摘要：屬性參考至對象。一個對象的屬性參考另一個對象的實例，如，學生（StudentBean）對象有兩個屬性一個是name一個是addressBean，name是一個String型，而addressBean是AddressBean對象（地址對象）的一個實例。
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StrudentBean.java
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package com.kela.spring.ioc;
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public class StudentBean {
???
??? private String name;
??? private AddressBean addressBean;
???
??? public AddressBean getAddressBean() {
??????? return addressBean;
??? }
??? public void setAddressBean(AddressBean addressBean) {
??????? this.addressBean = addressBean;
??? }
??? public String getName() {
??????? return name;
??? }
??? public void setName(String name) {
??????? this.name = name;
??? }
}
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AddressBean.java
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package com.kela.spring.ioc;
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public class AddressBean {
???
??? private String addressName;
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??? public String getAddressName() {
??????? return addressName;
??? }
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??? public void setAddressName(String addressName) {
??????? this.addressName = addressName;
??? }
}
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beans-config_2.xml
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<?xml
version=
"1.0"
encoding=
"GB2312"
?>
<!DOCTYPE
beans
PUBLIC
"-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd"
>
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<beans>
???
<bean
id=
"addressBean"
class=
"com.kela.spring.ioc.AddressBean"
>
??????
<property
name=
"addressName"
>
??????????
<value>
團結大街向陽路
123
號
</value>
??????
</property>
???
</bean>
???
???
<bean
id=
"studentBean"
class=
"com.kela.spring.ioc.StudentBean"
>
??????
<property
name=
"name"
>
??????????
<value>
KangFeng
</value>
??????
</property>
??????
<property
name=
"addressBean"
>
??????????
<!--
注意這里已不是
value
了，改為
ref
-->
??????????
<ref
bean=
"addressBean"
></ref>
??????
</property>
???
</bean>
</beans>
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TestClass.java
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import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
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public class TestClass {
???
??? public void method_2() {
??????? try {
??????????? ApplicationContext context = new FileSystemXmlApplicationContext("bin\\com\\kela\\spring\\ioc\\beans-config_2.xml");
??????????? StudentBean studentBean = (StudentBean)context.getBean("studentBean");
??????????? System.out.println("
姓名：" + studentBean.getName() + ";地址：" + studentBean.getAddressBean().getAddressName());
??????? } catch (Exception e) {
??????????? System.out.println("[ERROR]" + e.getMessage());
??????? }
??? }
???
??? public static void main(String[] args) {
??????? TestClass testClass = new TestClass();
??????? testClass.method_2();
??? }
}
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學習小結
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“Don’t Call Me，I‘ll Call You”。
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