What is IOC Profile?

Spring profile is manage bean group.

Can see current active profile using getEnvironment method in ApplicationContext.

  • How define profile.
    • Define in class
      • @Configuration @Profile(“test”)
      • @Component @Profile(“test”)
    • Define in method
      • @Bean @Profile(“test”)

First of all, make interface. 

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public interface ProRepository {

    public String printState();
}

Also make TestProRepository.

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@Repository
public class TestProRepository implements ProRepository {

    @Override
    public String printState() {
        return "Test!!!";
    }
}

And can use with Configuration class like below.

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@Configuration
@Profile("test")
public class TestConfiguration {
    @Bean
    public ProRepository proRepository(){
        return new TestProRepository();
    }
}

Next, should write configuration in VM setting.

base

Let’s Execute code.

Once get Environment from ApplicationContext, use getActiveProfiles which has current active profile and getDefaultProfiles which just default.

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@Component
public class ProRunner implements ApplicationRunner {

    @Autowired
    ProRepository proRepository;

    @Autowired
    ApplicationContext ctx;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        Environment environment = ctx.getEnvironment();
        System.out.println(Arrays.toString(environment.getActiveProfiles()));
        System.out.println(Arrays.toString(environment.getDefaultProfiles()));

        System.out.println(proRepository.printState());
    }
}

Result like below.

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[test]
[default]
Test!!!

But don’t have to create configuration class, there is more convenient way.

Just write ‘@Profile(“test”)’ in class.

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@Repository
@Profile("test")
public class TestProRepository implements ProRepository {

    @Override
    public String printState() {
        return "Test!!!";
    }
}

And create another class for how to use profile.

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@Repository
@Profile("!test")
public class TTProRepositrory implements ProRepository {

    @Override
    public String printState() {
        return "Not test!";
    }
}

As like above code, can write ‘@Profile(“!test”)’, it means that can write some operator in Profile annotation.

  • Profile Operator
    • ! (not)
    • & (and)
    • | (or)

Current configuration is like ‘-Dspring.profiles.active=”test” ‘, so the expected result like below.

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[test]
[default]
Test!!!

If change VM configure ‘’-Dspring.profiles.active=”test222” ‘ ‘,so the expected result like below.

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[test22]
[default]
Not test!