这一章节我们来讨论一下注解装配的@autowired是怎样通过属性域注入？
1.domain
蛋糕类：（不变）
package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_6;public class Cake {private String name = "";public String getName() {return name;}public void setName(String name) {this.name = name;}}
厨师类：
package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_6;import org.springframework.beans.factory.annotation.Autowired;public class Chief {@Autowiredprivate Cake cake = null;private String name = "";public String getName() {return name;}public Cake makeOneCake() {System.out.println(getName() + " make " + cake.getName());return cake;}public void setName(String name) {this.name = name;}}
这里需要注意的是，虽然我们的cake属性域是赋值为null，但是当spring容器启动时，通过@Autowired标签注入cake对象
2.测试类：
package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_6;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_6/ApplicationContext-test.xml" })
public class ChiefTest {@Autowiredprivate ApplicationContext applicationContext;@Testpublic void testChief() {Chief jack = applicationContext.getBean(Chief.class);jack.makeOneCake();}
}
3.配置文件：（重点）
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"><bean id="blueberryCheeseCake"class="com.raylee.my_new_spring.my_new_spring.ch02.topic_1_6.Cake"p:name="blueberryCheeseCake" scope="prototype" /><bean id="jack"class="com.raylee.my_new_spring.my_new_spring.ch02.topic_1_6.Chief"p:name="jack" />
</beans>
虽然我们上面这里定义了两个bean，但是jack那个bean不再需要通过<property/>标签来注入blueberryCheeseCake这个bean，而是通过Chief里面的@Autowired标签来完成注入。
测试输出：
jack make blueberryCheeseCake
总结：这一章节主要介绍@autowired是怎样通过属性域注入。
目录：http://blog.csdn.net/raylee2007/article/details/50611627
我的github：https://github.com/raylee2015/my_new_spring