Spring自定義@Qualifier

Spring可以自定義@Qualifier

參考鏈接 http://yangchengwanhong.blog.sohu.com/234465733.html

例子代碼如下：

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.inject.Qualifier;

@Target({ElementType.FIELD,ElementType.PARAMETER,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface StringedInstrument {

}

使用的時候在需要被註解的類上面加上，即可

@StringedInstrument
public class Guitar extends Instrument {

}

public class Instrument {
	private String name;
	private String sound;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSound() {
		return sound;
	}

	public void setSound(String sound) {
		this.sound = sound;
	}

}