spring boot条件注解@Conditional

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public class WindowsCondition implements Condition {
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        return context.getEnvironment().getProperty("os.name").contains("Windows");
    }
}

public class LinuxCondition implements Condition {
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        return context.getEnvironment().getProperty("os.name").contains("Linux");
    }
}

public interface ListService {
    public String showListCmd();
}

public class WindowsListService implements ListService {
    @Override
    public String showListCmd() {
        return "dir";
    }
}


public class LinuxListService implements ListService {
    @Override
    public String showListCmd() {
        return "ls";
    }
}

@Configuration
public class ConditionConfig {
    @Bean
    @Conditional(WindowsCondition.class)
    public ListService windowsListService() {
        return new WindowsListService();
    }

    @Bean
    @Conditional(LinuxCondition.class)
    public ListService linuxListService() {
        return new LinuxListService();
    }
}

public class Main {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ConditionConfig.class);

        ListService listService = context.getBean(ListService.class);

        System.out.println(context.getEnvironment().getProperty("os.name")
            + "系统下的列表命令为: "
            + listService.showListCmd());
    }
}