Demo.java
@Test
public void fun3() {
//1 创建容器对象
ApplicationContext ac=new ClassPathXmlApplicationContext("cn/itcast/c_injection/applicationContext.xml");
//2 向容器“要” user对象
CollectionBean cb=(CollectionBean)ac.getBean("cb");
//3 打印user对象
System.out.println(cb);
}
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">
<!-- set方式注入: -->
<bean name="user" class="cn.itcast.bean.User">
<!-- 为user对象中名为name的属性注入tom作为值 -->
<property name="name" value="tom"></property>
<property name="age" value="18"></property>
<!-- 为car属性注入下方配置的car对象 -->
<property name="car" ref="car"></property>
</bean>
<!-- 将car对象配置到容器中 -->
<bean name="car" class="cn.itcast.bean.Car">
<property name="name" value="兰博基尼"></property>
<property name="color" value="红色"></property>
</bean>
<!-- ======================================== -->
<!-- 构造函数注入
<bean name="user2" class="cn.itcast.bean.User">
index="1" type="cn.itcast.bean.Car"
<constructor-arg name="name" value="jerry" ></constructor-arg>
<constructor-arg name="car" ref="car"></constructor-arg>
</bean> -->
<!-- ======================================== -->
<!-- 复杂类型注入 -->
<!-- array注入 -->
<bean name="cb" class="cn.itcast.c_injection.CollectionBean">
<!-- 如果数组中只准备注入一个值 -->
<!-- <property name="arr" value="tom"></property> -->
<!-- 注入多个值 -->
<property name="arr">
<array>
<value>tom</value>
<value>jerry</value>
<ref bean="user"/>
</array>
</property>
</bean>
</beans>
CollectionBean.java
package cn.itcast.c_injection;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;
public class CollectionBean {
@Override
public String toString() {
return "CollectionBean [arr=" + Arrays.toString(arr) + ", list=" + list + ", map=" + map + ", prpo=" + prpo
+ "]";
}
private Object[] arr;//数组类型注入
private List list;//list/set类型注入
private Map map;//map类型注入
private Properties prpo;//Properties类型注入
public Object[] getArr() {
return arr;
}
public void setArr(Object[] arr) {
this.arr = arr;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public Map getMap() {
return map;
}
public void setMap(Map map) {
this.map = map;
}
public Properties getPrpo() {
return prpo;
}
public void setPrpo(Properties prpo) {
this.prpo = prpo;
}
}