/**
 * 选择性注入bean。。根据window,linux系统注入不同的值
 */
@Configuration
public class Cap5Config {

    /*
        linux系统注入的属性
     */
    @Bean("linuxUser")
    @Conditional(LinuxCondition.class)
    public User linuxUser() {
        return new User("linuxUser", 26);
    }

    /*
        Window系统注入的属性
     */
    @Bean("windowUser")
    @Conditional(value = WindowCondition.class)     //选择性注入(需要配合@Bean注解)
    public User windowUser() {
        return new User("windowUser", 26);
    }

/**
 * 针对性注册bean:判断条件使用的上下文环境
 */
public class WindowCondition implements Condition {

    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {

        Environment environment = context.getEnvironment();
        String window = environment.getProperty("os.name");
        if (window.contains("Win")) return true;
        return false;

    }
}

@Conditional(value = WindowCondition.class)

public class ConditionApplication {
    public static void main(String[] args) {

        AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(Cap5Config.class);

        String[] beanDefinitionNames = annotationConfigApplicationContext.getBeanDefinitionNames();
        for (String beanName : beanDefinitionNames) {　　//获取注入的所有的bean并打印
            System.out.println(beanName);
        }
    }
}