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