IOC操作-bean管理之依赖注入（DI）之set注入-各种类型1. null值 2. 属性值包含特殊符号 3. Set

1. null值

<property name="address">
 <null/>
</property>

2. 属性值包含特殊符号

 1 把<>进行转义 &lt; &gt;
 2 把带特殊符号内容写到 CDATA
<property name="address">
 <value><![CDATA[<<南京>>]]></value>
</property>

3. Set

 <property name="sets">
 <set>
 <value>MySQL</value>
 <value>Redis</value>
 </set>
 </property>

4. Map

 <property name="maps">
 <map>
 <entry key="JAVA" value="java"></entry>
 <entry key="PHP" value="php"></entry>
 </map>
 </property>

5. List

第一种

<property name="list">
    <list>
        <value>张三</value>
        <value>小三</value>
    </list>
</property>

第二种引入util名称空间

<?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:p="http://www.springframework.org/schema/p"
 xmlns:util="http://www.springframework.org/schema/util"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd
 http://www.springframework.org/schema/util 
http://www.springframework.org/schema/util/spring-util.xsd">
    <util:list id="bookList">
         <value>易筋经</value>
         <value>九阴真经</value>
         <value>九阳神功</value>
    </util:list>
    <bean id="book" class="com.atguigu.spring5.collectiontype.Book">
     <property name="list" ref="bookList"></property>
    </bean>
</beans>

6. 数组

 <property name="courses">
 <array>
 <value>java 课程</value>
 <value>数据库课程</value>
 </array>
 </property>

7. 对象

<bean id="emp" class="com.atguigu.spring5.bean.Emp">
 <property name="ename" value="lucy"></property>
 <property name="gender" value="女"></property>
 <property name="dept" ref="dept"></property>
</bean>
<bean id="dept" class="com.atguigu.spring5.bean.Dept">
 <property name="dname" value="财务部"></property>
</bean>

    <bean id="user" class="com.zcy.www.entity.User" p:name="晚来微风" p:sex="男">
        <property name="course">
            <bean id="course" class="com.zcy.www.entity.Course">
                <constructor-arg name="name" value="c语言"></constructor-arg>
                <constructor-arg name="time" value="24"></constructor-arg>
            </bean>
        </property>
    </bean>

7. 对象集合

<bean id="course1" class="com.atguigu.spring5.collectiontype.Course">
 <property name="cname" value="Spring5 框架"></property>
</bean>
<bean id="course2" class="com.atguigu.spring5.collectiontype.Course">
 <property name="cname" value="MyBatis 框架"></property>
</bean>
<!--注入 list 集合类型，值是对象-->
<property name="courseList">
 <list>
 <ref bean="course1"></ref>
 <ref bean="course2"></ref>
 </list>
</property>