClient;
}

Is there any way to choose when I inject the Wrapper

@Autowired Wrapper wrapper;

to choose the specific implementation for the HttpClient , I mean if I want to inject the HttpClientMock ?

Answer 1

@Component("httpClient")
public class HttpClientImpl implements HttpClient {
    @Override
    public String bla() {
        return null;
    }
}

@Component("httpClientMock")
public class HttpClientMock implements HttpClient {
    @Override
    public String bla() {
        return null;
    }
}

@Component
public class Wrapper {
    @Autowired
    @Qualifier("httpClient")
    HttpClient httpClient;

    @Autowired
    @Qualifier("httpClientMock")
    HttpClient httpClientMock;
}

Here it seems you need your httpClient for testing, In that case i wouldnt say to do above way, rather create profiles as given below (you can have different profile for other ones) and when you run your spring application , run it in test profile. Find more information about spring profiles here

@Component("httpClientMock")
@Profile("test")
public class HttpClientMock implements HttpClient {
    @Override
    public String bla() {
        return null;
    }
}