Spring（四）--bean的属性赋值 bean的属性赋值

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:c="http://www.springframework.org/schema/c"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--配置Grade对应的bean-->
    <bean >
        <!--01.设值注入   推荐使用    便于阅读
        <property name="id" value="1"/>
        <property name="gradeName" value="一年级"/>
        02. p命名空间注入
        p:id="1" p:gradeName="一年级"
        03.通过构造方法赋值    必须有对应的构造方法
           001.构造方法的参数下标来赋值
              <constructor-arg index="0" value="1"/>
              <constructor-arg index="1" value="一年级"/>
           002.构造方法的参数名称来赋值
           <constructor-arg name="id" value="1"/>
           <constructor-arg name="gradeName" value="一年级"/>
           003.按照默认顺序
             <constructor-arg  value="一年级"/>
             <constructor-arg value="1"/>
         04.使用c命名空间
        -->
    </bean>


  <!--配置 Student对应的bean-->
    <bean  >
        <property name="name" value="小黑"/> <!--普通属性-->
        <property name="grade" ref="grade"/><!--域属性-->
        <property name="names">
            <array> <!--数组-->
                <value>小黑1</value>
                <value>小黑2</value>
            </array>
        </property>
        <property name="list">
            <list><!--list集合-->
                <value>小黑1</value>
                <value>小黑2</value>
            </list>
        </property>
        <property name="set">
            <set><!--set集合-->
                <value>小黑1</value>
                <value>小黑2</value>
            </set>
        </property>
        <property name="map">
            <map><!--map集合-->
                <entry key="id" value="1"/>
                <entry key="name" value="小白"/>
                <entry key="address" value="海淀区"/>
            </map>
        </property>
        <property name="properties">
            <props><!--properties属性-->
                <prop key="id">1</prop>
                <prop key="name">小白</prop>
                <prop key="address">海淀区</prop>
            </props>
        </property>
    </bean>
</beans>

public class PropertyDemo {

    public static void main(String[] args) {
        ApplicationContext  context=new ClassPathXmlApplicationContext("spring.xml");
         Grade grade=  context.getBean("grade", Grade.class);
        System.out.println(grade);
    }
}