@Configuration
@ComponentScan
public class CDPlayerConfig {
}
將@ComponentScan移除
代碼就會報錯 因爲這樣就不會去自動掃描包中的Bean
要在JavaConfig中聲明bean,我們需要編寫一個方法,這個方法會創建所需類型的實例,然
後給這個方法添加@Bean註解。比方說,下面的代碼聲明瞭CompactDisc bean:
package soundsystem;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
public class CDPlayerConfig {
@Bean
public CDplayer cdplayer( ){
return new CDplayer( );
}
@Bean
public CDMusic cdMusic(){
return new CDMusic();
}
}