有点类似java 内部类。看个demo。假设有下面的一个bean：
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public
class
Customer
{
private
Person person;
public
Customer(Person person) {
this
.person = person;
}
public
void
setPerson(Person person) {
this
.person = person;
}
@Override
public
String toString() {
return
"Customer [person="
+ person +
"]"
;
}
}
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public
class
Person
{
private
String name;
private
String address;
private
int
age;
//getter and setter methods
@Override
public
String toString() {
return
"Person [address="
+ address + ",
age=
" + age + "
, name=
" + name + "
]";
}
}
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
<
bean
id="CustomerBean" class="com.mkyong.common.Customer">
<
property
name="person" ref="PersonBean" />
</
bean
>
<
bean
id="PersonBean" class="com.mkyong.common.Person">
<
property
name="name" value="mkyong" />
<
property
name="address" value="address1" />
<
property
name="age" value="28" />
</
bean
>
</
beans
>
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
<
bean
id="CustomerBean" class="com.mkyong.common.Customer">
<
property
name="person">
<
bean
class="com.mkyong.common.Person">
<
property
name="name" value="mkyong" />
<
property
name="address" value="address1" />
<
property
name="age" value="28" />
</
bean
>
</
property
>
</
bean
>
</
beans
>
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我们也可以使用构造函数注入
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
<
bean
id="CustomerBean" class="com.mkyong.common.Customer">
<
constructor-arg
>
<
bean
class="com.mkyong.common.Person">
<
property
name="name" value="mkyong" />
<
property
name="address" value="address1" />
<
property
name="age" value="28" />
</
bean
>
</
constructor-arg
>
</
bean
>
</
beans
>
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Note
注意，在inner bean中，id和name不是必须的，因为他们会被容器忽略。
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import
org.springframework.context.ApplicationContext;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
public
class
App
{
public
static
void
main( String[] args )
{
ApplicationContext context =
new
ClassPathXmlApplicationContext(
new
String[] {
"Spring-Customer.xml"
});
Customer cust = (Customer)context.getBean(
"CustomerBean"
);
System.out.println(cust);
}
}
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