Spring In Action-2.1-02-@Component注解给Bean命名

Posted 2020-10-05 第二天半

package soundsystem;

import org.springframework.stereotype.Component;

//@Component注解会告诉Spring创建这个类的实例bean（注意，启动Component注解功能需要在xml里面配置）
@Component("newName")
public class SgtPeppers implements CompactDisc {

    private String title="Pepper‘s Lonely";
    private String artist="The beatles";
    
    SgtPeppers(){
        System.out.println("SgtPeppers类实例化");
    }
    
    public void play() {
        System.out.println("Sgt Playing:title="+title+" artist="+artist);
    }

}

package soundsystem;

import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringTest2 {

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
    }

    @Test 
    public void instanceSpring(){
        //将配置传过去，实例化容器
        ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");
        SgtPeppers sp = (SgtPeppers)ctx.getBean("newName");
        sp.play();
    }
}

 

@Component("newName")//给Bean实例重新命名为：newName 

@Component//Bean实例默认命名：类名首字母小写