Spring学习日记03_IOC_属性注入_集合类型属性

Ioc操作Bean管理（xml注入集合属性）

1. 注入数组类型属性
2. 注入List集合类型属性
3. 注入Map集合类型属性

Stu类

public class Stu {
    //1. 数组类型属性
    private String[] courses;

    //2. List集合类型属性
    private List<String> list;

    //3. Map集合类型属性
    private Map<String,String> maps;

    //3. Set集合类型属性
    private Set<String> sets;

    public void setCourses(String[] courses) {
        this.courses = courses;
    }

    public void setList(List<String> list) {
        this.list = list;
    }

    public void setMaps(Map<String, String> maps) {
        this.maps = maps;
    }

    public void setSets(Set<String> sets) {
        this.sets = sets;
    }
}

xml

    <!--集合类型属性注入-->
    <bean id="stu" class="Spring.Ioc.Day04.collection.Stu">
        <!--数组-->
        <property name="courses" >
            <array>
                <value>java</value>
                <value>c++</value>
            </array>
        </property>
        <!--list-->
        <property name="list">
            <list>
                <value>1</value>
                <value>2</value>
            </list>
        </property>
        <!--Map-->
        <property name="maps">
            <map>
                <entry key="1" value="one"></entry>
                <entry key="2" value="two"></entry>
            </map>
        </property>
        <!--Set-->
        <property name="sets">
            <set>
                <value>mysql</value>
                <value>oracle</value>
            </set>
        </property>
    </bean>
</beans>

4. 在集合里面设置对象类型值

xml

    <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>
    </bean>

    <!--创建多个course对象-->
    <bean id="course1" class="Spring.Ioc.Day04.collection.Course">
        <property name="cname"  value="Spring"></property>
    </bean>
    <bean id="course2" class="Spring.Ioc.Day04.collection.Course">
        <property name="cname"  value="MVC"></property>
    </bean>

5. 把集合注入部分提取出来

• 在spring配置文件中引入名称空间util
• 使用util标签完成list集合注入提取

xml

<?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">

    <!--1 提取list集合类型属性注入-->
    <util:list id="bookList">
        <value>book1</value>
        <value>book2</value>
        <value>book3</value>
    </util:list>
    <!--2 提取list集合类型属性注入使用-->
    <bean id="book" class="Spring.Ioc.Day05.collection.book">
        <property name="list" ref="bookList"></property>
    </bean>
</beans>

book类

public class book {

    private List<String> list;

    public void setList(List<String> list) {
        this.list = list;
    }
    public void test(){
        System.out.println(list);
    }
}