这一章节我们来讨论一下内部类注入Bean。
1.domain
蛋糕类：（跟前一章节的一样）
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9;
public class Cake {
private final int id = index++;
private static int index = 0;
private String name = "";
private double size = 0;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getSize() {
return size;
}
public void setSize(double size) {
this.size = size;
}
public int getId() {
return id;
}
@Override
public String toString() {
return "create the cake,its id:" + id + ", size:" + size + " inch ,name:" + name;
}
}
厨师类：（基本没有变化）
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9;
public class Chief {
private Cake cake = null;
public Cake getCake() {
return cake;
}
private String name = "";
public Chief(String name) {
this.name = name;
}
public Chief(String name, Cake cake) {
this.name = name;
this.cake = cake;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void setCake(Cake cake) {
this.cake = cake;
}
private final int id = index++;
public int getId() {
return id;
}
private static int index = 0;
public Cake makeOneCake() {
return cake;
}
}
測试类：
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9;
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/ch01/topic_1_9/ApplicationContext-test.xml" })
public class ChiefTest {
@Autowired
private ApplicationContext applicationContext;
@Test
public void testChief() {
Chief chief = applicationContext.getBean(Chief.class);
System.out.println("chief name:" + chief.getName());
System.out.println(chief.getName() + " make a cake ,cake's name :" + chief.makeOneCake());
}
}
2.配置文件
以下是通过属性注入内部类的配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
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"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<bean id="chief"
class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Chief">
<constructor-arg value="jack" />
<property name="cake">
<bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Cake">
<property name="name" value="jack's own cake" />
<property name="size" value="9" />
</bean>
</property>
</bean>
</beans>
注意：我们内部类注入，配置文件中面的cake是不带id的，并且。他不能为其它的Bean所公用。
以下是通过构造器注入内部类的配置文件：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 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" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean id="chief" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Chief"> <constructor-arg value="jack" /> <constructor-arg> <bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Cake"> <property name="name" value="jack's own cake" /> <property name="size" value="9" /> </bean> </constructor-arg> </bean> </beans>
大家须要注意的是。我们上面的配置文件配置Bean的时候配置了两个属性，因此我们的构造器里面，必须存在这两个属性值，不然就会抛异常。
总结：这一章节主要介绍内部类注入Bean的形式和注意点。
文件夹：http://blog.csdn.net/raylee2007/article/details/50611627
我的github：https://github.com/raylee2015/my_new_spring