这一章节我们来讨论一下自己主动检測Bean。

1.domain

厨师类：

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_19;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Componentpublic class Chief {	@Value("jack")	private String name = "";	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}}

除了上面的默认配置。我们还能够自己加上bean的id

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_19;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Component("jack")public class Chief {	@Value("jack")	private String name = "";	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}}

厨师类这里我们使用@Component来标注这个Bean，默认id是chief

事实上还有其它标签能够作为bean的标注

@Component-作为构件来配置bean

@Repository-标识数据仓库

@Service-标识服务

@Controller-标识MVC的控制器

可是上面的几个标签的作用大同小异，都是标注有这么一个bean

2.測试类：

（1）以下是通过.class来提取bean

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_19;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = {		"/com/raylee/my_new_spring/my_new_spring/ch02/topic_1_19/ApplicationContext-test.xml" })public class ChiefTest {	@Autowired	private ApplicationContext applicationContext;	@Test	public void testChief() {		Chief jack = (Chief) applicationContext.getBean(Chief.class);		System.out.println(jack.getName());	}}

（2）因为上面的bean没有标注id，因此，它的默认id是chief，我们也能够通过id来提取

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_19;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = {		"/com/raylee/my_new_spring/my_new_spring/ch02/topic_1_19/ApplicationContext-test.xml" })public class ChiefTest {	@Autowired	private ApplicationContext applicationContext;	@Test	public void testChief() {		Chief jack = (Chief) applicationContext.getBean("chief");		System.out.println(jack.getName());	}}

3.配置文件（最简单）

測试输出：

jack

总结：这一章节我们主要介绍自己主动检測Bean。

文件夹： 

 

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