使用 SpringBoot 配置文件模拟 REST API 调用

Question

I have recently started out with Spring and am unsure about how to approach this issue. I have a Spring boot program which makes calls to remote REST APIs. For example an AddressService class with getAddress(String user) method, which makes a HTTP call and returns a JSON response. I would like to set up Spring profiles for development purposes local , dev , uat , prod .

When the program is running with the local profile, I would like to "mock" these external API calls with an expected JSON response, so I can just test logic, but when it is run in any of the other profiles I would like to make the actual calls. How can I go about doing this? From what I read, there's many ways people approach this, using WireMock , RestTemplate , Mockito etc. I'm confused about which is the way to go.

Any advice would be greatly appreciated. Thanks.

Answer 1

WireMock,Mockit is for unittest, to mock the real request. Example here: How do I mock a REST template exchange?

When you need a running implementation with a mock, i think the easiest way is that you have a interface

public interface AdressAdapter {
    public List<Adress> getAddress(String name);
}

And two different implementations depending on the profile.

@Profile("local")
public class DummyAdress implements AdressAdapter{
    @Override
    public List<Adress> getAddress(String name) {
        //Mock here something
        return null;
    }
}

! means NOT locale profile in this case.

@Profile("!local")
public class RealAdress implements AdressAdapter{
    @Override
    public List<Adress> getAddress(String name) {
        //Make Restcall
        return null;
    }
}

Answer 2

What you could do is use different application.properties files depending on your profile. That way, you just change the url to a mock server for your local profile.

So what you have to do is :

1. Create another application.properties in your resources folder named : application-local.properties .
2. Change the url of the desired service.
3. Start your application with the VM option -Dspring.profiles.active=local .

Here is a link that describe well what you want to achieve.

For your mock server, you could use Wiremock , Mountebank , Postman ,... that can be start separately and mock specific endpoints to return what you want.