Injection system according to the type of bean selection (windows, linux injecting different properties)

1: The need to inject a bean

/ ** 
 * selective implantation bean. . The window, linux system injects a different value 
 * / 
@Configuration 
public  class Cap5Config { 

    / * 
        Linux system injects attribute 
     * / 
    @Bean ( "linuxuser" ) 
    @Conditional (LinuxCondition. Class )
     public the User linuxuser () {
         return  new new the User ( "linuxuser", 26 is ); 
    } 

    / * 
        the Window injection system attribute 
     * / 
    @Bean ( "windowUser" ) 
    @Conditional (value . WindowCondition = class )      // selective implantation (@Bean annotation requires complex) 
    public User windowUser() {
        return new User("windowUser", 26);
    }

2: Setting the registration conditions

/ ** 
 * Registered targeted bean: Analyzing conditions used in the context 
 * / 
public  class WindowCondition the implements for condition Condition { 

    @Override 
    public  Boolean The matches (ConditionContext context, AnnotatedTypeMetadata Metadata) { 

        Environment Environment = Context.getEnvironment (); 
        String window = Environment. getProperty ( "The os.name" );
         IF (window.contains ( "Win")) return  to true ;
         return  to false ; 

    } 
}

3: labeling conditions

@Conditional(value = WindowCondition.class)

4: Test

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);
        }
    }
}