多种类型注入
CollectionBean与CarBean,省略setget以及toString方法
public class CollectionBean {
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 prop;//properties类型注入
}
public class Car {
private String name;
private String color;
}
获得容器:
public class Demo {
@Test
public void fun1(){
//1创建容器对象
ApplicationContext ac=new ClassPathXmlApplicationContext("cn/itheima/c_injection/applicationContext.xml");
//2向容器要User对象
User u = (User) ac.getBean("user");
//打印user对象
System.out.println(u);
}
@Test
public void fun2(){
//1创建容器对象
ApplicationContext ac=new ClassPathXmlApplicationContext("cn/itheima/c_injection/applicationContext.xml");
//2向容器要User对象
User u = (User) ac.getBean("user2");
//打印user对象
System.out.println(u);
}
@Test
public void fun3(){
//1创建容器对象
ApplicationContext ac=new ClassPathXmlApplicationContext("cn/itheima/c_injection/applicationContext.xml");
//2向容器要User对象
User u = (User) ac.getBean("user3");
//打印user对象
System.out.println(u);
}
@Test
public void fun4(){
//1创建容器对象
ApplicationContext ac=new ClassPathXmlApplicationContext("cn/itheima/c_injection/applicationContext.xml");
//2向容器要User对象
User u = (User) ac.getBean("user4");
//打印user对象
System.out.println(u);
}
@Test
public void fun5(){
//1创建容器对象
ApplicationContext ac=new ClassPathXmlApplicationContext("cn/itheima/c_injection/applicationContext.xml");
//2向容器要User对象
CollectionBean cb = (CollectionBean) ac.getBean("cb");
//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"
xmlns:p="http://www.springframework.org/schema/p"
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.itheima.bean.User">
<!-- 值类型注入: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属性 -->
<property name="car" ref="car"></property>
</bean>
<!-- 引用类型注入:将car对象配置到容器中 -->
<bean name="car" class="cn.itheima.bean.Car">
<property name="name" value="兰博基尼"></property>
<property name="color" value="黄色"></property>
</bean>
<!-- ============================================================================================ -->
<!-- 构造函数注入 -->
<bean name="user2" class="cn.itheima.bean.User">
<!-- name属性:构造函数的参数名 -->
<!-- index属性:构造函数的参数索引 -->
<!-- type属性:构造函数的参数类型 -->
<constructor-arg name="name" index="0" type="java.lang.Integer" value="999" ></constructor-arg>
<constructor-arg name="car" index="1" ref="car"></constructor-arg>
</bean>
<!-- ============================================================================================ -->
<!-- p名称空间注入,走set方法
1.导入p名称空间xmlns:p="http://www.springframework.org/schema/p"
2.使用p:属性完成注入
值类型:p:属性名="值"
对象类型:p:属性名-ref="bean名称"
-->
<bean name="user3" class="cn.itheima.bean.User" p:name="jack" p:age="20" p:car-ref="car">
</bean>
<!-- ============================================================================================ -->
<!--
spel注入:spring Expression language spring表达式语言
-->
<bean name="user4" class="cn.itheima.bean.User">
<property name="name" value="#{user.name}"></property>
<property name="age" value="#{user3.age}"></property>
<property name="car" ref="car"></property>
</bean>
<!-- ============================================================================================ -->
<!-- 复杂类型注入 -->
<bean name="cb" class="cn.itheima.c_injection.CollectionBean">
<!-- 如果数组中只准备注入一个值(对象),直接使用value|ref即可
<property name="arr" value="tom"></property>
-->
<!-- array注入,多个元素注入 -->
<property name="arr">
<array>
<value>tom</value>
<value>jerry</value>
<ref bean="user4"/>
</array>
</property>
<!-- 如果list中只准备注入一个值(对象),直接使用value|ref即可
<property name="list" value="jack"></property>
-->
<property name="list">
<list>
<value>jack</value>
<value>rose</value>
<ref bean="user3"/>
</list>
</property>
<!-- map类型注入 -->
<property name="map">
<map>
<entry key="url" value="jdbc:mysql:///crm"></entry>
<entry key="user" value-ref="user4"></entry>
<entry key-ref="user3" value-ref="user2"></entry>
</map>
</property>
<!-- propeties 类型注入 -->
<property name="prop">
<props>
<prop key="driverClass">com.jdbc.mysql.Driver</prop>
<prop key="userName">root</prop>
<prop key="password">1234</prop>
</props>
</property>
</bean>
</beans>